SHEBA: Site 1 Messages, 67 Entries..

The lid on sled-1 was caught by the wind which sprung the hinge.
This happened roughly on 10/7.
A rope or strap is now needed to hold it open.

The exhaust stack also had some of its inadequate rivets pop loose
although it seems to be holding OK.

BEWARE not to push it over and have it flop enough to smash it more.

Note the PVC insulation on the GPS cable for sled-1 cracked in the cold.
The sensor is still working.  This happened roughly 10/7.

Station 1 was setup today, Saturday 11-Oct-97.

It is approximately 1.5 miles north of the ship on smoothe ice at this time.
The weather held off nicely and stayed calm with thin high stratus cover
and temps in the -14 range.

TEG / Propane Status
	2 full bottles.

Gps Location:	75:24:21.48
		-144:33:32.09

Gill Sonic:  Carl Friehe's R2 sonisc s/n 112 (?i think) was installed

Compass/Gill Orientation:
	The physical alignment of the gill and the electronic compass both
	are pointing in the same direction: toward the mast as viewed from
	the hygrothermometer.   At the present time, this is looking pretty
	close to due west.
	Compass reading = 228.96
	Adjusted for Dec= 266.66  (ie declination = 38 which is consistent)

Station Orientation:
	The 4-component system is directly south of the station at the
	present time.  The sled is pointing towards the station and about
	10-m to the WSW.  The sun shadows will be longer from there but
	the scientific need is to obtain the maximum readings which will
	be more likely from due south.

Rad. Level: x=-.23, y=.1

Station 1 was setup with the sonic aligned parallel to the electronic compass
north, with the north position facing 'down the TRH xarm toward the tripod' and
90 CCW viewed from the top from the sonic xarm.

This configuration will cause excess wind obstruction from the sonic's mounting
arm and needs to be changed so that the north faces in the parallel direction
with the sonic xarm.

Station 1 visited today:
Asymmetric Gill sonic realigned to have 'north' pointing outward from the
boom arm per the standard installation technique.

3/31/99
This appears to have occurred at 22:00 GMT, Oct 15 - TWH

Station 1 visted:

Gill sonic realigned to point north.  (also logged elsewhere)
Sonic height remeasured.  (also logged elsewhere)	
Removed Sled TEG vent insulation
Downloaded local data
Improved trail marking.

Comments:
	Ice on domes for PSP-in/out, PYG-in
	Ice on inlet for TRH

  There are spikes on the TRH data. This occurs about
every 2 hours. It affects all data from the TRH.
At this point I have no idea why. So I decided to change the
data rate from the TRH to EVE, on station 1, to 2 seconds instead
of 1 second. After some time will check to see if we have any improvement.

  John lead the way out to station 1, Atlanta. We spent
time adding markers to the trail. At the site, a new configuration
was downloaded. Refer to message 57 for more information on the
new configuration.

  Jeff, Tanell, nad UI went out to station 1 late yesterday.
We added additional trail markers.

  Gordon and I went to Atlanta this morning to replace the
propane tanks, download a new config, and replace the ram
disk. We tryed cleaning the sonic but it did not help.
 The propane bottles were weighed when we got back. One
was 40 lbs the other was about 30 lbs.

  Jeff and I wen to Atlanta to change the TRH so that set
screws can be put into the coupler between the shield and
the electronics housing. All sensors were cleaned off.
  Temperature and RH look fine. The compass heading has shifted
about 3 degrees to the North. This could be due to the
necessity of pulling the compass off one unit then mounting
it on the other.

12/17 ~18:30gmt
	Attempted to reach Atlanta.  Pressure ridge that formed several days 
	ago about a half mile north of the ship had opened up to form 200' 
	lead, full of chunky ice.  Edges of lead by Atlanta route full of 
	large ice chunks, up to 6' wide.  Open water in middle of lead, 
	about 8' wide.  Pressure ridge remnants dwindle to the east, where 
	lead curves around to the south.  (It's probably the same lead 
	crossing the Baltimore route.)  It may be passable to the east after 
	the ice thickens.

12/17 ~22:30gmt
	Followed tiny pressure ridge few hundred yards to the west of the 
	ship to the north, where it joins the large lead that blocked the 
	Atlanta route.  Had hoped to find lead crossing there.  Found 
	less pressure blocks on edge of lead, but lead was 300' across, 
	without any chunky ice across its width.  No open water visible, 
	but too late in day to drill the lead and try to cross.  This was 
	just a scouting trip.

	Returned to ship, then headed out the Cleveland route to scout out 
	the first lead crossing.  Large lead was well frozen.  Small, more 
	recent lead had closed forming only slight pressure ridge.  Plan to 
	try to get to Cleveland tomorrow.

12/19 01:30gmt
	Turned on beacon at Atlanta for help in locating it on eventual 
visit.  Found out next day compass reading dropped 2.5 degrees at that 
moment.

12/23 ~20:00gmt
	Visited Atlanta.  Changed propane and Flashcard.
	Cleaned moderate frost off pyg.in and psp domes.  Pyg.out dome was 
frost free.
	Cleaned heavy frost off sonic by standing on ladder and brushing frost 
off with mitten.  Tried using fingers to melt off residual frost, but they 
actually seemed frost free at that point.
	Cleaned heavy frost off TRH inlet.  It had mostly occluded the intake 
tube opening.  Removed intake tube and examined temp and humidity sensors.  
They were frost free.

	To get to Atlanta, we followed the staked route to the CRREL site 
called Tuk (Tuktoyaktuk), followed the large lead/pressure ridge to the left 
(west) for a few hundred yards, crossed the frozen lead, then just headed 
straight for Atlanta's beacon.  (If it's dark, and lights are turned off, you 
can see Atlanta's beacon from the ship, even at ground level.)
	Relative to the ship's bow, Atlanta has shifted 30 degrees toward the 
rear of the ship.  Most, probably all, of this shift occured when the lead at 
Tuk opened up and the floes shifted.
	We crossed a small (1-2') pressure ridge trending NW-SE about 250' 
prior to reaching Atlanta.
	The route had a lot less sastrugi on it than the Baltimore route.
	A crescent moon shone over the ship as we worked.

