Data Quality Reports for Session: 105381 User: fleurc Completed: 04/25/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060112.4NIM/SKYRAD/M1 - IRTs do not agree with AERInimskyrad60sM1.b1
D060419.3NIM/MWRP/M1 - Instrument noise problemnimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00
D060419.4NIM/MWR/M1 - Instrument noise problem/RF interferencenimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
D060420.5NIM/MWRP/M1 - IRT Sensor CalibrationnimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00
D060524.2NIM/MET/M1 - Optical Rain Gauge FailurenimmetM1.b1
D060530.1NIM/ECOR/M1 - Data Suspect for NW and East Wind Directionsnim30ecorM1.b1
D060531.7nim30ecorM1.b1
D060602.2NIM/MWRP/M1 - Reprocessed: IRT configuration setting errornimmwrpM1.b1
D060619.1NIM/MWRP/M1 - Reprocessed - New retrieval coefficientsnimmwrpM1.b1
D060713.1NIM/MWRP/M1 - 51.25 GHz channel calibration driftednimmwrpM1.b1
D060718.1NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating.nimmwrlosM1.b1, nimmwrtipM1.a1
D060817.1NIM/MET/M1 - Reprocess: Barometric Data Changed from hPa to kPanimmetM1.b1
D060817.2NIM/MET/S1 - Reprocess: Barometric Data Changed from hPa to kPanimmetS1.b1
D061003.3NIM/MWRP/M1 - IRTs do not agree with AERI nimmwrpM1.b1
D061003.4NIM/AERI/M1 - IRTs do not agree with AERInimaerisummaryM1.b1
D070215.5NIM/ECOR/M1 - Effects on ECOR CO2 Flux and Concentration By Aircraftnim30ecorM1.b1


DQRID : D060112.4
Start DateStart TimeEnd DateEnd Time
11/26/2005000006/07/20061900
Subject:
NIM/SKYRAD/M1 - IRTs do not agree with AERI
DataStreams:nimskyrad60sM1.b1
Description:
Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky 
temperatures than the AERI and the MWRP IRT measureed about 20K higher than the AERI.  
Several actions were taken to diagnose the problem including confirming the correct 
configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror.

After several days of rain beginning 6/2/2006, the three instruments came into agreement. 
It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT.
Measurements:nimskyrad60sM1.b1:
  • Sky/Cloud Infra-Red Temperature(sky_ir_temp)
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)


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DQRID : D060419.3
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWRP/M1 - Instrument noise problem
DataStreams:nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00
Description:
There are spikes and elevated noise in MWRP data. The origine of the spikes is RF 
interference from various sources.  All brightness temperatures are affected, but in particular 
the 5 K-band channels. LWP retrievals are noisy and affected by spikes as a result.
Measurements:nimmwrprawM1.00:
  • Raw data stream - documentation not supported(raw)

nimmwrpM1.b1:
  • Retrieved cloud liquid water content(liquidWaterContent)
  • Derived relative humidity(relativeHumidity)
  • Derived virtual temperature(virtualTemperature)
  • Interpolated water vapor mixing ratio(waterVaporMixingRatio)
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Surface air temperature for last 5 minutes of previous hour(temperature)
  • Retrieved water vapor density(waterVaporDensity)
  • Interpolated dewpoint temperature(dewpointTemperature)
  • Retrieved liquid water path(liquidWaterPath)
  • Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
  • Microwave brightness temperature(brightnessTemperature)
  • Retrieved total precipitable water vapor(totalPrecipitableWater)

nimmwrpM1.00:
  • Raw data stream - documentation not supported(raw)


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DQRID : D060419.4
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWR/M1 - Instrument noise problem/RF interference
DataStreams:nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
Data are affected by intermittent spikes that become more frequent starting in March 2006. 
Spikes affect data mostly around 9 AM and 18:00 PM. The origin of the spikes is probably 
RF interference.
Measurements:nimmwrlosM1.b1:
  • Mean total liquid water amount along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Mean total water vapor amount along LOS path(vap)
  • 31.4 GHz sky signal(sky31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • 23.8 GHz sky signal(sky23)

nimmwrM1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

nimmwrtipM1.a1:
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • 23.8 GHz sky signal(tipsky23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)


