GRW/MWR/M1 - Loose mirror

The data from the MWR were suspicious and became progressively worse. The problem was 
traced back to the fact that the screw that keeps the mirror in place had become loose and 
the mirror was freely rotating. 

The mirror was tightened on 6/9/2009, however the measurements were noisy until 6/16, when 
the instrument was rebooted and all the connections checked. 

Measurements between 5/1 and 6/9 should not be used. Data between 6/9 and 6/16 are usable, 
although they are very noisy.

• Mean 31.4 GHz sky brightness temperature(tbsky31)
• sky23
• bbn23
• Total water vapor along LOS path(vap)
• bb31
• bb23
• 23.8 GHz sky brightness temperature(tbsky23)
• bbn31
• Water, liquid, total along line-of-sight path(liq)
• sky31

GRW/MWR/M1 - Reprocessed: Biased LWP retrievals-Updated retrieval coefficients

Retrieval coefficients were updated to screen for some bad soundings.

Data were reprocessed 20100507.

• Water, liquid, total along line-of-sight path(liq)

GRW/MWR/M1 - Incorrect ambient temperature

The ambient temperature readings are incorrect.  Problem appeared to have started around 
10:48 GMT on 02/09, but was not really noticeable until slightly after 11 GMT, when tkair 
values dipped considerably.  

The dewblower was replaced on 2/11 and temperature readings returned to normal.

• tkair

GRW/MWR/M1 - Incorrect instrument computer set-up

Starting late on 07/11 the instrument began to have very brief (< 1 min) data outages 
every few hours.  By 07/12 data had become noticeably incorrect, particularly the PWV, LWP, 
TB23, and TB31.  At ~17 Z on 0713 the missing data / no data available flags became more 
frequent.

The problem was identified as improper settings of the instrument computer and was solved 
on 8/9.

• Mean 31.4 GHz sky brightness temperature(tbsky31)
• tnd_nom23
• Total water vapor along LOS path(vap)
• tnd31
• 23.8 GHz sky brightness temperature(tbsky23)
• tnd23
• Water, liquid, total along line-of-sight path(liq)
• tc23
• tnd_nom31
• tc31

GRW/MWR/M1 - Erratic brightness temperature

Around 12 Z on 7/20 both the PWV and 23.8 GHz brightness temp values began to diverge from 
those of the MWRP. By 7/22 both the LWP and 31.4 GHz brightness temp had followed suit. 
At 0600 Z on 7/22 multiple (10-20), brief (<=1 min) data outages began appearing hourly.  
The problem persisted intermittently until 8/9.

On 8/9, changes in the settings of the computer restored the proper functionality of the 
MWR software.

• Mean 31.4 GHz sky brightness temperature(tbsky31)
• tnd_nom23
• Total water vapor along LOS path(vap)
• tnd31
• 23.8 GHz sky brightness temperature(tbsky23)
• tnd23
• Water, liquid, total along line-of-sight path(liq)
• tc23
• tnd_nom31
• tc31

GRW/MWR/M1 - Missing data

Data are missing and unrecoverable.

• sky23
• wet_window
• tknd
• tnd31
• Sky infrared temperature(sky_ir_temp)
• bbn31
• Water, liquid, total along line-of-sight path(liq)
• tnd_nom31
• tkxc
• East longitude(lon)
• tkair
• tnd_nom23
• time
• 23.8 GHz sky brightness temperature(tbsky23)
• bb23
• tc23
• base_time
• bbn23
• Total water vapor along LOS path(vap)
• Altitude above mean sea level(alt)
• tkbb
• tnd23
• sky31
• North latitude(lat)
• Mean 31.4 GHz sky brightness temperature(tbsky31)
• bb31
• time_offset
• tc31