DQRID : D040527.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/14/2001001010/19/20011614Does not affect quality
10/29/2001162211/20/20011657Does not affect quality
more
Subject:
SGP/AERI/C1 - Time Offset Corrected
DataStreams:sgpaerilbldifflsC1.c1, sgpaeri01ch2C1.a1, sgplblch1aeriC1.c1, sgpaeriprofC1.c1,
sgpqmeaeriprofC1.c1, sgpaeri01engineerC1.a1, sgpaerilbldiffC1.c1, sgpqmeaerilbllsC1.c1,
sgpqmeaerilblC1.c1, sgplblch2aeriC1.c1, sgpqmeaerimeansC1.c1, sgpaerilblcloudsC1.c1,
sgpaeri01summaryC1.a1, sgpaeri01ch1C1.a1, sgpgaeriprofC1.c1
Description:
The SGP.C1 AERI system clock was not being regularly checked and synched
with a time server between May 2001 and November 2001.  When the problem
was identified and the clock was corrected, a time offset of 17 minutes
and 2 seconds (slow) was present.

The data available from the ARM Archive have been time corrected
by Dave Turner using a piece-wise linear function based on a comparison
of pressure data from the AERI and SMOS. Dave indicates "this results
in a good fit to the data" and "errors in the reported sample times are
reduced to approximately 1 minute or less.  Given the nominal three minute
averaging period of the AERI, this should suffice for most applications."

Data between 20011019.1615-20011029.1621 did not need to be corrected
due to a series of events that caused the clock to be temporarily
synched and then revert back to the linear drift pattern.

Note, there are three other variables in the AERI data products which
report time: Time, timeHHMMSS and rawTimeHHMMSS.  The data in these
variables were not modified, so these data will not agree with basetime
+ time_offset.

Also note, VAPs which use the AERI data as input were NOT reprocessed.
VAP data during the time period specified are questionable and should
be used with caution.
Suggestions: 
Measurements:sgpqmeaeriprofC1.c1:
  • time_offset
  • integ_vap_partial_sonde
  • integ_vap_retrieval
  • temperature_RMSE
  • temperature_25m_resid
  • water_flag
  • mixing_ratio_60m_tower
  • mixing_ratio_60m_resid
  • dewpoint_resid
  • cloudBaseHeight
  • dewpoint_25m_resid
  • sonde_max_height
  • temperature_60m_resid
  • mixing_ratio_RMSE
  • base_time
  • dewpoint_RMSE
  • time_offset_60m_tower
  • mixing_ratio_resid
  • temperature_resid
  • integ_vap_entire_sonde
  • time_offset_25m_tower
  • mixing_ratio_25m_tower
  • sonde_serial_number
  • dewpoint_60m_resid
  • totalPrecipitalWater
  • sonde_offset_time
  • mixing_ratio_25m_resid
more
sgplblch2aeriC1.c1:
  • surface_time_offset
  • max_sonde_alt
  • model_rad
  • time_offset
  • base_time
  • ozone
  • sonde_serial_number
  • sonde_surface_T
  • wisc_summary_T_ch2
  • wisc_summary_T_ch1
more
sgpgaeriprofC1.c1:
  • temperature
  • init_temperature
  • pressure
  • water_flag
  • time_offset
  • input_flag
  • init_waterVaporMixingRatio
  • totalPrecipitalWater
  • status_flag
  • cloudBaseHeight
  • waterVaporMixingRatio
  • dewpointTemperature
  • init_pressure
  • base_time
  • init_dewpointTemperature
more
sgpqmeaerilbllsC1.c1:
  • mean_abs_resid_ch_unsat
  • integ_rad_bin_sat
  • integ_rad_pro_all
  • SMOS_vap_pres
  • integ_rad_bin_pro_unsat
  • SMOS_offset_time
  • integ_rad_ch_pro_all
  • integ_rad_ch_sat
  • mean_abs_resid_unsat
  • integ_rad_ch_pro_unsat
  • integ_rad_bin_unsat
  • mean_resid_bin_pro_unsat
