NSA/MWRP/C1 - Missing data

Data are missing and unrecoverable.

• Pressure, level of free convection(levelFreeConvectionPres)
• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Pressure, lifting condensation level(liftingCondensationLevelPres)
• Pressure, equilibrium level(equilibriumLevelPres)
• dataQualityFlags
• totalPrecipitableWater2RmsError
• Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity)
• Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
• wetWindowFlag
• Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
• Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
• Height, equilibrium level(equilibriumLevel)
• infraredTemperature
• Energy, potential, convective, available, from RUC model(cape)
• time
• time_offset
• liquidWaterPathRmsError
• waterVaporDensityRmsError
• Barometric pressure(pressure)
• blackbodyTemperature
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)
• alt
• Pressure, barometric. at instrument height (1 or 2 m)(surfacePressure)
• Height, lifting condensation level(liftingCondensationLevel)
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Height, level of free convection(levelFreeConvection)
• elevation
• liquidWaterContentRmsError
• liquidWaterPath2RmsError
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
• Retrieved dewpoint temperature(dewpointTemperature)
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• temperatureRmsError
• frequency
• Air temperature(temperature)
• base_time
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• totalPrecipitableWaterRmsError
• lon
• Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight)
• lat
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)
• azimuth

NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry

The output precision of the following variables was increased 20060929:

   alt	changed from 1m to 0.1m
   dp	changed from 0.1degC to 0.01degC
   pres changed from 0.1 hPa to 0.01 hPa
   RH	changed from 1%RH to 0.01%RH
   tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase
in accuracy.  Users are cautioned to continue to use their best scientific
judgement when using these or any other data.

• alt
• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)
• Pressure, atmospheric, constant value of model level, RUC model output(pres)
• Humidity, relative(rh)

NSA/MWRP/C1 - Incorrect surface measurements

The MWRP surface temperature and pressure readings were in disagreement with those from 
other instruments. The possible cause of the disagreement was ice buildup around the 
sensors.  Readings returned to normal March 29.

The temperature readings were more affected. Since the readings are erratic, with large 
oscillations, it is not possible to correct them. Disregard the surface temperature and 
humidity readings during this time. The wrong readings will affect the first layer of the 
temperature and humidity profiles as well.

• Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity)
• Pressure, barometric. at instrument height (1 or 2 m)(surfacePressure)
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)

NSA/MWRP/C1 - Reprocessed: 6-channel retrieval replaced by 5-channel retrieval

Due to repeated failure of the V-band receiver and calibration problems, the 6-channel 
retrieval was retired and a new 5-channel retrieval which uses only the K-band channels was 
implemented.

All data previously processed with the 6-channel retrieval have been reprocessed.

Please note that the 7 channels (brightness temperatures) in the V-band range (51 to 60 
GHz) should not be used.  See D080331.1 and D080331.2.

• Microwave brightness temperature(brightnessTemperature)
• 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)

NSA/MWRP/C1 - V-band Noise diode unstable

Sometimes between Jan and March 2007 the V-band noise diode started to be unstable. V-band 
channels during this period show large discrepancies with model computations. The 
problem was evident during the month of January. During February and March the problem was less 
visible, however measurement model comparisons show an increased bias. The instrument 
was calibrated with LN2 on March 15 and the calibration results showed a large drift in the 
calibration parameters.  The hardware failure will have consequences in the retrievals 
of temperature and relative humidity profiles. 

It is difficult to establish when the failure started. Disregard the V-band channels 
during this period. Vertical profiles of temperature and humidity are affected as well. Please 
note that this DQR only covers the 7 channels (brightness temperatures) in the V-band 
range (51 to 60 GHz). The 5 K-band channels (20-31 GHz) are not affected.

• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)
• Retrieved dewpoint temperature(dewpointTemperature)

NSA/MWRP/C1 - V-band Noise diode failure

The LN2 calibration on 3/15 showed a large drift of the V-band calibration parameters. The 
radiometer was calibrated again in June and was sent out for repairs in July 2007.

Between 3/15 and 7/13 2007 the V-band data are incorrect and should be disregarded. The 
failure affects the retrieved vertical profiles of temperature and humidity as well.

Please note that the hardware failure affected the 7 V-band channels only (51-60 GHz). 
Channels in the frequency range between 20 and 30 GHz are not affected. Integrated liquid 
water (LWP) and water vapor (PWV) are not affected since they use K-band channels only.

• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Air temperature(temperature)
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)