	There are drifts 1-2.5' tall around the sled box, but there's enough 
wind scour around the box itself that the intake holes in the bottom of the 
box are clear.

1/3 ~20:30gmt
	Visited Atlanta.  Changed propane and flashcard.
	Changed TEG nozzle.  Old one appeared dirty.
	Pyg.out dome clear of frost.  Pyg.in dome frosted on downwind side.  
Cleaned this frost off.
	Cleaned out plug of frost over TRH inlet.
	Brushed and melted frost off sonic heads, using ladder.

	Turned off EVE to change flashcard.  Left EVE off while changing TEG 
nozzle.  When I turned EVE back on, the battery monitor/charger would not allow 
any current to go to load.  Waited about 20 minutes for TEG to bring up 
battery voltage which was just below 12V, but monitor still wouldn't allow a 
load.  Disconnected power to the monitor, then reconnected it.  The monitor 
LED's then showed green instead of red.  I then turned on EVE and the LED's 
switched to yellow, but kept supplying power.

1/15 ~20:00
	Visited Atlanta.  Changed propane and flashcard.
	Cleaned light frost from radiometer domes.
	Installed modified TRH and sonic with head heaters.  Downloaded new 
config.dat.
	TRH fan didn't go on at first.  Found bad wire and was able to move 
it so that the fan stayed on.  Will replace the TRH unit again on next visit.

	One person in the party thought they saw a bear coming towards us.  
A second person thought they saw something move as well.  But the Blue Eye 
Beam showed nothing but snow mounds.  A bear, or watery eyes?

	To get to Atlanta, we followed the original route for the first part 
of the trip, then followed a new, direct staked route put up recently by 
support personnel.
	No new leads or changes in snow conditions.

3/31/99
Changed site number from 4 to 1 - TWH

1/21 17:54
	Changed heaton to 600.  (10 minutes)
	Changed heatoff to 6600.  (110 minutes)

1/22 18:55gmt
	Turned Atlanta's sonic heaters off (heaton=0) due to drop in battery 
voltage.

1/24 00:05gmt
	Having trouble keeping sonic heaters turned off at Atlanta.  Set 
heaton=6 and heatoff=60000 at both Atlanta and Baltimore.

1/24 19:42gmt
	Set heaton=1 and heatoff=32000 at Atlanta.

Fuel:  Changed propane tanks, both quite light.  Tried to orient the tanks so 
that the safety valve points up.  With the current location of the bottles, 
the T configuration of the hoses and the configuration of bottle valves, this
is impossible.  The left bottle fitting points straight down in to the pvc
rail, with no room for a hose.  The right bottle can be oriented correctly,
but only by kinking the hose.  It might be possible to orient the bottles
correctly, by ending the pvc rails about 10inches from the end of the box and
moving the T further into the box or by adding right angle bends to the hoses.

Flash Card:  Changed.  Jan. 29 was missing on the card and no data received,
from 28 Jan 14:00 to 30 Jan 2:00.

Battery:  Changed.

TRH:  Moved from FLA to ATL to repair beacon.

Topology:  Dug sled out of 3 ft drift.  Packed drifts on site are oriented 
NW/SE of the sled and the 4-comp.  Lots of new loose snow on top of hard 
packed drifts. 2-3 ft drifts throughout the area oriented in different 
directions.  No new lead or ridge activity in the area.

TEG:  Tried to replace nozzle.  It would not unscrew with a reasonable 
amount of force.  Brought the burner assembly back to the ship to work on it.

Jeff:  At Atlanta, the nozzle would not come out.  The part it's screwed
into just kept turning instead.  I tried removing the two wingnuts holding
the end plate on.  One of them was galled and would not come off.  The
large wingnut holding the starting electrode in place will not budge.
        I removed the burner from the TEG and brought it back to the ship. 
I used a file and a nut splitter to remove the offending small wingnut. 
(I have no current need to remove the large wingnut, although the ceramic
tube surrounding the electrode is cracked inside the exhaust hole.) To get
the nozzle out, I had to mount the venturi tube in a lathe chuck and
tighten the chuck very hard.  I had already tried penetrating oil and a
torch to heat things up (not in that order), but that didn't help. 
Several machinist types here confer that stainless steel on stainless
steel is a recipe for galling, and once it starts, you're hosed. 
        The nozzle came out, having traded some of its threads for those
in the venturi tube.
        I cleaned the nozzle, with the ship's crew supplying some
industrial strength oven cleaner that they use on their boilers.  It's the
best method I've found so far, but still required some work with with a
fine wire, a dental pick, contact cleaner and a microscope.        
	I'm beginning to question the idea of cleaning the nozzles anyway.
Not just in terms of labor spent, but in terms of reusing stainless steel
threads.
        I've never tightened the nozzles into the burners with too much
force, but from now on, will use wrenches to tighten the fuel line to the
nozzle, but will only hand tighten the nozzles into the venturi tube.
Please send two 9/16" open end wrenches, one of which is the extra slim
variety.
        I screwed/jammed the cleaned galled nozzle back into the galled
venturi and will try to get it back out to Atlanta tomorrow.  Hopefully
that nozzle will last until the next flights.  Otherwise, Atlanta's a
goner.


Sonic:  Heads were mostly clean.  Heater tape shows some tendency to trap snow
where it does not conform to the head.  Medium rime on the sonic arms, not
interfering with the heads.

4-comp:  Incoming:  pyran light frost, pyrge very light frost on dome and
shield.  Outgoing:  pyran very light frost, pyrge clear.  Fan is the 4-port
model with only the pyrge.s connected.

T+G: ok.

Antenna/Modem:  ok.

Sled:  Box fan disconnected.

2/8 ~23:45
	Visited Atlanta to replace TEG burner that had been removed for repairs 
on 2/3.
	Replaced TEG burner.  Used rocket heater for about 2 minutes before its 
power cord broke off in the cold.  Got the TEG running anyway, but at first, 
liquid propane came out of the nozzle, which leaked out of the combustion 
chamber and caused flames on the outside of the combustion chamber.  
Eventually, everything heated up and the TEG started working normally.
	Very little frost on on instruments despite the cold.  Only a light 
frost on the up facing radiometer domes.  It was thin, hard frost and would 
not wipe off.
	Sonic heads looked clean.  TRH looked clean.
	Tested beacon after returning to ship.  It works now.