  • integ_rad_bin_pro_all
  • mean_abs_resid_bin_pro_unsat
  • integ_resid_bin_pro_unsat
  • model_surfT
  • integ_abs_resid_bin_unsat
  • integ_resid_unsat
  • integ_resid_bin_unsat
  • mean_resid_ch_unsat
  • integ_abs_resid_pro_unsat
  • integ_rad_sat
  • integ_abs_resid_unsat
  • mean_resid_pro_unsat
  • integ_rad_ch_unsat
  • integ_rad_pro_sat
  • sdev_resid_pro_unsat
  • integ_abs_resid_bin_pro_unsat
  • SMOS_sd_vap_pres
  • integ_rad_ch_pro_sat
  • sdev_resid_unsat
  • SMOS_sd_temp
  • SMOS_bar_pres
  • integ_rad_unsat
  • integ_rad_bin_pro_sat
  • sdev_resid_ch_unsat
  • SMOS_sd_bar_pres
  • SMOS_precip
  • SMOS_sd_rh
  • mean_resid_unsat
  • sdev_resid_bin_unsat
  • aeri_dwell_atm_var
  • mean_AERI_BT
  • SMOS_temp
  • integ_resid_ch_pro_unsat
  • base_time
  • mean_abs_resid_ch_pro_unsat
  • integ_rad_ch_all
  • surface_temp_from_aeri_used
  • sonde_offset_time
  • integ_rad_pro_unsat
  • time_offset
  • meas_atm_var_bin3
  • integ_abs_resid_ch_unsat
  • mean_abs_resid_bin_unsat
  • SMOS_rh
  • integ_rad_bin_all
  • transparent_region_dq_flag
  • mean_resid_bin_unsat
  • sdev_resid_bin_pro_unsat
  • mean_resid_ch_pro_unsat
  • sdev_resid_ch_pro_unsat
  • integ_rad_all
  • integ_resid_pro_unsat
  • meas_atm_var_T1
  • mean_abs_resid_pro_unsat
  • sonde_surfT
  • integ_resid_ch_unsat
  • integ_abs_resid_ch_pro_unsat
more
sgpaerilbldiffC1.c1:
  • sonde_offset_time
  • integ_resid_ch_unsat
  • valid_aeri_data
  • surface_temp_from_aeri_used
  • transparent_region_dq_flag
  • base_time
  • rad_difference
  • time_offset
  • mean_AERI_BT
more
sgpaeri01ch2C1.a1:
  • HBBapexTemp
  • outsideAirTemp
  • JulianDay
  • calibrationHBBtemp
  • BBcontroller2Temp
  • Longitude
  • BBcontroller1temp
  • coolerCurrent
  • calibrationAmbientTemp
  • Time
  • Latitude
  • computerTemp
  • Altitude
  • ABBtopTemp
  • BBcontroller2temp
  • fixed97KohmResistor
  • interferometerSecondPortTemp
  • mirrorMotorTemp
  • ABBapexTemp
  • mean_rad
  • HBBbottomTemp
  • hatchIndicator
  • ABBbottomTemp
  • BBcontroller1Temp
  • calibrationCBBtemp
  • rawTimeHHMMSS
  • coolerPowerSupplyTemp
  • base_time
  • HBBtopTemp
  • atmosphericPressure
  • fixed2500ohmResistor
  • detectorTemp
  • standard_dev_mean_rad
  • motorDriverTemp
  • time_offset
  • coolerExpanderTemp
  • timeHHMMSS
  • SCEtemp
  • SCETemp
  • missingDataFlag
  • sceneMirPosEncoder
  • spareTemp
  • coolerCompressorTemp
  • atmosphericRelativeHumidity
  • rackAmbientTemp
  • fixed12KohmResistor
  • BBsupportStructureTemp
  • airNearBBsTemp
more
sgpaeri01engineerC1.a1:
  • rawAtmosphericPressure
  • engineeringChannel2counts
  • countsStdDevPressure
  • countsStdDevRelativeHumidity
  • Altitude
  • time_offset
  • engineeringChannel1Counts
  • missingDataFlag
  • engineeringChannel0counts
  • fixed97KohmResistor
  • tempStdDevThermistor0
  • tempStdDevThermistor1
  • tempStdDevThermistor8
  • tempStdDevThermistor9
  • tempStdDevThermistor6
  • tempStdDevThermistor7
  • tempStdDevThermistor4
  • tempStdDevThermistor5
  • tempStdDevThermistor2
  • tempStdDevThermistor3
  • tempStdDevThermistor14
  • tempStdDevThermistor13
  • tempStdDevThermistor16
  • tempStdDevThermistor15
  • tempStdDevThermistor10
  • tempStdDevThermistor12
  • tempStdDevThermistor11
  • thermistor20
  • thermistor21
  • thermistor22
  • thermistor23
  • Latitude
  • base_time