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DQRID : D060420.5
Start DateStart TimeEnd DateEnd Time
01/15/2006000006/03/20060000
Subject:
NIM/MWRP/M1 - IRT Sensor Calibration
DataStreams:nimmwrpM1.00, nimmwrpM1.b1, nimmwrprawM1.00
Description:
Discrepancies between the MWRP and Skyrad IRT were observed in January. The MWRP IRT 
readings were constantly higher than those of the skyrad IRT. Some changes were introduced to 
the MWRP IRT to address the problem (see DQR D060602.2). On May 3, the IRT mirror was 
replaced. After the change in the mirror, the MWRP IRT readings became about 5-8 C lower. On 
June 3 the agreement between MWRP and Skyrad IRT became satisfactory (2-5 degree C 
difference).

It is hard to numerically quantify the difference in the IRT readings caused by the change 
in the mirror. We can only warn the user that between January 1 and June 3 the MWRP 
readings are 8 to 15 degree higher than the skyrad IRT.
Measurements:nimmwrprawM1.00:
  • Raw data stream - documentation not supported(raw)

nimmwrpM1.b1:
  • Zenith-pointing infrared temperature at 10um(infraredTemperature)

nimmwrpM1.00:
  • Raw data stream - documentation not supported(raw)


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DQRID : D060524.2
Start DateStart TimeEnd DateEnd Time
05/13/2006000005/26/20061015
Subject:
NIM/MET/M1  - Optical Rain Gauge Failure
DataStreams:nimmetM1.b1
Description:
The optical rain gauge on the met system did not record precipitation during this time 
period.
Measurements:nimmetM1.b1:
  • Precipitation rate mean(precip_rate_mean)
  • Precipitation rate maximum(precip_rate_max)
  • Precipitation rate minimum(precip_rate_min)
  • Precipitation rate standard deviation(precip_rate_sd)


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DQRID : D060530.1
Start DateStart TimeEnd DateEnd Time
11/26/2005153012/31/20062359
11/26/2005153001/07/20072359
Subject:
NIM/ECOR/M1 - Data Suspect for NW and East Wind Directions
DataStreams:nim30ecorM1.b1
Description:
Data for these wind directions must be closely evaluated to determine if it is correct or 
incorrect.  Problem will remain for the entire extend of the NIM deployment.
Measurements:nim30ecorM1.b1:
  • rotated covariance uw(cvar_rot_uw)
  • vw covariance(cvar_vw)
  • rotated covariance wc(cvar_rot_wc)
  • mean value of out of range values and spikes of t -9999 if no spikes(mean_spk_t)
  • CO2 flux(fc)
  • mean sonic temperature (t), i.e. virtual temperature(mean_t)
  • corrected sensible heat flux(h)
  • latent heat flux(lv_e)
  • rotated covariance vw(cvar_rot_vw)
  • rotated mean w(mean_rot_w)
  • mean water vapor concentration (q)(mean_q)
  • covariance wq(cvar_wq)
  • rotated covariance wt(cvar_rot_wt)
  • rotated covariance wq(cvar_rot_wq)
  • mean value of out of range values and spikes of q -9999 if no spikes(mean_spk_q)
  • momentum flux (dynamic)(k)
  • mean co2 concentration (c)(mean_c)
  • uw covariance(cvar_uw)
  • covariance wc(cvar_wc)
  • mean value of \spike\ w samples(mean_spk_w)
  • wT covariance(cvar_wt)
  • mean w (vertical) wind component(mean_w)
  • friction velocity(ustar)
  • mean value of out of range values and spikes of c -9999 if no spikes(mean_spk_c)


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DQRID : D060531.7
Start DateStart TimeEnd DateEnd Time
05/15/2006050005/28/20061930
Subject:
DataStreams:nim30ecorM1.b1
Description:
Measurements:

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DQRID : D060602.2
Start DateStart TimeEnd DateEnd Time
01/15/2006000004/21/20060000
Subject:
NIM/MWRP/M1 - Reprocessed: IRT configuration setting error
DataStreams:nimmwrpM1.b1
Description:
The infrared thermometer settings (IRT) were not configured as specified by the 
manufacturer. The analog output was set to a range of -60 to +50 C (0-10V) instead of -50 to +50 C 
(0-10V). The settings were changed on April 20. The IR temperatures should be slightly 
smaller than reported.