	To prepare for the trip, we first had to get the PAM sleds off the 
small floe containing the Blue Bayou where they were stranded.  This 
required using pick axes to cut a notch in a pressure ridge/lead.  The PAM 
sleds are now on the remaining large floe which contains the snowmobile 
garage, Florida and Atlanta.
	Cleveland and Baltimore are separated from the ship and the rest of 
camp by multiple nearby leads.
	There are at least 2 new cracks in the floe between Florida and 
Atlanta.

At ~1030 - 1130 AST Atlanta was visited.
Fresh snow. No significant lead activity or ridge formation

The TEG box was dug free of snow and the air holes in the base of the box
were reamed.
The propane was resupplied.
A new (Cleveland's burner with a cleaned nozzle) TEG burner was installed 
and a flash card replaced.

The sonic anemometer was inspected. Dispite the frost covering the sonic
assembly the tips of the transducers were clear of ice. The ends of the
transducers appeared as small black discs. I cleaned away the bulk frost.

The TRH was inspected. The fan was running and the intake was not blocked
by frost. I cleaned away frost from the intake tube.

The rad array was completely frosted over with frost on all four domes.
The frost was heavier on the top domes. The ventilator/heater on Atlanta
is a quad ducted single fan with a heater resister ahead of the fan. The 
two ducts to the sw radiometers were disconnected and the two ducts to the
lw radiometers were wrapped in yellow tape. The fan was running but on 
inspection of the radiometer ventilation slots there was no evidence that
any air was getting through. I cleaned the frost from the four domes using
hand warmth
From the evidence the ventilation is a complete failure

2/5 ~20:00 Visited Atlanaa.  Changed propane and flashcard.
	Changed TEG nozzle. Nozzle face was quite dirty.
	Removed light frost from sonic supports.  No frost on heads.
	Removed light frost plug from TRH intake.
	Removed radiometers and mount to bring into ship. The ventilation tubes are not quite long enough so that if all 4 are attached to the housing nipples, they're subject to falling off.  This is partly due to the fiberglass wrap around the corrugated tubes getting in the way.)
	Removed louver cover plate. Open slightly. Thoroughly dug out sled box and cleaned frost from bottom vent holes.
	Unable to use Rocky. TEG started right up after opening valve. Checked with Tony on ship to make sure Atlanata was running
	The route to Atlanta crosses 2-3 of fairly recent leads and 
pressure ridges.  None were all that difficult to navigate. Foggy off and
on during operations where we couldn't see the ship. Cleared up nicely for our
return trip. There were some very large chunks of ice pushed up on top of the ice on our way out. Jay, Jeff, Dan, and Pat (3 snow mobiles).

Between 130 - 1200 AKST, 9 Mar the radiometer array was reinstalled at Atlanta.
The radiometer housings had been milled with 2" x 2 1/2" rectangular holes and
Rotron fans afixed to the housings using juice container and duct tape.
The radiation shields with original width slots were used. Five inch long 2 1/2"square cowls were attached to the fan intakes (again fruit juice containers)
The platform was leveled to ~ 1 degree.

The four ventilator fans all ran, the TRH fan was running and the sonic
anemometer was frost free.

3/20 ~20:00 UTC Visited Atlanta.  
	Changed propane and flashcard.
	Changed TEG nozzle. Nozzle face was quite dirty.
	No frost on sonic heads
	Shoveled out snow, clean intake air holes

	Replaced Gill sonic with Fla ATI
	Cleaned radiometer of frozen mist on upwind side

3/31 ~22:00gmt
	Visited Atlanta.  Changed propane, nozzle and flashcard.
	Removed frost from upfacing PSP.  Other domes clear.
	No frost on sonic or TRH.
	TEG had stopped running.  Still don't know why.  Both tank valves 
open, but one tank still weighed 50#.
	TEG started right up after changing nozzle and tanks.

	Leveled 4-component with bubble level.

	Sled skis are frozen solid into overflow water turned to ice.
	New crack and small ridge 4' west of radiometers.  Overflow must have 
come up through here and flooded the T and G sensors, as  well as flooding 
the sled's skis.

	3" of fresh water ice in downhill side of sled box, under TEG.  Must be 
from melted snow that drifted in through the louvers, still open 1/8"   Could 
not get drain/vent holes unblocked of ice.  Will wait for TEG heat to thaw the 
ice, and will unblock holes on next visit.  Meanwhile, louvers and 
disconnected 3" PVC will provide ventilation.  Other 2 drain/vent holes in 
bottom of sled box are clear.

	Crossed half a dozen new cracks/ridges between the ship and Atlanta.  
New cracks/leads are no longer freezing thickly.

4/5 ~19:00gmt
	Cleaned frost off Florida's upward facing pyranometer.
	Unplugged drain hole beneath TEG to let out 3" of accumulated water.

4/6 ~18:30gmt
	Cleaned frost off Florida's upward facing pyranometer.
	Unplugged drain hole beneath TEG to let out 2" of accumulated water.

Atlanta Visit, 4/6/98 into 4/7

Sensor Status: All reporting
22:46 Z	cleaned half-dollar sized rime off upward looking SW.
00:00 Z radiometers leveled using bubble level
00:15 Z feathery rime removed from sonic V component

Exposure:
	Tsoil probe is about 2-3 feet horizontally from a crack in the ice.
	TEG box is about 30 feet from crack and there is about 4cm of slush
	under the box before solid ice.  Snow and water accumulated inside
	box blown in through louvered vent.  Jeff has been slowly draining,
	unable to chip out ice enough in drain today.
	Snow level up to tripod horizontal rails
	Photos taken but forgot to take exact vertical measurement from
	sonic.  Estimated to be 7.5 feet
	4-comp level is at about 5'8" to center of beam.

Logistics:
	PI's considering whether it is more valuable to retain the temporal
	continuity of this site and the examination of a slush component vs
	moving the station for logistical concerns.  The snow surrounding
	the box is about 2-3' deep and could present some difficulty when
	it is time to move.

	There are 4 small cracks (4-12") that have apparently expanded a bit
	since yesterday between Atlanta and the ship.

