CHATS: rad_soil Messages: 26 Entries..

PAR sensor heights:

11.42m
 8.03m
 5.07m
 2.11m

These are heights to the top of the railroad ties.
Add 0.3m to those for actual height. 

Gordon fiddled with logger connections for rad.16m around 11:40(?)

Tcase.out.16m has been intermittently bad since perhaps May 6.

Cleaned all sawhorse radiometers, 14:55 - 14:56

31may07  tower climbed 11:42-12:18

~12:10 cleaned the 4-comp radiometers.  I had done this yesterday but
was unable to reach the down looking longwave.   Decided to re-clean
all today.   There was no dirt evident on any of the 4 sensors.

The rad stand battery was swapped.   The one removed was at ~12.1.

31may07  9:20 LT

Trime Measurements:
'embedded-probes' = 31.6%	15-TDR
'temporary-probe' = 23.3%	15-TDR

Gravimetric sample, and 'temporary trime' probe sample, were from closer
to where our installed sensors are.   This area visually appeared more
representative of the surface moisture level than where the 'embedded-trime'
probes are where the top looks dry.

Tin weight: 8.0g, but the weights shown are after 'tare'
         Before baking  After baking
           Weight         Weight      delta   Estimate of % water by mass
0-3 cm:     91.5g          74.6g     16.9g    delta/91.5  = 18.5%
3-6 cm:    113.5g          94.3g     18.2g    delta/113.5 = 16.0%

Cooking start: 10:00 31 May
          end: xx:xx  x Jun
        Total: x days y hr


Note: It has been a few days since the last watering on 26May, so this 
should be one of the more moist conditions.

Note: The 0-3cm sample was not a perfect volumetric fit in the disk.
A sliver on top wasn't filled so thus the noticable difference in weights.

30may07 

12:30-12:38 LT the sawhorse radiometers were cleaned.
	Note there was quite a bit of filth on the uplooking
	sensors, especially the rnet.

15:20-15:35 LT tower climbed and 4-comp rad cleaned as
	best i could.   There wasn't a significant amount
	of dirt.
	Note I was unable to reach the outside, downlooking
	long-wave without an extension.

	Today we were having good south winds so decided
	to not go back up the tower.

28may07	16:00-18:00 LT tower climbed

PAR sensor installed
Lower data sys re-start (adn/aup) 1834-1835LT.
PAR data incoming.on lower ttyS19 (low.xml only)
low.xml is changed on aster but not run through new ops yet.

The ACD Apogee PAR sensors and Licor LI190 were installed
at levels: 2.5m, 5m, 8m, 11.5m (licor).
The 2.5m sensor is 'in the clear' at the bottom of the canopy,
the 5m sensor is actually inside some branches, while the
8m is at the top of the canopy and will have minimal shading.
The licor is above the canopy.
I hand leveled the sensors as best possible.

NOTE Re Calibrations:
The nominal calibration provided by Apogee was clearly not
consistent with the observed test.   The pars have a potentiometer
inside the sensor which is factory adjusted to uniform setting
of 5.0umol/(s m^2) per mV.       

A POST-PROJECT 'CALIBRATION' RUN SHOULD BE DONE to improve
upon and verfily what was done prior to putting them on the tower:

-------------------------------------------------------------

The Test run on 27may07 consisted of mote output from the par strings,
with the following output.   Note that the naming here is equivalent to
what we put up on the tower.
             PAR.2.5m       PAR.5m         PAR.8m         PAR.11.5m
			Apogee
chan		raw	   vdc     raw    vdc     raw    vdc     raw    vdc
19:08:39   6670  0.10422  3945  0.06164  6568  0.10262   175  0.00136

Output 57600,n,8,1


Chan 1	gain 4	ADC 0=0x48 SE-1	Wand-1 Apogee
Chan 2	gain 4	ADC 0=0x48 SE-2	Wand-2 Apogee (This one doesn't have diffusers)
Chan 3	gain 4	ADC 0=0x48 SE-3	Wand-3 Apogee
Chan 4	gain 8	ADC 2=0x4C SE-1	Licor

NOTE Re Cleaning:
	I did not do any special cleaning before this test. 
	The intention was to get it out to see 'order of magnitude'
	so that we could decide whether to proceed on the tower or not
	The Apogee 'quantum' manual for the LQS50-6 does not mention
	what to use.   They had appeared clean visually.
	After the test and before putting on the tower I did clean
	with distilled h2o because there was some dust on them from
	overnight and 'car' traffic.