  • thermistor15
  • thermistor16
  • thermistor17
  • thermistor18
  • thermistor19
  • thermistor10
  • thermistor11
  • thermistor12
  • thermistor13
  • thermistor14
  • engineeringChannel2Counts
  • fixed12KohmResistor
  • timeHHMMSS
  • engineeringChannel0Counts
  • engineeringChannel1data
  • thermistor2
  • thermistor3
  • thermistor0
  • thermistor1
  • engineeringChannel1Data
  • thermistor6
  • thermistor7
  • thermistor4
  • thermistor5
  • thermistor8
  • thermistor9
  • engineeringChannel0data
  • rawTimeHHMMSS
  • engineeringChannel0Data
  • Time
  • tempStdDevThermistor21
  • tempStdDevThermistor20
  • tempStdDevThermistor23
  • tempStdDevThermistor22
  • spareTemp
  • rawMirrorPositionEncoder
  • tempStdDevThermistor18
  • tempStdDevThermistor17
  • engineeringChannel1counts
  • tempStdDevThermistor19
  • Longitude
  • engineeringChannel2data
  • JulianDay
  • rawAtmosphericRelativeHumidity
  • engineeringChannel2Data
more
sgpaerilblcloudsC1.c1:
  • sdev_irt
  • mean_vap
  • sdev_31tbsky_large
  • nobs_cloud2_cbh
  • nonclear_flag
  • nobs_cloud3_cbh
  • nobs_mpl_foggy
  • sdev_23tbsky_large
  • wsi_offset_time
  • sdev_31tbsky
  • base_time
  • mean_mpl_cbh
  • nobs_mpl_clear
  • time_offset
  • nobs_cloud1_clear
  • cloud_cover_frac
  • nobs_mpl_cbh
  • aeri_dwell_atm_var_channel_1
  • aeri_dwell_atm_var_channel_2
  • nobs_mwr_ensembles
  • nobs_cloud2_clear
  • nobs_mwr_ensembles_large
  • sdev_23tbsky
  • mean_cloud3_cbh
  • sonde_serial_number
  • mean_liq
  • mean_cloud2_cbh
  • cloud_cover_fract
  • mean_AERI_BT_channel_2
  • mean_AERI_BT_channel_1
  • mean_31tbsky
  • cbh_AERI_channel_1
  • cbh_AERI_channel_2
  • mean_dir_by_diff_ratio
  • mean_cloud1_cbh
  • sdev_cloud1_cbh
  • sdev_liq
  • sdev_mpl_cbh
  • nobs_cloud3_clear
  • sdev_dir_by_diff_ratio
  • mean_23tbsky
  • num_cloud
  • sdev_vap
  • nonclear_inputs
  • integ_vap_sonde
  • mpl_cbh_dq_flag
  • sdev_cloud3_cbh
  • sonde_offset_time
  • calculated_irt
  • sdev_cloud2_cbh
  • mean_irt
  • nobs_cloud1_cbh
  • nobs_dir_by_diff_ratio
more
sgpqmeaerimeansC1.c1:
  • nobs_hour_rad
  • time_offset
  • mean_rad_ch_pro
  • mean_rad_bin_pro
  • base_time
  • mean_rad_bin
  • valid_aeri_data
  • sdev_rad_pro
  • mean_rad_all
  • sdev_rad_ch
  • sdev_rad_bin
  • mean_rad_ch
  • mean_hour_rad
  • sdev_rad_all
  • sdev_rad_bin_pro
  • mean_rad_pro
  • sdev_rad_ch_pro
  • sdev_hour_rad
more
sgpqmeaerilblC1.c1:
  • integ_rad_ch_pro_unsat
  • mean_resid_bin
  • mean_resid_bin_unsat
  • sdev_resid_bin
  • integ_rad_all
  • mean_resid
  • integ_abs_resid_unsat
  • SMOS_bar_pres
  • SMOS_offset_time
  • integ_rad_bin_pro_all
  • mean_abs_resid_pro_unsat
  • sonde_surfT
  • integ_abs_resid_ch_unsat
  • SMOS_temp
  • mean_resid_bin_pro_unsat
  • base_time
  • integ_abs_resid_pro_unsat
  • SMOS_sd_vap_pres
  • integ_abs_resid_ch_pro_unsat
  • integ_rad_ch_unsat
  • mean_abs_resid_bin_unsat
  • valid_aeri_data
  • mean_resid_unsat
  • integ_rad_ch_sat
  • integ_rad_ch_pro_sat
  • integ_resid_ch_unsat
  • integ_resid_bin_unsat
  • sdev_resid_unsat
  • mean_abs_resid_unsat
  • SMOS_precip
  • integ_rad_pro_unsat
  • integ_resid_bin_pro_unsat
  • mean_resid_ch
  • model_surfT
  • integ_rad_bin_all
  • integ_resid_unsat
  • mean_resid_bin_pro
  • sdev_resid_bin_pro
  • mean_resid_ch_pro
  • aeri_dwell_atm_var
  • nobs_resid_pro
