IHOP02: LOG Messages: 9 Entries..

The surface roughness can be calculated, for neutral stability, as

zo = (z2-z1)/[exp(k*u2/ustar) - exp(k*u1/ustar)]

where z1,u1 are height and wind speed for the sonic anemometer, z2 and
u2 are for the propvane at 10m, k=0.4, and ustar is the friction
velocity measured by the sonic anemometer.  I calculated this for each
station for the duration of the project and found zo as the median
value within the stability range abs(3m/L) < 0.002, where L is the
Monin-Obukhov stability length calculated from ustar and 
measured by the sonic anemometer.

The derived values are:

site	zo (cm)
1	0.24
2	2.4
3	2.9
4	1.1
5	5.9
6	4.9
7	2.3
8	1.8
9	1.2

Note that zo for sites 5 and 6 include data from both before and after 
wheat harvest.
Note that site 6 was plowed on June 24, which would have reduced zo
to a value on the order of that for site 1.

The displacement height was first calculated from the wind profiles 
for neutral stability:

D = z1 - (z2-z1)/(exp((u2-u1)*k/ustar) - 1)

where z1,u1 are the height and wind speed for the sonic, z2 and u2 
are for the prop vane at 10 m, k=0.4, and ustar is the friction
velocity.  Unfortunately these values of D are unrealistic.  

As an alternative, the displacement height was determined as 2/3 
the height of the vegetation, using the periodic measurements made
by Joe, Josh and Heather.  For each site visit, I averaged all of
the available vegetation measurements at locations 1-11.  The results
are as follows:

#
# date (GMT)		displacement height
#		stns:	 1
2002 may 01 00:00:00  	0.0
2002 jun 30 00:00:00  	0.0
#		stns:	 2
2002 may 01 00:00:00  	0.07
2002 may 20 00:00:00  	0.07
2002 may 29 00:00:00  	0.08
2002 jun  8 00:00:00  	0.06
2002 jun 15 00:00:00  	0.09
2002 jun 27 00:00:00  	0.12
2002 jun 30 00:00:00  	0.12
#		stns:	 3
2002 may 01 00:00:00  	0.27
2002 may 21 00:00:00  	0.27
2002 may 29 00:00:00  	0.29
2002 jun  9 00:00:00  	0.23
2002 jun 17 00:00:00  	0.27
2002 jun 27 00:00:00  	0.29
2002 jun 30 00:00:00  	0.29
#		stns:	 4
2002 may 01 00:00:00  	0.11
2002 may 22 00:00:00  	0.11
2002 may 30 00:00:00  	0.14
2002 jun  6 00:00:00  	0.18
2002 jun 12 00:00:00  	0.16
2002 jun 23 00:00:00  	0.24
2002 jun 30 00:00:00  	0.24
#		stns:	 5
2002 may 01 00:00:00  	0.47
2002 may 22 00:00:00  	0.47
2002 may 28 00:00:00  	0.46
2002 jun 06 00:00:00  	0.45
2002 jun 12 00:00:00  	0.43
# harvest on June 20
2002 jun 20 10:00:00  	0.43
2002 jun 21 00:00:00  	0.16
#
2002 jun 24 00:00:00  	0.16
2002 jun 30 00:00:00  	0.16
#		stns:	 6
2002 may 01 00:00:00  	0.43
2002 may 17 00:00:00  	0.43
2002 may 26 00:00:00  	0.40
2002 jun 06 00:00:00  	0.41
# harvest on June 17
2002 jun 17 10:00:00  	0.41
2002 jun 18 00:00:00  	0.17
#
2002 jun 19 00:00:00  	0.17
# plowed on June 24
2002 jun 24 18:00:00  	0.17
2002 jun 24 21:20:00  	0.00
2002 jun 30 00:00:00  	0.00
#		stns:	 7
2002 may 01 00:00:00  	0.19
2002 may 25 00:00:00  	0.19
2002 jun 01 00:00:00  	0.23
2002 jun 15 00:00:00  	0.29
2002 jun 20 00:00:00  	0.31
2002 jun 30 00:00:00  	0.31
#		stns:	 8
2002 may 01 00:00:00  	0.17
2002 may 16 00:00:00  	0.17
2002 jun 01 00:00:00  	0.19
2002 jun 14 00:00:00  	0.24
2002 jun 20 00:00:00  	0.23
2002 jun 30 00:00:00  	0.23
#		stns:	 9
2002 may 01 00:00:00  	0.09
2002 may 16 00:00:00  	0.09
2002 jun 01 00:00:00  	0.15
2002 jun 14 00:00:00  	0.07
2002 jun 20 00:00:00  	0.21
2002 jun 30 00:00:00  	0.21

I can't find any way to recover the missing data at station 9,  on Jun 9.

I've added 5 hours to the time tags of all variables from 12:55 to 16:15 CDT,
so that they are now tagged as 17:55 to 21:15 CDT.

So now what we're missing is 12:45 to 17:50 CDT.

Gordon

See logbook entry 233.  TWH

Yesterday, we reset the GOES and RTC clocks on stations 7-9.  I must have done
something wrong (entered local time rather than GMT?) at 9, since the data from
yesterday from about 11-16 CDT appear to really be the data from 16-21 CDT
(5 hours different -- the difference between CDT and GMT).

The problem appears to have fixed itself at 21 CDT (02 Z).

9/30/02:  As near as I can tell from the data, the time offset error
began at 12:45 CDT (17:45 GMT) June 9 and was correct after 21:20 CDT
(02:20 GMT, June 10). TWH 

At several sites, especially s6 and also s5, there has been ongoing rain
indicated which we don't think can be real.  I've attached a plot showing
that for a 3-day period of clear skies over the entire state that accumulations
of up to 8mm of rain were indicated.  There doesn't appear to be a good
correlation with wind speed.  I would guess electronic noise is the source,
but haven't tried to isolate this.

On May 17, I contacted the land owners to give them our telephone
number.  I also requested the owners of the winter wheat sites,
5 and 6, to let us know when the wheat will be/is harvested.

Site 1: Talked to Brad Shultz and offered to move the power cable,
if necessary, when his renter planted milo at this site.  Brad did
not expect the power cable to be a problem.

Site 2: Left voice mail for Gary Tice

Site 3: Talked to Dwain McFarland's mother-in-law

Site 4: Left voice mail for Jeff Ryan.  He called back later that day.

Site 5: Sent email to Cleyon Yowell.  Offered to meet him at the site
for a tour and requested to be contacted re wheat harvest.

Site 6: Left voice mail for Ken Andra.  Saw him at the site May 18
and gave him url for web page.

Site 7: Talked to Nancy Wilson

Site 8: Talked to Mrs. Bannon May 19.

Site 9: Sent email to David Burdette

Joe and Josh		316-650-2900
Bob Conzemius		405-579-0873
Scott Richardson	405-641-0286

GPS reading from car at location roughly 30m north of pond which 
is south of site 9:

	37deg 24.306' N
	96deg 37.831' W

initial log file /net/aster/projects/IHOP02/logbook/tklog.log created by USER maclean