The data have been reprocessed to correct the IRT calibrations.  Reprocessed data were 
archived in August 2006.
Measurements:nimmwrpM1.b1:
  • Zenith-pointing infrared temperature at 10um(infraredTemperature)


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DQRID : D060619.1
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWRP/M1 - Reprocessed - New retrieval coefficients
DataStreams:nimmwrpM1.b1
Description:
Occasionally, the retrieved relative humidity was exceeding 120%. Upon reviewing the data 
it was noticed that the high values were appearing in the highest layers (above 8 km) and 
especially during spring season. Since retrievals at the highest levels are mainly 
affected by the climatology used to constrain the retrievals, we reviewed the statistical 
coefficients that were used to retrieve temperature and humidity. It was discovered that, in 
the training dataset (radiosonde), there were a few outliers (invalid radiosonde 
soundings) that had escaped the screening process and were affecting the computations of the 
retrieval coefficients.

We recomputed the retrieval coefficients with the newly screened set of radiosonde data 
and reprocessed all the previous data at Niamey.  The reprocessed data were archived in 
August 2006.

The new coefficients improve temperature and humidity profiles in two ways. The relative 
humidity will not exceed 120% in the upper layers and the temperature profiles will be in 
better agreement with the sonde in the first 4 km.
Measurements:nimmwrpM1.b1:
  • Expected root-mean-square error in liquid water path retrieval(liquidWaterPathRmsError)
  • Expected root-mean-square error in liquid water content retrieval(liquidWaterContentRmsError)
  • Expected root-mean-square error in liquid water path retrieval using only 23.835
    and 30.0 GHz(liquidWaterPath2RmsError)
  • Retrieved cloud liquid water content(liquidWaterContent)
  • Derived relative humidity(relativeHumidity)
  • Derived virtual temperature(virtualTemperature)
  • Interpolated water vapor mixing ratio(waterVaporMixingRatio)
  • Expected root-mean-square error in precipitable water retrieval(totalPrecipitableWaterRmsError)
  • Expected root-mean-square error in water vapor density retrieval(waterVaporDensityRmsError)
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Surface air temperature for last 5 minutes of previous hour(temperature)
  • Retrieved water vapor density(waterVaporDensity)
  • Interpolated dewpoint temperature(dewpointTemperature)
  • Retrieved liquid water path(liquidWaterPath)
  • Cloud-base height, from Micropulse LIDAR or Belfort LIDAR ceilometer(cloudBaseHeight)
  • Retrieved total precipitable water vapor using only 23.835 and 30.0 GHz(totalPrecipitableWater2)
  • Expected root-mean-square error in temperature retrieval(temperatureRmsError)
  • Expected root-mean-square error in precipitable water retrieval using only
    23.835 and 30.0 GHz(totalPrecipitableWater2RmsError)
  • Retrieved total precipitable water vapor(totalPrecipitableWater)


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DQRID : D060713.1
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWRP/M1 - 51.25 GHz channel calibration drifted
DataStreams:nimmwrpM1.b1
Description:
After a power outage on May 5 the 51.25 GHz had a slight change in the calibration. The 
resulting LWP computed by using all 6 channels increased of about 0.025 mm (25 g/m2).
Measurements:nimmwrpM1.b1:
  • Microwave brightness temperature(brightnessTemperature)


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DQRID : D060718.1
Start DateStart TimeEnd DateEnd Time
Subject:
NIM/MWR/M1 - Reprocessed: Recalibration to correct for occasional overheating.
DataStreams:nimmwrlosM1.b1, nimmwrtipM1.a1
Description:
The radiometer was intermittently thermally unstable resulting in poor calibrations for 
four brief time periods.  These data have been reprocessed to apply corrected calibrations. 
 The affected time periods were:

20060302-20060303
20060423-20060425
20060512-20060515
20060531-20060603
Measurements:nimmwrlosM1.b1:
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Mean total water vapor amount along LOS path(vap)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • 23.8 GHz Blackbody signal(bb23)
  • Noise diode mount temperature(tknd)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Blackbody kinetic temperature(tkbb)
  • 23.8 GHz sky signal(sky23)
  • Mean total liquid water amount along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • 31.4 GHz sky signal(sky31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz Blackbody signal(bb31)

nimmwrtipM1.a1:
  • 31.4 GHz blackbody+noise injection signal(bbn31)
  • Mixer kinetic (physical) temperature(tkxc)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • 31.4 GHz Blackbody signal(bb31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • 31.4 GHz goodness-of-fit coefficient(r31)
  • 31.4 GHz sky signal(tipsky31)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • 23.8 GHz goodness-of-fit coefficient(r23)
  • 23.8 GHz blackbody+noise injection signal(bbn23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • 23.8 GHz Blackbody signal(bb23)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • 23.8 GHz sky signal(tipsky23)
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Blackbody kinetic temperature(tkbb)
  • Noise diode mount temperature(tknd)