Other:	Amos and Andy mobile (Jim Maslanik and Bob Stone) radiometer system
	and snow/ice survey (Don Perovich) were also making measurements 
	around the vicinity of Atlanta.

During site visit on 4/6:

~00:15 2 Solar Panels installed.
	One on each side of box.  The box appears to be oriented roughly E-W
	so one will get minimal sun.   The other is facing relatively deep
	snow (2-3') in front of it but it should still get some decent exposure.
	Verified PV/cables.
	Only mounting arrangement of the panels and cabling will require that
	they are removed during transport because of clearance with outrigger
	brackets.  :-(   Fortunately very easy to do.
	Observed power monitoring system still providing reasonable values.
	(saw 'Vteg' w/ PC showing 16.7 during sunny period: good sign it's
	seeing the PV.  Stay tuned.

	Sled Venting:
	2" Cable access added to rear of box and about 1' from the floor.
	1 Solar Panel covering the louvered vent.
	Added 2" passive weather-head vent with heat motor to lid over
	TEG cooling fins.  Unable to fully tighten the PVC parts on this one.

4/11 7:35 AKDT
	Reset TRH heating cycle to on=1, off=1800
	Reason is to determine if that will clean up plot of iload_max
	which is showing the quick heater cycle as a pulse.
	Mostly that is a nusaince on the plot.

4/11 ~23:30gmt
	Height from snow surface to bottom of sonic boom: 7' 5".
	Sonic arm points 51 degrees east of north.
	TRH/compass arm points 145 degrees east of north.

	All domes were clean.
	Water inside sled box was frozen solid.

	3' wide lead about 150' east of site.
	Fresh soft snow several inches deep all around site.

Atlanta Visit 4/13 ~22:15- 4/14 00:15

	Replaced TEG:
		Installed old Clev. TEG.
		Atl. teg taken apart later: very fouled with oil.
		See note with previous comments on power system.
	Replaced Propane: 1 tank empty. 1 tank 5/6 full.
	TEG startup only via nap-gas torch.  2V battery had a
	bit of snow around it and sparking wasn't good.  Hope
	it keeps running and charges that. 
	ATI boom angle: 228 + ~23 decl. = 251 looking at front
		of ATI down boom.
	Did not swap flash card.

	NOTE: Sled almost covered by blowing snow.
		PV installed a few days ago covered.  Only
		decent air intake was top vent and cable inlet.
		Uncovered sled and
		chopped out fair amount of ice.  Ice inside box.
		Will need to move this sled before sink or swim
		as it warms.  Lead from a few days ago S. of
		station now snow covered small ridge about 20
		yds away running NW,SE
		Opened hole in bottom to drain any water.

Atlanta Visit:
	Dug out and repositioned sled with ablation shield of 3 4x8'
		sheets of ply beneath, then recovered ply with snow.
		New position will obscure sonic from ~350 true -335 true
		Placed on ice/snow interface ~2-2.5' below surface.

	Recovered Gill cable.
	ATI Boom Height =  89" from snow
		  angle =  49-deg magnetic
	TRH Boom   angle = 151-deg magnetic
	Radiometer height=  47" from snow
		   angle =  68-deg magnetic

	Need to return to set pentapod footpads on plywood or else
	they'll sink.  Very slushy.  Water oozing up from below
	PVC was down in 4-6" of ice.   Today was quite warm and
	the snow in places is appearing to really soften.

	Had to restart TEG by torch;  2V TEG battery may be 
	shot.

TWH changed Site number from 2 to 1 1/22/99

Atlanta Visit:
	Yesterday the sled was repositioned on an ablation shield.
	Today we unburied the pentapod and placed plywood under the
		footpads.  Leveling of the tripod was as close as
		we could make it under the circumstances.
		The Rad. boom is somewhat worse but were able to
		level with the Schwarz mount.
		4x4' sheets of ply under 2 legs to the N; 4x8 and 1 4x4
		are under the 3 'S' legs.
	Surface Sensors:
		Are clearly in the ice and slush and we did not dig them
		out.  We left the ~2' snow cover undisturbed over them but
		extracted the cable enough to make the change.
		The leg nearest the marked 'surface' sensor area was under
		about 2-3" of ice whereas the cable was under about 6-8"

	New position will obscure sonic from ~350 true -335 true

	After setting the pentapod, we reshot the ATI / TRH boom angles
	I did not reshoot the Rad boom and the discrepancies noted below
	must be reconciled by double double checking at next visit

			Yesterday (Ola) Today (jm)
	RAD Boom angle =		 50-deg mag (jm 4/21)
	ATI look to N. edge of sled =   332-deg mag (jm 4/21)
	ATI Boom angle =  49-deg mag	 53-deg mag
	TRH Boom angle = 151-deg mag	322-deg mag
		-----------------------------------
	ATI/TRH  Diff. =  78-deg	 91-deg		(for orientation.dat)

	Other:
~20Z		Rad - cleaned domes, frosted from freezing fog/mist.
~21Z		ATI - cleaned (will put in another note)
		TRH - Check against ETL hand-held (which is apparently
			inconsistent and usually high vs tower snsrs)
			NCAR = -9.65, 92.5%
			HandH= -9.3 , 85.6%
			held it adjacent to trh intake

TWH changed site number from 2 to 1, 1/22/99

Site Visit to Atl to 'plywood' protect pentapod:

~21Z	The ATI sonic had not shown 'flags' or heating cycles
	overnight despite that Fla/Sea (Gills) had and there
	was a pretty good freezing mist / super cooled fog.

	The ATI V transducer facing the wind was pretty well
	covered in rime and ice which had to be melted off
	by hand.  There was some other ice on the U component.
	Otherwise the 'W' looked OK.

TWH changed site number from 2 to 1, 1/22/99

4/21 ~18-20Z Atlanta Visited.

	Site has re-established itself nicely after we disturbed
	it during setup of ablation shields: blowing snow once again
	to the rescue.

	All Domes had ice, cleaned ~18:30Z

	Added:
		Wind Generator.
		SWin heater: 40-ohm (3x 13ohm)
		SWout heater: 40-ohm

	Angles checked:
		ATI to N. edge of Sled =  332-deg magnetic
		Rad boom = 50-deg magnetic

4/24 21:45-22:00
	Replaced Atlanta's EVE box with the spare EVE box, but still using 
Atlanta's A/D board since the spare didn't have an A/D board.
	John Militizer had already replaced the button battery in this spare 
EVE.