DATA FILES:  RAW
	/media/isff2/projects/CHATS/parsensors/parTestNight1.cap
	/media/isff2/projects/CHATS/parsensors/parTestDay1.cap

EXCEL FILES:
	/media/isff2/projects/CHATS/parsensors/parTestNightDCbias.xls
	/media/isff2/projects/CHATS/parsensors/parTestDay1-1.xls

	These guys are the raw data with some graphs added.
	In the second worksheet of 'day1-1' is a crude 'scalar'
	that can be used to semi-normalize the data to allow you
	a relative micromol/(s m^2) level based upon the voltages
	output and read by the pars.
	Clearly there is a slight shift in the 'scalars' through
	the day.   The average multiplier to normalize the licor
	voltage to the wand readings for the day is shown below,
	plus the 'calibration' into micro-mols / (s M^2)

	Simplistic GAIN
	PAR.11.5m =	PAR4, licor, * 263.635213   = micro-mols
	PAR.8m    = PAR3 / 40.9949 * 263.635213 = micro-mols (* 6.430927)
	PAR.5m    = PAR2 / 26.4434 * 263.635213 = micro-mols (* 9.969793)
	PAR.2.5m  = PAR1 / 43.8834 * 263.635213 = micro-mols (* 6.007630)

	From the 'Night' file a nominal dc-voltage-offset is shown below.

	Simple OFFSET
	PAR.11.5m = PAR4 = .000317	(adc0-1)
	PAR.8m    = PAR3 = .000947	(adc0-2)
	PAR.5m    = PAR2 = .0009	(adc0-3)
	PAR.2.5m  = PAR1 = .000948	(adc2-1)

-----------------------------------------------------------------
Licor:	s/n 11264

	Nominal Calibration using 2290S mV adaptor:
	(8.9microA/1000umol*s-1*m-2) * 1A / 10+6microA * 604 Ohms =
	
	mult=-159.24	umol*s-1*m-2 per microA
	tcoff=.0036
	9feb07

Here is the cal info on the Licor 11264
multiplier        cal constant           604 ohm adapter        cal factor
umol/(s*m2)/uA    uA/1000 umol /(s*m2)   mV/1000 umol /(s*m2)   1000 umol /(s*m2)/mV
-159.24           6.28                   3.79312                0.263635213

The units we put data out in for the Quantum is umols/sm2.
So with the 604 ohm adapter you should use the calibration factor 263.635213


-----------------------------------------------------------------

PAR sensor placement was begun 12:45LT through 13:30LT with tower climbing. 3
or 4 sensors will be mounted oriented toward the SE or SW depending on mounting.

More analysis of the Rlw plots shows that for a number of weeks at least that
the Rlw web plots differ from the S-plots on Aster. The S plots are much 
smoother and physically realistic and so believe the web plots are accessing
something incorrectly to create a jittery plot. Will look at from hotel where
internet is more amenable.

Summary: Not likely to be a problem with the sensor.

Solution: Tom fixed this problem by adjusting rad.q. It turns out that the 
K&Z at .16m was using Eppley equations resulting in the funky behavior.

21may07 ~11:40  branches cut

These were 'encroaching' the Rnet to within an inch or so.
It could have hit the sensor already, or at some point
although there was no damage.

The 16m rlw.out is much higher than previous values the last two days. 
Investigating.

18may07  10:50

Trime Measurements:
'embedded-probes' = 32.1%	30-TDR
'temporary-probe' = 22.8%	31-TDR

took gravimetric, however, difficult soil.

Tin weight: 8.0g
         Before baking  After baking
         Weight w/ tin  Weight w/ tin            Estimate of % water by mass
0-3 cm:     75.4g          71.15g      -4.25g     4.25/(71.15-8.0) =  6.73
3-6 cm:     98.5g          88.25g     -10.25g    10.25/(88.25-8.0) = 12.77

Cooking start: 1610 17 May
          end: 1240 20 May
        Total: 2 days 20.5 hr


Note: it has been many days since the last rain/watering.
Will take another reading after the next watering.

the rad stand was fixed by Hanza on friday Apr 27th by running wire from the
large battery, directly to the datalogger.
data started flowing.

I cleaned the 16m radiometers from 1413-1417.  Sky was clear, so it should be
possible to see the effect.  There was a bit of obvious dust on the up-lookers.
As far as I know, this is the first time cleaning these sensors.