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DQRID : D060817.1
Start DateStart TimeEnd DateEnd Time
01/06/2006000007/10/20060930
Subject:
NIM/MET/M1 - Reprocess: Barometric Data Changed from hPa to kPa
DataStreams:nimmetM1.b1
Description:
Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.
Measurements:nimmetM1.b1:
  • Atmospheric pressure(atmos_pressure)


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DQRID : D060817.2
Start DateStart TimeEnd DateEnd Time
12/26/2005000007/13/20060727
Subject:
NIM/MET/S1 - Reprocess: Barometric Data Changed from hPa to kPa
DataStreams:nimmetS1.b1
Description:
Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.
Measurements:nimmetS1.b1:
  • Atmospheric pressure(atmos_pressure)


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DQRID : D061003.3
Start DateStart TimeEnd DateEnd Time
01/09/2006000106/07/20061900
Subject:
NIM/MWRP/M1 - IRTs do not agree with AERI
DataStreams:nimmwrpM1.b1
Description:
Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky 
temperatures than the AERI and the MWRP IRT measured about 20K higher than the AERI.  
Several actions were taken to diagnose the problem including confirming the correct 
configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror.

After several days of rain beginning 6/2/2006, the three instruments came into agreement. 
It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT.
Measurements:nimmwrpM1.b1:
  • Zenith-pointing infrared temperature at 10um(infraredTemperature)


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DQRID : D061003.4
Start DateStart TimeEnd DateEnd Time
01/07/2006000906/07/20061900
Subject:
NIM/AERI/M1 - IRTs do not agree with AERI
DataStreams:nimaerisummaryM1.b1
Description:
Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky 
temperatures than the AERI and the MWRP IRT measured about 20K higher than the AERI.  
Several actions were taken to diagnose the problem including confirming the correct 
configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror.

After several days of rain beginning 6/2/2006, the three instruments came into agreement. 
It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT.
Measurements:nimaerisummaryM1.b1:
  • AERI SW Scene Brightness Temp Spectral Averages (Ch2)(SkyBrightnessTempSpectralAveragesCh2)
  • AERI LW Scene Brightness Temp Spectral Averages (Ch1)(SkyBrightnessTempSpectralAveragesCh1)


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DQRID : D070215.5
Start DateStart TimeEnd DateEnd Time
11/26/2005153001/07/20072330
Subject:
NIM/ECOR/M1 - Effects on ECOR CO2 Flux and Concentration By Aircraft
DataStreams:nim30ecorM1.b1
Description:
Aircraft landings, departures, and running aircraft on the airport pad
were found to produce large spikes in the half hourly CO2 flux and small spikes in CO2 
concentration on many days during the entire deployment of the AMF at NIM.  This influence 
was found on 40% of the days in March and April 2006 and sometimes for multiple periods in 
a day; this was typical of  the year of data.  The spikes range from only several 
micromoles s-1 m-2 to one hundred or more for flux (a typical spike was in the twenties) and 
near zero to 1.0 mmoles m-3 for CO2 concentration (typically around 0.15).

The aircraft influence was caused by persistent easterly winds; the airport
terminal pad and the nearest part of the runway were almost directly to the
east of the ECOR location.

Occasionally an influence on water vapor density was detected, but this was fairly rare 
and usually of very small magnitude.
Measurements:nim30ecorM1.b1:
  • rotated covariance vc(cvar_rot_vc)
  • covariance wc(cvar_wc)
  • rotated covariance wc(cvar_rot_wc)
  • covariance of tc(cvar_tc)
  • CO2 flux(fc)
  • rotated covariance uc(cvar_rot_uc)
  • variance of variable c(var_c)
  • covariance vc(cvar_vc)
  • covariance uc(cvar_uc)
  • mean co2 concentration (c)(mean_c)


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END OF DATA