SJVAQS91: FAST Messages: 13 Entries..

krypton calibration change 
 
Path length for q_h20_uv.5m changed from 1.005 
to 1.008. 
 
 

krypton clibration changed 
 
Determined that calibration function for the krypton hygrometer has been 
wrong; we were assuming a 5v offset and a gain of 2. Turns out that 
the actual adam offset is 0 and gain is 1. Created a new calibration 
function q_kh20_2a.c which assumes gain = 1 and offset = 0. 
 
Restarted covar with the new calibration. Previous covar output for 
q_h2o_uv.5m and all associated covariances will be wrong. Raw  
archive data will be okay. 
 
 

Fast T reinstalled 
 
I had removed it for the ozone balloon-bursting timing tests.  It is 
back in. (5m.uw.eddy).  The balloon tests took about 1/2hour. 
 
 

t.10m.ati replaced 
 
We also did a calibration, saved as: 
/home/aster/projects/SJVAQS91/cals/tfast_10m.205 
with switches every 5 seconds between zero, operate, and +5C cal. 
The final Fluke reading was 30.2C - the fast T was reading about 
2C higher. 
 
 

The heat flux on the scalar flux tower looks 
anomolously large this afternoon.  This appears 
to be caused by larger temperature fluctuations 
at the scalar flux tower than at the momentum 
flux tower.  Is this caused by the clutter of 
sensors and shelters at the scalar flux tower?? 
 
 

Have noted that 5m eddy fast T has a greater 
variance during the day than the 5 m flux fast 
T for the past few days.  This also appears in 
the heat fluxes. 
 
Noted then that the flux fast T had a 1 deg C 
increase around 2100 on day 205.  Steve is 
doing a calibration on that sensor. 
 
5 m flux fast T is now reading 1.8 deg C higher 
than the chamber reference, and the 5 m eddy 
fast T is reading 0.9 deg C higher. 
 
We put the chamber on both sensors and recorded 
data in the operate, calibrate, and zero  
modes.  The data are in the directory  projects/ 
SJVAQS91/cals in files tfast_flux5m.280 and  
tfast_eddy5m.280.  The gain of the flux fast T 
is approximately 5.05 and that of the eddy fast T 
is approximately 5.02 (analyze calibration data 
files for better accuracy).  These calibrations 
occured between 1800 and 1900. 
 
 
 

Moved 10m fast T down to 5m on flux tower 
in order to compare with others at 5m. 
10m fast T was down from 2250 to 2400 GMT. 
 
After moving the 10m fast T we did another 
calibration on it.  It was reading ~1.9 deg 
C higher than the chamber reference.  We  
also did a gain check, putting the data into 
projects/SJVAQS91/cals/tfast_10ma5m.208. 
The gain appeared to be ~5.05; analyze the 
data file for a more accurate value. 
 
 

Replaced transducer on t.5m.uw.fx.  The 
data were looking very flaky, with large 
excursions about twice per day.  Looking 
at the old transducer, it appears that the 
platinum wire could have been intermittently 
touching the supporting framework. 
 
Replacement occurred ~1830 gmt.  Performed 
calibration with new transducer;  data are 
in projects/SJVAQS91/cals/tfast_5mflux.211. 
The mean temperature reads about 2.8 deg C 
lower than the chamber reference. 
 
 

T fast work: 
 
	The bridge for the 5m.uw.fx t fast 
was removed and looked at. The connector from 
the transducer to the bridge circuit board was 
loose. After fixing the bridge was re-installed. 
This event took place from 00:20 to 01:00 GMT. 
 

The 5m uw fast T has not been drifting 
as wildly since the connector in the bridge 
was fixed on JD 213 at 0100.  This appears 
to have cured that problem. 
 
 

The 5m uw fast T on the eddy tower still 
appears to have a larger covariance than 
the 5 m uw fast T on the flux tower and 
the 10 m ati fast T that was moved down 
to 5 m.  They appear to agree at night, 
but to disagree during the day.  We are 
moving the 10 m ati fast T over to the 
eddy tower since it has agreed quite well 
with the 5 m uw eddy fast T since Steve 
fixed the connector in its bridge. 
 
Moved the 10m ati T from 1700 to 1900, 
then calibrated from 1900 to 1925. 
When the chamber reference reads 31.6 
the probe reads 36.0.  Calibration  
data collected in projects/.../results/ 
tfast_10ma5m.216. 
 
Calibrated the 5 m uw flux T fromm 
1925 to 2015. 
When the chamber reference reads 27.3 
the probe reads 23.5.  Calibration  
data collected in projects/.../results/ 
tfast_flux5m.216. 
 
Accidently removed the tfast_flux5m.216 
file!! 
 
 

FAST TEMPERATURE CALIBS 
 
The SJVAQS91 record was searched for the fast temp calibrations. 
The cross reference directories were: 
				     the logbook 
				     /SJVAQS91/cals 
 
The following were found in /cal . The appropriate logbook entry is  
added if available 
 
File name            Logbook entry        Time and date of calibration 
tfast_10m.205        82                   before 17:36:30    24 JUL 91 
tfast_10m.dat 
tfast_10ma5m.208     113                  before 00:24:36    28 JUL 91 
tfast_10ma5m.216     149                  19:00 - 19:25      04 AUG 91 
tfast_5m.dat 
tfast_5mflux.211    121                  ~ 18:00            30 JUL 91 
tfast_eddy5m.208 
tfast_flux5m.208 
tfasted_5m.dat 
 
The following are only refered to in the logbook and are not in /cal 
File name            Logbook entry        Time and date of calibration 
tfast_flux5m.216     149                  19:25 - 20:15      04 AUG 91 
tfast_eddy5m.280     108                  18:00 - 19:00      27 JUL 91 
tfast_flux5m.280     108                  18:00 - 19:00      27 JUL 
 
