SJVAQS91: STATUS Messages: 10 Entries..

daily plot interpretation 
 
A few notes after generating plots for some of 192, and all of 193&194: 
 
temp profiles: drys just barely go unstable - all temps (except in canopy) 
               are within a .3 C range.  They may never have gone unstable on 193. 
               However, w't' does go positive during the morning on all days. 
 
               wets always change "stability".  Vapor flux is upwards, as expected. 
 
wind profiles: always monotonically increasing.  Lowest prop stalls early - we will 
               swap out the HC11 as per SRS's instructions tomorrow. 
 
sonics:        ati reads slightly lower than uw, even though it is higher.  This is 
               not good.   
 
               uw.eddy reads higher than uw.flux.  I suspect the crystal oscillator on 
               uw.eddy may have changed, since the speed of sound on this sonic has  
               been too high (indicating small transit time counts, and thus a clock 
               which is slow?)  This is consistant with the higher winds I'm seeing. 
               I'll test the oscillator with the scope soon. 
 
krypton:       calibration was changed about 21Z today - all prior data are off. 
 
infrared:      seems to misbehave during the heat of the day.  I think my latest shield 
               helps - we'll see tomorrow. 
 
               co2 flux changes sign during the night (plants respire), as it should. 
               Mean co2 appears to decrease during the night and increase during the 
               day, looking like a negative gain.  I don't understand how the flux can 
               appear to have the right sign, and the mean be different.  In an attempt 
               to solve this puzzle, I looked at spectra (thinking the low frequencies 
               - and the mean - might be contaminated with temperature).  This showed 
               good values (agreement between q with krypton and similarity between 
               co2 and h2o) at low frequencies.  (There definitely is white noise at 
               high frequencies, but it doesn't appear to effect the cospectrum much.) 
               Thus, the puzzle is unsolved.  I'm hoping to learn more when Ray Desjardins 
               brings along some co2 cylinders so we can do a rough calibration. 
 
fast Ts:       biases change with temperature, as observed in FLAT and ARM.  variances 
               are okay (I think - didn't really check them too much).  10m variance 
               is less than 5m, as expected. 
 
radiation:     seems okay.  net_canopy shows the effect of furrow shadowing.  t_surface 
               appears to be seeing both canopy and dirt, and fluctuates with the wind 
               blowing the canopy around.  This is consistant with results compared 
               with the twin otter overflight. 
 
winds:         mostly northerly - tendency to turn W during the night.  NEVER FROM 
               THE BACK OF THE TOWER - HURRAY!  Calms down during the night to 0.5-2, 
               late afternoon picks up to 5-8. 
 
soil probes:   seem okay. 
 

Tasks performed today: 
 
- Switched prop #10 (with HC11 #3?) into the lowest level - had to swap MC14490 
  chips to get it to go. 
 
- put a new 74HC74 in UW#2, to prevent the same speed of sound drift problems 
 
- wiggled connector on back of acc. sounder to get the signal back 
 
- resoldered (and still had to wiggle) transducer connector inside box on AT, UW#1. 
  Is spiking less now 
 
- rewired the conditional sampler so it gets power from the power supply at the 
  base of its tower.  I made up a VERY strange fork/pigtail connector assembly to 
  do this since we didn't have all of the appropriate connectors here. 
  
  Am running a test now to determine whether this helps the bag filling problem 
  which caused the down bag to be so full during the first test. 
 
 

SYSTEM STATUS 
 
	Arrived at about 15:00 gmt to find 
the disk had overflowed and archiving from 
cosmos had stopped. 
Killed some fills and restarted archiving on 
cosmos at about 15:25 gmt. 
 

SYSTEM STATUS: 
 
	Everything is up and running. The cron job 
we tryed to run early this morning, to do automatic 
archiving to tape, did not run. The script was not 
executable. Made script executable and it is running now. 
 
	Sonic on scalar tower looked good thru the night 
with a few spikes. 
 

SYSTEM STATUS: 
 
	The system is up and running. The auto 
archive ran ok last night. Dick Pearson should be 
out later today to work on the Ozone sensor. 
 
The 5m flux tower sonic, uw, had a number of spikes 
during the night. The 5m eddy sonic looked good with 
a few spikes. 
 
	Other sensors are running ok except for the 
ozone. 
 

SYSTEM STATUS: 
 
	System up and running. Auto_archive executed 
ok. There were 12 to 15 spikes on the eddy 5m sonic. 
The 5m flux sonic had a number of spikes. 
 
The .5m psyc looks good now. Will monitor thru the day. 
 

SYSTEM STATUS: 
 
	System is running. Both uw sonics looked 
good during the night. All other sensors look good. 
 

SYSTEM STATUS: 
 
	The system is up and running. There 
were no major catastrophes during the night. 
The eddy uw sonic looked good last night with 
very few spikes. The flux uw is still spiking 
alot. All other sensors look good. 
 
Dick Pearson turned off his ozone machine at 03:20 GMT. 
 

SYSTEM STATUS: 
 
	System is up and running. It appears we lost 
some data last night due to the disk filling up. The same 
thing happened yesterday around 13:00 gmt. Data did not 
started archiving again until 13:30 gmt when the bkfiles_kill 
routine ran. 
 

SYSTEM STATUS: 
 
	The system is up and running. 
Teardown will start today. Calibration 
files will be logged for tfast and sonic zeros.