	No frost on any instruments.

	Dug out a fair bit of blown in snow from the upwind side of the 
sled box hole (in the snow).

1/28/99 Changed Site number from 4 to 1 - twh

4/25 ~17:15gmt
	Downloaded configuration 54 via RF to Atlanta.

Visited Atlanta 1800-1900 4/28/98 (All times GMT)

Changed propane and flash cards.
Dime size patch of frost on upward looking SW radiometer; cleaned.
Minor frost in T/RH intakes. No frost on sonics.

Calibration with Vaisalla "wand" place in T/RH intale tube.
Time: 1849
Tair (wand) = -21.4 C    (PAM was reading -21.2 at about this  time)
RH (wand)   = 76%

Just after we got to the site, a lead formed upwind ~70 m from the 
station.  By the time we left at 1900, the lead had grown to 30 m
width.  It was oriented NNE-SSW. There was some shear also, the 
far (East) side has also moved about 30 m south.  At 1900 the lead 
was 50% open water (no grease) and the rest was grease ice with a
few pancakes piling up on the downwind side.

Another group was at the site at ~2000.  They noted rime on the 
radiometers and cleaned.  They also cleaned them at ~2400.  
There may still be icing problems due to moisture from lead.

An aircraft (Canadian Convair 580) reported the lead had grown
to 300 m during overflight at ~ 0100 29 April. 

The effects of the lead are clearly seen in the RH and T trends,
which are enhanced at Atlanta compared to the other sites after 
1800. 

Jim Maslanik checked Atlanta on way to his experiment about 1900 GMT..
He noticed Polar Bear had knocked off TEG chimney.
He put it back on.
Must have happened in last 24 hours.
No other apparent damage.
Several bear sightings in last two days.

5/7 AKDT
	Visited Atlanta to install ground wire.
	Bear had toppled exhaust stack again.  Reassembled it.
	No frost on instruments.
	Checked 4 component levels.  Made minor adjustment.
	Rebooted until I could reach the flashcard, then copied ram data files 
to the flashdisk.  Then swapped the flashdisk with a new empty one.
	Installed ground wire with one end attached to the wind generator post. 
Drilled 2m deep hole in ice about 80' to the west.  Hit overflow slush, but 
did not penetrate through ice to sea water.  Drilled another hole through 
refrozen 1' lead that had opened/closed about 2 months ago.  This hole is 
about 40' west of the sled box.  Dropped stripped end of cable through to 
sea water.

	Small pockets of open water on large active lead few hundred feet 
east of Atlanta.

Changed the propane tanks, flash card and did not change the TEG nozzle.  The 
instruments looked clean and seemed to be working well. 

Tdry1 = -2.57	Tdry2=-2.95  RH= 79.83
Batt Voltage = 14.4
TEG = 19.19 but the meter in the box was almost straight up ( I think ~14.5 v)
Load= 2.120 A
charging 3.139 A  What can the battery handle?
  The wind generator was on about 98% of the time I was there. ( 45 minutes )
U=5.28,	V=0.53,  W=0.06
compass = 360.61 w/decl
sonic boom = 91 degrees w/decl

Now for one little problem.   When I got back to the ship I looked at the flash 
card on Rocky.  The last day written was on May 15 (Metppf.135), it should have 
been today May 26 (JD 146).  hummm...  The card was last switched on May 13 
(Metppf.133) so there was files for the rest of the 13th all of the 14th (~40KB) 
and about ~30KB of a day for the 15th.  I created a small text file on Rocky and 
saved it to D: ( flash card ) and it seemed to work fine.  I reformatted the 
card using MS Windoz.  Does it need to be initialized with some kind of PAM 
file??

The lead just east of the site is still active.

Later
I. C. Snow

Went to Atl to swap the flash card and move the WG from the 'SOLAR-IN' to the 
`EXT-BATT` connector.  The flash card had the correct number of days on it. :-)
Tdry	-0.24
Tdry2	-0.41
RH	90.86
Baro	1015.48

Batt	14.48
TEG	15.25
load	0.905
charge	1.547


The instruments looked and sounded good.
The lead to the east is still open and there were several cracks on the way to 
the site.

Davey Wavey

Went to Atl to check out why the data we the lost data link and the bear damage
from this mornings visit.  The bears ( mom and two little cubs ) stomped around 
quite a bit. Smelled everything them mom didn't like the smoke stack. I need
to bang out the dents, reassemble and reinstall.  The rest of the stuff looked
ok.  I think she was using the WG mast as a scratching post, too.

I plugged my buddy Rocky into eve got a prompt things looked good except the 
radiometers were all Nan.?  Checked the flash card and all the data was on the
card. So I stopped eve, swapped the flash, it started fine and all the reading 
looked good. Even the radiometers looked good.  There was about 2.5 inches of
water on the plywood.

I'll see you in the machine shop.

I. C. Water

Went to change the propane and flash card.  The system was down when I got
there. The LEDs on the Morningstar were flashing in sequence.  I checked the 
batt and it was running around ( I think ) ~ 20 volts. I checked things out. 
PV and TEG in 'solar-in' ~21 volts and the WG in 'ext-batt' like I left it.
But I don't remember adjusting the pot before switching it on June 1.  Now it
is adjusted to ~14.1 v and still plugged into ' ext-batt' .  On the ship I
plotted the batt/teg/spd from May 28 to June 9 to see if and when the WG was 
over charging the system. From the plot I noticed a gap at June 4 when
the wind was peaking.  Then again when the wind increased around June 6, this is
about the time the bear was playing the sled like a piano and the batt reading
seemed noisey after that. So I can't tell if the wind or the bear introduced
the noise into the system. 
 
Readings when I left:
batt	14.13v
TEG	14.13v
load	0.851a
charge	2.229a

Tonight on the ship the batt voltage looks clean and holding at 14.25v, iload
looks clean at 0.8a and icharge looks cleaner at 2.4a

The stack has been re-installed.

