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
• Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity)
• totalPrecipitableWater2RmsError
• Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
• Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
• wetWindowFlag
• 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
• Retrieved dewpoint temperature(dewpointTemperature)
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
• liquidWaterPath2RmsError
• frequency
• temperatureRmsError
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Air temperature(temperature)
• base_time
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• totalPrecipitableWaterRmsError
• Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight)
• lon
• lat
• azimuth
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)

NSA/MWRP/C1 - Reprocessed: Re-calibration

After being re-installed the radiometer was calibrated with liquid nitrogen.
Data between 8/8 and 9/6 have been reprocessed to apply the revised calibrations.

• 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)
• Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity)
• totalPrecipitableWater2RmsError
• 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)
• liquidWaterPathRmsError
• waterVaporDensityRmsError
• blackbodyTemperature
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)
• Height, lifting condensation level(liftingCondensationLevel)
• Height, level of free convection(levelFreeConvection)
• liquidWaterContentRmsError
• Retrieved dewpoint temperature(dewpointTemperature)
• liquidWaterPath2RmsError
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• totalPrecipitableWaterRmsError
• Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight)
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)

NSA/MWRP/C1 - Reprocessed: K-Band calibration drift

At the beginning of November, the K-band channel calibration started to drift. The MWRP 
brightness temperatures were about 1.5 K higher than the MWR-measured brightness 
temperatures. By the half of the month the differences were more than 2 K to become about 4 K by 
the end of November. On Nov 27 new calibration coefficients were derived and uploaded.

Data for 20061101-20061127 have been reprocessed with the revised calibrations and are 
available from the ARM Archive effective January 2007.

• Pressure, level of free convection(levelFreeConvectionPres)
• Height, lifting condensation level(liftingCondensationLevel)
• Pressure, lifting condensation level(liftingCondensationLevelPres)
• Height, level of free convection(levelFreeConvection)
• Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
• 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)
• Energy, potential, convective, available, from RUC model(cape)
• Retrieved dewpoint temperature(dewpointTemperature)
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)

NSA/MWRP/C1 - Incorrect surface measurements

Surface measurements are spiking and not comparing well with the co-located METTWR 
measurements.

On 2/13 site operators cleaned a filter in the heater housing resolving the problem.

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

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)
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)

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.

• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)

NSA/MWRP/C1 - Radiometer thermally unstable

Between Dec 21 and Dec 23 the external temperature dropped to - 38 C. This caused a 
problem with the stability of the noise diode mount temperature and consequent problem with 
calibration.

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

NSA/MWRP/C1 - Radiometer thermally unstable

During January the radiometer was thermally unstable during several days of cold weather. 
The worst days of thermal instability were between Jan 12 and Jan 17.

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

NSA/MWRP/C1 - Hardware failure- Intermittent data

Data are intermittent during this time due to a failure of the analog board.
The calibration of V-band data may have slightly drifted due to power outages.

• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Air temperature(temperature)
• Humidity, relative, prof. from sfc.-10km, from water vap. dens. and temp. prof.(relativeHumidity)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved dewpoint temperature(dewpointTemperature)

NSA/MWRP/C1 - Thermal instability- TKnd test

During this time the radiometer was thermally unstable . The noise diode physical 
temperature had sudden drops of more than 5 degree in several ccasions between 2/1 and 2/11. On 
2/12 the radiometer temperature set point was lowered of about 10 degree as a test. On 
2/27 a new analog board was installed in the instrument. Data after 2/27 show a slight 
change in calibration.

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

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)

NSA/MWRP/C1 - Spare radiometer installed

A spare radiometer was provided by Radiometrics while they try to fix our MWRP. The spare 
radiometer is of the same family as the one we have in Barrow and it will stay at the 
site until our radiometer is repaired.
A LN2 calibration will be performed next week.