These files were cp to yield their equivalents 
     tfast_10m.205.ed 
which had been processed to remove superfluous :250 
     vi tfast_10m.205.ed 
     :1,$s/:250// 
They were then examined with Splus 
     cd $ASTER 
     Splus 
     fastt <- scan("tfast_10mm.250.ed") 
     X11() 
     plot(seq(along=fastt),fastt,ylim=c(30,45)) 
Non essential data points including operate - calibrate transients were removed. 
     vi tfast_10m.205.ed 
The calibration offset function was then performed on the cleaned files to 
yield the offsets, average, and standard deviation. 
     fastt <- scan("tfast_10mm.250.ed") 
     fun.fastT.cal(fastt,10) 
 
The results of the operation is given: 
 
File name            Logbook entry        Time and date of calibration 
 
tfast_10m.205        82                   before 17:36:30    24 JUL 91 
             Results: 
		     offsets  -5.020000 
                               5.012727 
			      -5.026364 
                               5.014545 
                     average   5.018409 
		     st dev    0.006137766 
 
tfast_10m.dat 
             Results: 
		     offsets  -5.019091 
			       5.01181 
		              -5.021818 
			       5.012727 
                     average   5.016364 
		     st dev    0.004867387 
 
 
tfast_10ma5m.208     113                  before 00:24:36    28 JUL 91 
             Results: 
		     offsets  -5.050909 
			       5.036364 
			      -5.041818 
			       5.033636 
                              -5.042727 
                     average   5.041091 
		     st dev    0.006661844 
 
 
tfast_10ma5m.216     149                  19:00 - 19:25      04 AUG 91 
             Results: 
		     offsets  -4.967273 
			       4.969091 
			      -4.975455 
			       4.969091 
			      -4.972727 
			       4.970909 
                     average   4.970758 
		     st dev    0.002955128 
 
 
tfast_5m.dat 
             Results: 
		     offsets  -4.992727 
			       4.991818 
                              -4.993636 
			       4.990909 
			      -4.999091 
			       4.993636 
                     average   4.993636 
		     st dev    0.003214122 
 
 
tfast_5mflux.211    121                  ~ 18:00            30 JUL 91 
             Results: 
		     offsets  -5.045455 
			       5.042727 
			      -5.042727 
			       5.048182 
			      -5.042727 
			       5.042727 
                     average   5.044091 
		     st dev    0.0022818 
 
 
tfast_eddy5m.208 
             Results: 
		     offsets  -4.975455 
			       4.971818 
			      -4.979091 
			       4.971818 
			      -4.984545 
                     average   4.976545 
		     st dev    0.005393599 
 
 
tfast_flux5m.208 
             Results: 
		     offsets  -5.038182 
			       5.044545 
			      -5.035455 
			       5.039091 
			      -5.033636 
			       5.043636 
			      -5.037273 
			       5.040909 
                     average   5.039091 
		     st dev    0.003795321 
 
 
tfasted_5m.dat 
             Results: 
		     offsets   4.993636 
			      -5.000909 
			       5.000000 
	                      -4.998182 
                     average   4.998182 
		     st dev    0.003235478 
 
 
 

FAST TEMPERATURE CALIBRATION HISTORY 
 
The SJVAQS91 record was searched for the fast temp calibrations. 
The cross reference directories were: 
				     the logbook 
				     /SJVAQS91/cals 
 
The following files were found in /cal . The appropriate logbook entry is  
added if available and if not then imagination was used.  
 
File name         Logbook  Time and date of calibration 
 
tfast_10m.dat     None     probably at startup of ops 
tfast_5m.dat      None     probably at startup of ops 
tfasted_5m.dat    None     probably at startup of ops 
tfast_10m.205     82       before 17:36:30  24 JUL 91 
tfast_eddy5m.208  108      18:00 - 19:00    27 JUL 91 
tfast_flux5m.208  108      18:00 - 19:00    27 JUL 91 
tfast_10ma5m.208  113      before 00:24:36  28 JUL 91 
tfast_5mflux.211  121      ~ 18:00          30 JUL 91 
tfast_10ma5m.216  149      19:00 - 19:25    04 AUG 91 
 
The following are only refered to in the logbook and are not in /cal 
 
File name         Logbook  Time and date of calibration 
 
tfast_flux5m.216  149      19:25 - 20:15    04 AUG 91 
 
The calibration offset function was then performed on the cleaned files to 
yield the offsets, average, and standard deviation. 
The results of the operation is given: 
 
File name         Location         Time and date               Average    Gain 
                  of sensor        of calibration              offset     factor 
 
tfast_10m.dat     Flux twr 10m     probably at startup of ops  5.016364   0.9967 
tfast_5m.dat      Flux twr  5m     probably at startup of ops  4.993636   1.0013 
tfasted_5m.dat    Eddy twr  5m     probably at startup of ops  4.998182   1.0004 
tfast_10m.205     Flux twr 10m     before 17:36:30  24 JUL 91  5.018409   0.9963 
tfast_eddy5m.208  Eddy twr  5m     18:00 - 19:00    27 JUL 91  4.976545   1.0047 
tfast_flux5m.208  Flux twr  5m     18:00 - 19:00    27 JUL 91  5.039091   0.9922 
tfast_10ma5m.208  Flux twr 10m     before 00:24:36  28 JUL 91  5.041091   0.9919 
                   moved to 5m 
tfast_5mflux.211  Flux twr  5m     ~18:00           30 JUL 91  5.044091   0.9903 
tfast_10ma5m.216  Flux twr 10m     19:00 - 19:25    04 AUG 91  4.970758   1.0059 
                   moved to 5m 
 
 
Note that the gain factors are all extremely small and hence can be ignored.