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, mean, 5-min avg(liq)
• tc23
• tnd_nom31
• tc31

GRW/WACR/M1 - Reprocessed: Reflectivity and Height Offsets

The instrument vendor informed us of a range (height) offset of 13 m and provided updated 
reflectivity calibration.  All values reported for 'Reflectivity' were approximately 3 dB 
too low.   In addition, the Reflectivity in the first and fourth range gates (starting 
from the surface) needed to be further corrected by an additional 2.7 and -0.9 dB, 
respectively. The 'height' field values were 13.33 m too low.  The data were reprocessed to 
correct these problems.

The grwwacrM1.b1 data were reprocessed and archived in October 2010.  The 
grwwacrspeccmaskcopolM1.a0 and grwwacrspeccmaskxpolM1.a0 data were reprocessed and archived in January 
2012.

• Reflectivity(Reflectivity)
• heights

• Reflectivity(Reflectivity)
• heights

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, mean, 5-min avg(liq)
• tc23
• tnd_nom31
• tc31

GRW/MWRP/M1 - Reprocessed: Updated calibration coefficients

On 9/8/2010 the calibration of of the K-band channels was updated. This caused a slight 
decrease of the retrieved liquid water path. 

Updated calibrations have been applied to data from 7/1-9/8.  The LWP was decreased 
slightly as a result of the recalibration.  Reprocessed data were archived in November 2010.

• Microwave brightness temperature(brightnessTemperature)
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
• Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)

GRW/WACR/M1 - Transmit power drop outs

At approximately 16:27 GMT on 20090727, txpower began intermittently dropping out and 
reporting slightly negative values.  This issue continued intermittently through 20090807 
when it stopped occurring.  The problem resumed 20091006 and continued to occur on a daily 
basis until the monitor detector was replaced 20101019.

The transmit power as measured by the detector after replacement was approximately 1.3 dB 
less than when it failed.  Reflectivity measurements have a +0/-1.3 dBZ of additional 
uncertainty for this period of time.

• txpower
• Reflectivity(Reflectivity)

• txpower
• Reflectivity(Reflectivity)

GRW/TSI/M1 - Data processing problem

Values of count_opaque and count_thin are reals but should be integers 
(units = pixels).

• count_thin
• count_opaque

GRW/WACR/M1 - Incorrect value for antenna_altitude global attribute

The global attribute antenna_altitude is incorrect.  The correct value should be 3.8608 m. 
 This is the height of the WACR antenna above the ground.  The value is used, along with 
site altitude, in converting heights above MSL to range above the radar antenna.

• heights

GRW/TSI/M1 - Reprocessing Notice (RID 951)

See below for details of reprocessing that was completed on 20140922.  Original 
DQR category: 5 (Transparent - Does not affect quality).

-----------------------------------------------------------

The units of global attributes region_sun_radius and region_zenith_radius should be 
degrees, not pixels.

• base_time