• AVHRR satellite images for Darwin from BOM (RAW)(raw)

• 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
• Density, water vapor, at instrument height (1 or 2 m)(surfaceWaterVaporDensity)
• totalPrecipitableWater2RmsError
• 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)
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Height, lifting condensation level(liftingCondensationLevel)
• Height, level of free convection(levelFreeConvection)
• elevation
• liquidWaterContentRmsError
• Retrieved dewpoint temperature(dewpointTemperature)
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
• liquidWaterPath2RmsError
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
• frequency
• temperatureRmsError
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Air temperature(temperature)
• base_time
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• totalPrecipitableWaterRmsError
• Height, cloud base, height where IR temp. matches retrieved temp. profile(cloudBaseHeight)
• lon
• lat
• azimuth
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)

• AVHRR satellite images for Darwin from BOM (RAW)(raw)

NSA/MWRP/C1 - Radiometer in mixed scanning-zenith mode

After installing the spare radiometer (D080409.2), the data started to be intermittent and 
the software froze several times. To test if the problem was due to the scanning 
procedure used with the other radiometer, the instrument was run with a zenith-only procedure at 
times and with the usual scanning procedure at restart. When restarted with the scanning 
procedure the software had problems, so it was decided to run the spare instrument only 
with the zenith-viewing mode until our instrument comes back.

The quality of the data should be unaffected. The only difference is that only data 
collected at 90 degree angle will be available until our instrument comes back.

• 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)
• Energy, potential, convective, available, from RUC model(cape)
• infraredTemperature
• 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)
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Height, lifting condensation level(liftingCondensationLevel)
• elevation
• Height, level of free convection(levelFreeConvection)
• liquidWaterContentRmsError
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
• Retrieved dewpoint temperature(dewpointTemperature)
• liquidWaterPath2RmsError
• 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/MWRP/C1 - Intermittent data

A spare radiometer was installed a the site to substitute the malfunctioning radiometer 
(see DQRs D080409.2 and D080421.1). During this time the spare radiometer had problems 
starting and was stopping collection suddenly. Data during this time are very intermittent 
with large gaps.

• AVHRR satellite images for Darwin from BOM (RAW)(raw)

• 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)
• Energy, potential, convective, available, from RUC model(cape)
• infraredTemperature
• 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)
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Height, lifting condensation level(liftingCondensationLevel)
• elevation
• Height, level of free convection(levelFreeConvection)
• liquidWaterContentRmsError
• Temperature, air, at instrument height (1 or 2 m)(surfaceTemperature)
• Humidity, relative, at instrument height (1 or 2 m)(surfaceRelativeHumidity)
• liquidWaterPath2RmsError
• Retrieved dewpoint temperature(dewpointTemperature)
• 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

• AVHRR satellite images for Darwin from BOM (RAW)(raw)

NSA/MWRP/C1 - Reprocessed: LN2 calibration

On 4/9 a spare radiometer was installed at the site. On 4/18 a LN2 calibration was 
conducted. Upon examination of the data it appeared that the LN2 calibration was generally 
successful, however the 30-GHz channel was not calibrated properly.
New calibration coefficients for all K-band channels were derived and data for the whole 
month should be reprocessed with these newly derived coefficients. I will provide the new 
configuration file.

An explanation of the effects of the poor calibration is given in the Instrument Mentor 
Monthly Summary report. The poor calibration affected the LWP in particular. Re-calibration 
will correct the problem.

Data reprocessed 20080610.

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

NSA/MWRP/C1 - Increased RF intereference

The spare radiometer experienced increased levels of RF interference. The interference is 
prominent on the 30-GHz channel and LWP retrievals that appear particularly noisy.

• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)

NSA/MWRP/C1 - Reprocessed: LN2 calibrations applied

The V-band measurements were incorrect. The quantities affected were the temperature and 
humidity profiles.

The instrument was re-calibrated on July 18.  The new calibrations have been applied to 
the data for this time period.  The reprocessed data were archived in January 2009.

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

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

The V-band noise diode is showing signs of instability. Starting about August 5 the 
comparison of brightness temperatures with model showed an increased divergence resulting from 
a downward trend in the brightness temperatures of frequencies > 50 GHz.

Disregard brightness temperatures and retrieved products associated with the V-band 
channels. These include all profiles. Integrated water vapor and liquid water path are not 
affected.

• Pressure, level of free convection(levelFreeConvectionPres)
• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Height, lifting condensation level(liftingCondensationLevel)
• Air temperature(temperature)
• Pressure, lifting condensation level(liftingCondensationLevelPres)
• Height, level of free convection(levelFreeConvection)
• 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 - Incorrect V-band data

The V-band channels show a drift during this time.