The boom was seated on only one side of the clamp, which made me nervous.  It
was redeployed using both sides.

I've set up the corer to take 0-3 and 3-6cm cores.  I'm processing the entire 
3cm-thick core as one "aloquot".  I've been turning the oven off between 
samples.

4/9:
This should be considered close to the driest case.  The soil crumbled out of
the corer on my first try.  I undercut the corer with the trowel and tilted
it out of the hole to recover the final core.  Nevertheless, the clay-like
clumps do have some internal adhesion.

I got "bad TDR level" on the TRIME when using the normal probe at 1 location.
I then tried the removable probe and got a reading of 17.4-18.0%.
I then moved the removable to another site and got the 23.4% noted below.
Thus, I'm worried about the soil salinity -- we'll have to watch it.

NOTE!!! I left the removable probes in the 23.4 location.  Future readings
should use these.  They are about 2m to the South and slightly West of the
fixed soil probe stake (with the orange flagging).

4/12:
Slightly moister upper layer after 1mm of rain.  Still a lot of variability 
in TRIME readings, even using prongs that have had a lot of time to settle.  
Actual readings were: 24.1, 25.0, 26.1, 24.7.  
Some of the core dirt pushed out of 0-3 and also there was some spillage.  
Thus 0-3 probably is 0-3.6, 3-6 is 3.6-6.6cm.  I wouldn't use this 0-3 for 
density.

4/15:
Morning after irrigation AND rain, so probably the wettest it is going to get!
0-3 was not quite deep enough, so don't know about bulk density.
TRIME was reasonably consistent: 34.4, 34.6, 34.7.

Date	Time	TRIME	0-3 Wet	0-3 Dry	%	3-6 Wet	3-6 Dry	%	
4/9	07:30	23.4	79.9	74.7	7.0	98.3	88.5	11.1
4/12	11:45	25.0	126.8	117.6	7.8	92.9	83.2	11.7
4/15	09:00	34.6	84.0	61.9	26.3	123.2	97.2	21.1

The radiometers just west of the 30 meter tower where cleaned today after the Saturday morning tree spraying.

The radiometers have been subjected to dust clouds due to mulching and mowing
since about 15:00.  Don and Keith cleaned radiometers and 1.5 m kh2o.

Steve and Ned completed installation of the surface radiometers around
17:25 PDT, March 25.

I have calculated the footprint for a downward looking radiometer:

The footprint is h^2/(r^2 + h^2)^2 where h is the height of the radiometer
and r is radial distance on the surface from a point immediately below
the radiometer.  Thus the footprint has a maximum directly below the 
radiometer equal to 1/h^2, drops to 0.5/h^2 at r/h ~ 0.6, 0.25 at
r = 1, and 0.01 at r=3.

The cumulative footprint is r^2/(r^2 + h^2).  The cumulative footprint
equals 0.5 at r/h = 1, 0.9 at r/h = 3, and 0.99 at r/h = 10.

Moved 4 component radiation to NW face of tower, so that the boom is now 
pointing to ~210 degrees.

The height of the top of boom is 15.67+0.32 = 15.99m

Steve started zigbee radio for radiation stand.  Only have soil sensors at this
time.

Installed 4-comp radiation at 15.69 (top of boom) + 0.32 = 16.01 m agl

boom is pointing to ~150 degrees.

I installed the soil sensors at a depth of 5 cm, south of the sawhorse and at
the boundary between bare ground and clover.  See previous logbook entry for
discussion of surface types. They are close to being directly west of a tree.

I installed the soil heat flux plate at 5 cm with the dot on top.  I installed 
the ECH2O and TPO1 sensors with a vertical orientation to avoid blocking 
vertical water migration.  I installed the soil temperature probe at a
45 degree angle starting near the surface.

The serial numbers are:

HFT	14983123	38.2 W/m^2 per V
Qsoil	No serial number
TPO1	200239		175.8 uV/degK
Soil T	STP 94017

The radiation sawhorse has been installed at the 30 m tower.  It is
located one tree row north and 3 rows west of the tower.
  
There are two distinct types of surfaces.  The surface between the trees in
a  N/S row is bare ground.  The surface between the N/S tree rows has a
ground cover of clover.  I oriented the sawhorse in a N/S direction and
aligned the horizontal beam along a border between clover and bare ground
in order to sample equally both types of surface.  

The height of the middle of the horizontal sawhorse beam is 2 m +/- a few 
centimeters.  It is 120 cm west of the tree line and centered N/S between
two trees.