D. Costa

I went to check the TEG nozzle today, that's why there's a blip in the data.
The nozzle looked OK, just a tiny bit of black. I pulled a "clean" nozzle out 
of the clean nozzle bag and it looked like it had some kind of white-ish film
on the orifice.  I tried it anyway, it was in the "clean" bag.  As you might 
expect the propane didn't flow threw the nozzle so I put the old one back and
it fired up with the manual sparker.  The battery in the TEG was down to 0.9v.
I'll try to find a new one in the PAM room.  

I've been noticed the iload and icharge dropping very slowly.  Any thoughts?

We drilled a hole next to the sled to try and drain some of the water out. After
about 5 feet of ice we hit water and nothing happened. There's 3 inches of water
under the sled.

DaVe

I changed the TEG nozzle. The nozzle was a little bit dirty and I was trying
to fix the falling icharge and iload.

Heights

1.52 m	radiometer from the middle of the boom to the surface
2.39 m	sonic ( middle of the boom to surface )
1.43 m	end of TRH shield to surface 

91	compass ,  eve on ship  359.5 ( w/decl )

before I changed the nozzle
batt	14.26
teg	16.65
iload	0.696
icharge	1.865

~one min after I finished changing the nozzle ( the WG kicked in like it wasn't
regulating itself ( longer than normal ) then it kicked in )
batt	14.08
teg	16.59
iload	4.039
icharge	15.74

a couple of mins after I changed the nozzle
batt	14.26
teg	16.65
iload	0.696
icharge	1.865

DavE

I have been noticing current at Atl was slowly decreasing. Today I went to reset
the batt charger.  Things looked good when I arrived. BB LEDs charge and 
full batt.

batt	14.40
teg	17.07  light winds and lots of sun
iload	0.632
icharge	1.774

I tried to reset the charger by disconnecting the pos on the batt and nothing
happened.  BB LEDs charge and full batt.  I then removed the solar-in and ext-
batt and ran eve on the batt for a while.

batt	13.14
teg	00.00
iload	1.019  more normal
icharge	0.000

Then I tried to reset the charger again after letting things settle and the 
charger reset no problem.  

When I left ( after letting it settle again )

batt	13.78
teg	13.84
iload	0.978
icharge	2.957

It will be interesting to see if it holds, if not I will replace the batt.

Costa

I went to Atl changed of the propane, nozzle and flash card.  The instruments
looked clean. 

heights
251.0 cm	middle of the sonic boom to surface
160.5 cm	end of TRH shield to surface
172.5 cm	from middle of radiometer to surface

compass 95 degrees    Rocky 363.91  ( w/decl )

The TEG nozzle was clean but I switched it with a new one because I didn`t know
when it would be serviced again.

The flash card had the correct days on it ( 160 - 173 ).

Mr. Coster

At 1614, we checked the levels at Atlanta with the same bubble level as as Florida. We leveled the radiometers and discovered that the electronic level
showed Xlevel=-0.90 and Ylevel=0.22 with the bubble level exactly flat.
We decided to set the levels according to the electronic one
Xlevel=0.01 (1/3 bubble off) and Ylevel=0.05 (1/10 bubble).

Salutations

Visited Atlanta at 1820 UTC 980706

Changed propane tanks and flashcard.

Heights:  Sonic-snow surface: 277 cm
          Downward-looking radiometer domes to snow surface: 166 cm

Orientations:  Radiation arm: 272 deg T (22 deg declination)
               T/RH/Compass arm: 174 deg T
               Sonic arm: 82 deg T
               Sled from sonic: 355-004 deg T

Radiometers were clean.  Radiometer levels were still within 1 deg of optimal, 
but they were leveled with the bubble level anyways.  Splus shows an improvement in the levels. 

Tsoil sensor in water 20 cm below surface.  It does not appear to be getting 
solar radiation, as it has no "groove" in the ice like the one at Fla did.  
Could not see the heat flux plate, so did nothing with either one.

General conditions:  Melting has been strong for the past month, and yesterday 
it rained moderately for 19 hours (20-25 mm accumulation at the met tower), and last night it cleared up and refroze.  So, the surface at ATlanta was hard, 
crusty snow.  The wooden sled platform is sitting in a sled-induced meltpond, 
but the top of the wood is mostly dry.  The sled is well above the water.  The 
Atlanta lead runs WNW-ESE and is located 91 paces (meters?) along 30 deg true 
from the Atlanta sonic.  The "lead" is currently a wide area (> 100 m) of open 
water, ice floes, and ice/snow slurry, all intermixed.  Very confusing.

Photographs were taken of the Atlanta site and the Atlanta lead.

Site visit Alanta

	Fixed problem with flash card.  All else is well.

Site visit Atlanta -- July 21, 1998, 1845-1945 UTC
Moderate-dense fog, light-moderate wind.

	Put 6x6 supports under sled plywood base, which is in a meltpond.  
Moved sled a little to the east on plywood to level the sled better.  There is 
a narrow ice hummock under the plywood causing a bulge in it.  All sled skis areout of the water.

Both the Gsoil and Tsoil are in cavities under the ice/snow.  The Tsoil cavity 
is waterfilled, though the Gsoil cavity may not be.  Tsoil sensor displaced and then replaced in its cavity.  Uncertain whether Gsoil sensor level or not since the plate isn't visible (probably unlikely considering that the other sites havefrequently been tilted, but it was decided not to disturb it. Photos taken of 
Tsoil and Gsoil cavities.

The radiometers had fog/water drops on all domes, with more on the upward 
facing ones.  Radiometers were cleaned and leveled.  Note that there is still coarse-grained snow under the radiometers and not ice.  This makes the albedo somewhat unrepresentative of the area (e.g., higher than surrounding area).  
Photographs taken of the site.

The sonics had duct tape flaps hanging from the heads and flapping at about 1-2 Hz in the wind(the tape holding the heaters on).  Uncertain whether this would affect the data, but the flaps were trimmed off and water/fog drops were wiped 
off the heads.  Photo taken of sonic heads before duct tape trimmed.

Propane tanks and flashcard were swapped.

Heights:
              Sonic arm centerline to ice surface: 287 cm
              Downward looking radiometer domes to ice surface: 187 cm

Orientations: Sonic arm: 80 deg T (22.5 deg decl.)
              Compass arm: 350 deg T
              Radiometer arm: 270 deg T
NOTE: Kerry made these measurements with the handheld compass.  We found out a 
few days earlier that something in Ola's clothing (the bib overalls?) may 
affect his compass readings.