• Pressure, level of free convection(levelFreeConvectionPres)
• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Height, lifting condensation level(liftingCondensationLevel)
• Air temperature(temperature)
• Pressure, lifting condensation level(liftingCondensationLevelPres)
• Height, level of free convection(levelFreeConvection)
• 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)
• Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
• Microwave brightness temperature(brightnessTemperature)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)

NSA/MWRP/C1 - Reprocessed: Negative bias in LWP

After the radiometer was installed at the site following extensive refurbishing the 
retrieved LWP had a large negative bias (~-0.07 mm). The calibration coefficients were modified 
and that resolved the problem. Data for February, March and part of April were 
reprocessed with the revised calibrations and archived in July.

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

NSA/MWRP/C1 - Reprocessed: V-band channels too cold

The calibrations of 7/20 and 7/29 were slightly affected by high humidity at the site. As 
a result the V-band channels were calibrated too cold.

On 8/26 the mentor modified the configuration file and reinstated the calibration 
coefficients derived on 3/20/2009.

Data were reprocessed 20100118.

• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Air temperature(temperature)
• Microwave brightness temperature(brightnessTemperature)

NSA/MWRP/C1 - Reprocessed: LN2 calibration

The instrument was calibrated on 3/5/2010. These latest calibration coefficients have been 
applied to February data as well to mitigate the high bias in LWP observed in February.  
Reprocessed data were archived April 2010.

• Pressure, level of free convection(levelFreeConvectionPres)
• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Height, lifting condensation level(liftingCondensationLevel)
• Pressure, lifting condensation level(liftingCondensationLevelPres)
• Pressure, equilibrium level(equilibriumLevelPres)
• Height, level of free convection(levelFreeConvection)
• 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)
• Retrieved dewpoint temperature(dewpointTemperature)
• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Density, water vapor, prof. from sfc.-10 km, der. from Tbright stat. retrvl.(waterVaporDensity)
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Retrieved water vapor mixing ratio(waterVaporMixingRatio)
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)

NSA/MWRP/C1 - IRT readings bias

The MWRP IRT appeared to not be reaching its lower limit (-50 C / 223.15 K). The readings 
stayed around 230 K although the sky was clear. On 6/16 the site technicians noticed that 
the gold mirror was scratched and appeared to have a deposit on it. The mirror was 
replaced and on 6/17 the lens was cleaned. These actions solved the problem.

• infraredTemperature

NSA/MWRP/C1 - Reprocessed: Incorrect calibration

The calibration of the MWRP drifted starting on September 21. The drift caused a negative 
LWP. On 10/21 I modified the calibration of the 30 GHz channel in an attempt to correct 
for the negative bias in LWP. The change in the calibration however caused an excessive 
increase in the PWV retrievals. The original calibration values were reinstated on 10/29. I 
then recomputed the temperature coefficients as well as the noise diode injection 
temperature from tip curves and uploaded the new values on Nov 15 2010. 

Reprocess the data from 9/21 to 11/15 with the newly computed coefficients.

Reprocessing completed 20110111.

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

NSA/MWRP/C1 - Calibration drift

The radiometer showed increased drift in the K-band calibration. Several attempts to 
correct for the drift did not return the expected result.  

Instrument was removed from service 20110201 and returned to vendor for repair.

Data are erratic; data use during the indicated time is not recommended.

• Water vapor, total precipitable, derived from Tbright using stat. retrvl.(totalPrecipitableWater)
• Temperature, virtual, vert. prof. sfc-10km, fr. wtr. vap. dens. and temp. prof.(virtualTemperature)
• Height, lifting condensation level(liftingCondensationLevel)
• Height, level of free convection(levelFreeConvection)
• 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)
• Liquid water content, cloud, vert. prof. sfc.-10km, from Tbright stat. retrvl.(liquidWaterContent)
• Liquid water path, from brightness temperatures using statistical retrieval(liquidWaterPath)
• Microwave brightness temperature(brightnessTemperature)
• Liquid water path, from Tbright at 23.835 and 30.0 GHz only, using stat. retrvl.(liquidWaterPath2)
• Water vapor, tot. precipitable, from Tbright, 23.835 & 30.0 GHz, stat. retrvl.(totalPrecipitableWater2)