- 264: Radiation, Site 2, Thu 20-Jun-2002 07:59:19 CDT, Rnet Coef Change on 6/18
06/18/02 ~18:05 Local
Rnet Coef. Changed per values shown on the Q7 s/n 91090:
Was: Up=9.35 Down=11.55
Now: Up=8.57 Down=10.53
The Q7 had been replaced on 6/13, 17:45 but the old coefficients
were still being used. Now they're OK and the post processing
adjustment can be confined to the approp. window; ie
6/13 22:45 - 6/18 23:00
Note: the coef. took effect at the 'reboot' time of ~23:05Z
Note: Tony recorded the new s/n as 91096 and I wrote down 91090
He might be correct because it was a little hard to see
this so it'd be a good idea to confirm it during teardown.
SEE also: entry 244
See also entry 102. The "now" coefficients above correspond to
those for Rnet 91096, which I removed from site 8 on 5/19/02. TWH
- 250: Radiation, Site none, Sun 16-Jun-2002 10:30:53 CDT, Net Radiometer Q99258 repaired
The net radiometer Q99258, which had been removed from site 2 on 13 Jun''02,
was repaired and replaced in the spare sensor pool.
The upper dome had been dimpled by heavy rain or hail. It was replaced with
a new dome from the cache of net radiometer domes in the base.
- 249: Radiation, Site all, Sat 15-Jun-2002 16:05:45 CDT, Sun shadow tests
Sun shadow tests were carried out on all incoming short-wave radiometers
and low-wave radiometers. Using a ~5 cm Al foil disc mounted on a 30 cm rod
the shadow of the sun was imposed upon the radiometer disc. This prevented
the contribution of direct solar radiation but only slightly impeded the
contribution of the full sky radiation.
While the tests were being carried out, the data system was set to acquire
5 second data. This data was captured in a designared file.
The shadow was held on the short-wave radiometer disc for 60 seconds and then
while the short-wave radiometer recovered the shadow was held on the long-wave
radiometer disc. The procedure was repeated several times.
The tests were carried out when there was clear sky. Some of the following tests
were under non-ideal conditions
Site 1: Thu, at 17:00 - 17:30, 6 Jun''02, s1l.020606 clear sky
Site 2: Thu, at 18:30 - 18:50, 6 Jun''02, STEVE O? clear sky
Site 3: Fri, at 10:10 - 10:30, 7 Jun''02, STEVE O? clear sky
Site 4: Fri, at 16:20 - 16:40, 7 Jun''02, STEVE O? clear sky
Site 5: Fri, at 16:50 - 17:00, 7 Jun''02, STEVE O? clear sky
Site 6: Fri, at 17:50 - 18:00, 7 Jun''02, STEVE O? clear sky
Site 7: Sat, at 13:15 - 13:25, 8 Jun''02, s7l.020608 sky somewhat cloudy
Site 8: Sat, at 14:10 - 14:20, 8 Jun''02, STEVE O? not a clear sky
Site 9: Sat, at 15:30 - 15:50, 8 Jun''02, STEVE O? scattered clouds, no good
Site 7: Sat, at 10:20 - 10:30, 15 Jun''02, s7l.020615 thin high cirrus
Site 8: Sat, at 11:10 - 11:20, 15 Jun''02, s8l.020615 thin high cirus
Site 9: Sat, at 12:10 - 12:20, 15 Jun''02, STEVE O? thin high cirrus
- 216: Radiation, Site , Fri 07-Jun-2002 21:54:06 CDT, Summary of radiometer cals
We know from EBEX and others that we need to check the PIRs for their response
to short-wave radiation. Wim has said that the way to do this is to shade each
PIR in clear-sky conditions along with a PSP. The PSP data show the change
in Rsw.in by the shading object and the PIR data show the response (pile,
Tdome, and possibly Tcase).
With only one "shader" (made of foil and cable ties), we alternately shade the
PSP and the PIR. We have played with several cycling times: 30s and 60s,
sometimes with an additional 60s in between.
Steve Semmer created a "mode 3" program
for this purpose which causes the CR10 to output continuous radiation data
from the CR10s (as opposed to normal operation with the CR10 accumulating
5-minute averages and also outputting soil data). At some stations, it
is possible to collect these data through EVE using "talk", at others, it
is necessary to direct-connect to the CR10 (using a cable which Steve made
for this purpose). This cable works best in the "old" mode (with the CR10
getting power through the AMP-9 connector), so I temporarily converted back
to "old" mode at one or two sites just for this test. The data themselves
are collected using the "logging" capability of "minicom".