Probably last time this site will be visited by snowmobile.  Going through 
meltponds is too rough on the machines (and people).

Site visit Alanta -- July 24, 1998

	Leveled Alanta Radiometer.  Teg box on slight tilt.  Plan is to
stake box in same way that Florida is staked.  Probably trip to Alanta
tomorrow.


Update -- July 26, 1998

	Atempt to visit Alanta and Stake teg box aborted by increasing
melt ponds, making it imposible to get to by snowmobile.  May attempt by
Helo later this week.

Site visit Atlanta -- July 28, 1998, 22-23 UTC
Overcast, some sleet, snow.  Moderate - strong wind.

Raised plywood sled platform further out of meltpond and leveled it by putting 
6x6 and 4x4's under one corner.  Anchored sled by tying it to a post put into 
the ice.

Both the Gsoil and Tsoil are under the ice and are not visible. 
Leveled radiometers-only minor adjustment needed.

Site visit Atlanta -- August 3, 1998, 1400 - 1530 local
Overcast, light-moderate wind, temperature -0.1.

	Supports under sled box are doing fine.

	 Radiometers were cleaned and leveled.  

	Propane tanks, nozzle, and flashcard were swapped.

Heights:
              Sonic arm centerline to ice surface: 292 cm
              Downward looking radiometer domes to ice surface: 197 cm

Orientations: Sonic arm: 75 deg T (compass set at 22.5 deg decl.)
              Compass arm: 165 deg T
              Radiometer arm: 255 deg T

Site visit Atlanta -- August 8, 1998, 1900 - 2000 local
Fog, light-moderate wind, temperature +0.1.

	Alanta has been transmitting TRH003 line back to ship continously.
Rebooted EVE.  Alanta began to transmit normally.  Checked Flash card and`
found that flash card files for jd 218,219,220, and 221 were missing. Copied
these files from eve to the flash card.  Changed flash card.

	Temperature check with visallia temperature wand.  Hand held reports
temperature of .2C  RH = 92.7.  Alanta shows t = .23, t2 = .10, and RH = 100.23.

Changed the propane and flash card ( JD 221 - 227 ) 

The melt ponds were 3/4 covered with ice and the surface area was 45% melt
ponds.  I could see a little open water in the Atl lead.
The upward looking SW radiometer was 40% covered with 2mm of clear ice.
The Tsoil probe was dug out and placed on the surface.

We looked at the sonic and couldn't get any good data out of the V axis.  This 
would explain the huge amount of heating cycles at Alt. I did
a quick visual on all the connectors and they looked good.  I could hear that
all the heads were producing the "sonic buzz".  I tried it with the heaters
unplugged, no luck. We brought the sonic in for a better look in the PAM room.
It's one of the new ones (S/N 980202), the book states "the Sonic Anemometer/
Thermometer is quite reliable on its own ..." and the other good quote  
is "The transducers in the lastest instrument are NOT field replaceable."

We probably took the last snow machine ride to Atl, this season.

I M PAM

The spare Gill was installed ( 8/24/98 )  1315 hours.  Config 52 was 
downloaded but how do I check to make sure it has the new and improved
Gill software, like the Fla Gill?  
The Gill is mounted very close to the mast and I need to bring out the Gill
size boom extention. Does anybody know where one was last seen?  I checked out
the PAM room and a quick search on deck, but no luck yet. Also, it 
was mounted with the North arrow 30 degrees CCW to the boom.
The "SHEBA PAM Operators Guide" said the usual mounting 
orientation of the Gill sonic on the PAM station is with the "N" arrow 
parallel to the sonic boom.  I looked at the mounting bracket at Fla today
and saw that only one screw is necessary to hold the bottom of the Gill
in place.  The data needs a 30 degree correction until I can get back 
out there and rotate it. 
The ponds where covered with ice and I moved the sled about a foot higher on
the ablation shield.

D. Costa 

I was able to stop by Alt on the way back from Maui and align the N arrow
with the boom.  The N arrow now points straight out from the boom. I haven't
found any of the Gill sonic booms.  The screws didn't line up on the bottom
bracket so the top clamp and the edge of the bottom bracket are
the only things holding it on.  This Gill is "Symetric" and the one at Fla
is "Asymetric".

Silly Gilly 

Peter and I took the helo to service Atl.  The extention boom was installed 
on the Gill.  The flash card and propane were changed. 

The melt ponds around the sled were 100% covered with ice and snow.
The snow/ice was slushy today.  Some open water 100 m to NNE.
Radiometers were clean.

heights
297 cm	middle of the sonic boom to surface
357 cm	Gill sensor center to surface
230 cm	middle of the TRH boom to surface
187 cm	bottom of TRH shield to surface
208 cm	middle of the rad boom to surface of the snow

compass
295.44 raw,  325.94 w/decl  Rocky
24  magnetic ( by hand )

The flash card did not have the correct number of days on it. Parts of 227, 228
and 236 only.

Mr PAM

	Sat Sep 12 1998
					
Ed and Scott visited Atlanta for a routine propane swap. 
All went well. We also swapped Flash cards.
Rocky's monitor became impossible to read in a very short time.
The sled is unlevel and hence the wind generator appears to work
only during strong winds. It is tilted so the heavy front end points
down and it take strong winds to overcome this tilt and spin it.

It appears that within a week or two, enough of the path to Atlanta
will be frozen that it can be removed with a snow machine.

Atlanta`s compass is pointing at 319 degrees magnetic.

Bear tracks all around the station,including right under the radiometers.
Evidently the same bear that visited Maui 3 days ago visited here first.

	Since Atlanta is only about 300 m from Maui, when Scott and I
finished our Maui visit, we had the helicopter drop us off at Atlanta.
	We leveled the wind generator better.
	I measured the compass direction as 314 deg magnetic.  Rocky also
gave 314 deg.  Thus, an erroneous compass offset cannot explain the the
discrepancies in wind direction I mentioned in the Daily_Status report.
	Atlanta has a symmetric Gill sonic with, I presume, an orientation
arrow at the very top.  We did not want to take the sonic down to look and
alter the data record, and we could not get high enough to look down from the
top.  So we'll leave the sonic, possibly misoriented, and try to remember
to check it's orientation when we disaasemble the station.

		9/23/98
		
At about 6am AKDT we lost comms with Atl. Pampoll was checked and
found to be alive and working. We could communicate with Florida.
After observing the recent plots for Atl using iplot() it was 
decided that the site was probably running but not communicating.
Voltages and currents were OK, although it was apparent the
sonic heaters were running constantly for hours, producing large 
spikes in much of the data.

We decided to go ahead and do the propane, flash card and TEG nozzle
service on ATL since it was due Sat 9/26. Ed and Scott made their 
first snowmobile excursion to Atlanta. The P,F,T swaps went fine but 
the system would not ignite. There was no spark at the ignitor. We 
wound up using the butane torch to light the system manually.

The problem with the radio is a mystery. When we arrived, the clear
to send light was flashing. When we connected Rocky and attempted
to communicate we got a message, "Unable to connect, auxillary console
in use". Powering down and back up solved this problem and the
comms problem as well.

Note: After returning to Shebop and attempting to FLASH the card, there
was one day of data on it, day 255, (today is JD 266). I dont know what
happened,and thought the system would not run without writing to the card.
????  ideas anyone...    Thank you and have a good day SA

John, Tom, Dean and Andreas Plough(?) visited Atlanta this morning to
dismantle the site.  The system was shut down, apparently because the
battery voltage was too low.  As a consequence, the sonic, radiometers,
and hygrothermometer intake were all iced.  The sonic was heavily rimed;
the radiometers were partially rimed although the incoming SW radiometer
had heavy rime with the radiation shield completely covered.  Around
10:30 am local time, John shut down the station.

We measured various parameters:
Height of upwelling radiation shields	191 cm
Height of hygrothermometer intake	169 cm
Height of sonic boom (center)	     	273 cm

The sled was oriented in line with the mast, about 20 ft away at
azimuth 340 magnetic.  Looking toward the mast, the hygrothermometer
boom was at 310 mag (pointing toward the SE); the radiometer boom 
was at 225-180=45 magnetic (pointing toward the SW); and the sonic 
boom was at 42+180=222 magnetic (pointing toward the NE).

The sonic was serial number 0067 (symmetric).
The Campbell data logger box was number 1.

Logbook	Date	Site	Comment highlight(s)
Entry	(local)

31	oct 11	1	Setup 1.5 mile N of ship (Friehe R2 sonic sn 112?)
40	oct 15	all	Sonic hts tabulated (345-348 cm to center of array)
38	oct 16 	1	Reoriented Gill w/ `N' along boom
54	oct 20	1	New stn config
69	oct 23	1	Marked trail
75	oct 24	1	New stn config
97	oct 29	1	Changed TRH, compass reading shifted

115	nov 6	1	Routine maintenance
122	nov 13	1	Routine maintenance, new fan and heater
124	nov 18	1	Routine maintenance; heavy riming

135	dec 4	1	Routine maintenance
167	dec 23	1	Routine maintenance; heavy riming

187	jan 3	1	Routine maintenance
217	jan 15	1	Installed Fla sonic/TRH (R2A 0087)

242	feb 2	1	TRH moved from Fla to Atl; removed TEG burner
249	feb 8	1	Replaced TEG burner
274	feb 22	1	Routine maintenance

299	mar 5	1	Removed radiometers; light frost noted
308	mar 9	1	Installed modified rad array
328	mar 20	1	Replaced Gill w/ ATI from Fla
346	mar 31	1	Routine maintenance; leveled radiometers

365	apr 7	1	Installed PV panels
384	apr 11	1	Routine; hts and azimuths measured
386	apr 11	1,2,4	Sonic heights tabulated
389	apr 13	1	Installed refurbished? Cle TEG
402	apr 17	1	Moved sled; measured hts and azimuths
404	apr 18	1	Releveled tripod/radiometers; more hts and azimuths
414	apr 22	1	Installed wind generator, SW heaters;
422	apr 24	1	Replaced EVE with spare
			documented exposure
434	apr 28	1	Routine maintenance

451	may 7	1	Routine maintenance
480	may 21	1,2,4	Rime check; minimal riming found
481	may 22	1	Measured hts and azimuths
487	may 26	1	Routine maintenance; measured azimuths
495	may 30	all	Tabulation of site characteristics in late May
497	may 31	1	Routine maintenance

510	jun 5	1	Routine maintenance
519	jun 10	1	Routine maintenance
523	jun 11	1	Routine maintenance
526	jun 12	1	Measured heights, azimuth
531	jun 14	1	Routine maintenance
539	jun 18	1	Moved sled?
546	jun 22	1	Measured heights
556	jun 27	1	Leveled radiometers
562	jun 30	all	Comparison of bubble & electronic levels

570	jul 6	1	Measured heights, azimuths
580	jul 14	1	Routine maintenance
592	jul 21	1	Leveled radiometers; measured heights and azimuths;
			trimmed tape on sonic transducers
598	jul 24	1	Leveled radiometers	
603	jul 28	1	Ablation mitigation

613	aug 4	all	Tabulated offsets of electronic levels
614	aug 3	1	Routine maintenance; measured hts and azimuths
622	aug 8	1	Rebooted EVE
635	aug 15	1	Repositioned Tsoil; removed sonic (980202) for service
651	aug 24	1	Installed symmetric Gill sonic w/N 30 deg CCW to boom
654	aug 26	1	Rotated Gill N to align w/boom;
			note that Fla Gill is asymmetric
659	aug 29	1	Routine maintenance; measured hts and azimuths;
			added Gill boom extension

683	sep 12	1	Routine maintenance; measured compass bearing
693	sep 16	1	Leveled wind generator; measured compass bearing
708	sep 23	1	Routine maintenance
713	sep 28	all	Summary of site characteristics
717	sep 30	1	Decommisioned Atlanta; measured hts and azimuths
720     oct 1   1,4     Comment on Tsoil, Gsoil sensors at Fla and Atl

Note that `Routine' Maintenance is often more than refueling, swapping
flash card, and de-riming sensors. However, here I am focusing mainly on
sensor maintenance.