We discovered a small bug in the CR10 program in this mode which made the
Tdome and Tcase valued offscale. Thus, we changed coefficients for these
channels to be linear with a gain of 1 and just collect them in mV.
Since the sky was clear the last 2 days, we just did this test at sites 1,3
yesterday and 2,4,5,6 today.
NOTE At several of the four component sites, I have found spiders living
inside the ventilator housings. They emerge and sit atop the dome. At site
1 I took a photo of such a spider. When threatened it moved inside and then
returned to its perch after a minute or so.
- 160: Radiation, Site 1, Wed 29-May-2002 12:39:07 CDT, screws tightened
Josh just called to let us know that he is at site 1 and has just tightened all the terminal block screws in our logger box. He said that two "purple wires"
were at bit loose. We'll have to see if this improves the Rsw.out data.
P.S. The data from Rsw.out is even worse now. Thus, this fix did not work. The
next step apparently is to swap out radiometers. (We brought spares with us,
but might not have calibrations for them -- I'll have to check this.)
- 102: Radiation, Site 8, Mon 20-May-2002 09:20:51 CDT, Replaced net radiometer at site 8
Replaced net radiometer Q91096 (cracked upper dome) with Q97034
(s/n from box, forgot to read it on sensor). Changed logger
coefficients from (8.57,10.53) to (9.21,11.37) per calibration
values on new radiometer.
Note (7/23/02): Checked net radiometer coefficients and found that
(9.21,11.37) correspond to Q97034. TWH
- 73: Radiation, Site 3, Thu 16-May-2002 09:43:21 CDT, Corrected Pyrgeometer, pyranometer coefficients
checked logger coefficients at site 3
two were wrong:
E-29136 PYGIN 02 259.50 corrected to 230.95
E-26226 PSPIN 04 80.257 corrected to 118.20
correction was done May 12, during the site visit, sometime between
12:50 and 13:50. From a plot of Rsw.in, I'd guess that the
change happened sometime during the break in the data from 13:00 to 13:30 CDT
7/29/02: Logger coefficients at locations 51 and 53 were the correct
values at the end of the project, suggesting that these were also
changed on May 12. See logbook entry 16. TWH
- 48: Radiation, Site 5, Sat 11-May-2002 16:50:39 CDT, Changed radiometer coefficient at station 5
Compared logger coefficients at Site 5 to those listed in logbook entry 18.
Those for PYGIN and PSPIN were incorrect and were changed as follows
Sensor Logger coefficient Old New
PYGIN 02 & 51 259.5 286.533
PYGOUT 04 & 53 80.257 110.254
It appears that this change was made around 1945 GMT, since the logger
data quit at that time. SRS suspects that he forgot to restart the
logger after talking with it via the console port.
5/12/02, 3:50 pm CDT:
Steve returned to the site last night at restarted the logger. TWH
Note (7/16/02): Logger coefficient 04 corresponds to PSPIN and site 5
only had incoming radiometers, so the entries in the table above most
likely correspond to PYGIN (02) and PSPIN (04), as noted in the
preceding comment, rather than PYGIN and PYGOUT as listed. TWH
- 44: Radiation, Site 9, Sat 11-May-2002 08:47:04 CDT, Changed PSP in/out and PYG out coefficients
Rsw.in/out have been reading high, so we checked the coefficients
in the logger program.
The coefficients for PYGOUT, PSPIN and PSPOUT did not agree
with the correct values - see logbook entry #22. We changed
the following coefficients to their new values, at about 15:30 CDT, May 10.
old new
PYGIN 259.5 259.605
PYGOUT 259.5 280.859
PSPIN 80.257 44.053
PSPOUT 80.256 51.177
Checked other coefficients from Q7 down to A0 of Tsoil, and
all were correct.
Note that we did not change the second values for the PYG and PSPs that
are used in the shading program.
7/29/02: The post-project values of the logger coefficients in the
shading program were
51 +259.50
52 +0.0000
53 +80.257
54 +0.0000
See logbook entry 22. TWH