  • sonde_offset_time
  • transparent_region_dq_flag
  • meas_atm_var_bin3
  • sdev_resid_bin_pro_unsat
  • SMOS_sd_temp
  • SMOS_vap_pres
  • mean_abs_resid_ch_pro_unsat
  • sdev_resid_pro
  • integ_abs_resid_bin_unsat
  • integ_abs_resid_bin_pro_unsat
  • sdev_resid_ch_pro_unsat
  • integ_rad_sat
  • sdev_resid
  • mean_resid_ch_pro_unsat
  • integ_rad_pro_sat
  • integ_resid_ch_pro_unsat
  • mean_abs_resid_ch_unsat
  • integ_rad_bin_pro_sat
  • nobs_resid_ch_pro
  • nobs_resid
  • nobs_resid_bin_pro
  • sdev_resid_ch_pro
  • SMOS_sd_bar_pres
  • integ_rad_bin_unsat
  • mean_resid_pro
  • surface_temp_from_aeri_used
  • integ_rad_ch_pro_all
  • SMOS_rh
  • sdev_resid_ch
  • mean_abs_resid_bin_pro_unsat
  • integ_rad_pro_all
  • sdev_resid_pro_unsat
  • integ_resid_pro_unsat
  • integ_rad_bin_pro_unsat
  • nobs_resid_bin
  • integ_rad_ch_all
  • SMOS_sd_rh
  • mean_resid_pro_unsat
  • mean_AERI_BT
  • time_offset
  • sdev_resid_bin_unsat
  • nobs_resid_ch
  • sdev_resid_ch_unsat
  • integ_rad_bin_sat
  • mean_resid_ch_unsat
  • integ_rad_unsat
  • meas_atm_var_T1
more
sgpaeriprofC1.c1:
  • temperature
  • init_pressure
  • totalPrecipitalWater
  • init_waterVaporMixingRatio
  • input_flag
  • status_flag
  • time_offset
  • water_flag
  • pressure
  • cloudBaseHeight
  • init_dewpointTemperature
  • dewpointTemperature
  • waterVaporMixingRatio
  • init_temperature
  • base_time
more
sgplblch1aeriC1.c1:
  • base_time
  • sonde_serial_number
  • ozone
  • model_rad
  • wisc_summary_T_ch2
  • wisc_summary_T_ch1
  • time_offset
  • surface_time_offset
  • max_sonde_alt
  • sonde_surface_T
more
sgpaeri01ch1C1.a1:
  • airNearBBsTemp
  • timeHHMMSS
  • Longitude
  • Latitude
  • time_offset
  • calibrationCBBtemp
  • rawTimeHHMMSS
  • fixed12KohmResistor
  • BBcontroller2Temp
  • SCEtemp
  • ABBtopTemp
  • calibrationHBBtemp
  • BBsupportStructureTemp
  • BBcontroller2temp
  • standard_dev_mean_rad
  • mean_rad
  • coolerExpanderTemp
  • calibrationAmbientTemp
  • SCETemp
  • coolerCurrent
  • coolerPowerSupplyTemp
  • computerTemp
  • detectorTemp
  • coolerCompressorTemp
  • Time
  • sceneMirPosEncoder
  • interferometerSecondPortTemp
  • atmosphericRelativeHumidity
  • rackAmbientTemp
  • BBcontroller1Temp
  • ABBapexTemp
  • fixed2500ohmResistor
  • BBcontroller1temp
  • base_time
  • fixed97KohmResistor
  • atmosphericPressure
  • Altitude
  • outsideAirTemp
  • mirrorMotorTemp
  • ABBbottomTemp
  • HBBbottomTemp
  • HBBapexTemp
  • hatchIndicator
  • spareTemp
  • motorDriverTemp
  • JulianDay
  • HBBtopTemp
  • missingDataFlag
more
sgpaerilbldifflsC1.c1:
  • rad_difference
  • mean_AERI_BT
  • base_time
  • transparent_region_dq_flag
  • sonde_offset_time
  • integ_resid_ch_unsat
  • surface_temp_from_aeri_used
  • time_offset
more
sgpaeri01summaryC1.a1:
  • SkyNENCh2
  • HBBviewStdDevRadiance700_705
  • SkyNENCh1
  • rackAmbientTemp
  • ABBviewStdDevRadiance985_990
  • ABBViewStdDevRadiance700_705
  • outsideAirTemp
  • ABBViewStdDevRadiance2510_2515
  • Time
  • SWskyNENacceptable
  • shortwaveWindowAirTemp2510_2515
  • ABBbottomTemp
  • twoMinuteNoiseEstimateFactor
  • coolerCurrent
  • skyViewStdDevRadiance2282_2287
  • HBBbottomTemp
  • shortwaveWindowRadiance2510_2515
  • missingDataFlag
  • LWskyNEN
  • timeHHMMSS
  • surfaceLayerRadiance2295_2300
  • ResponsivitySpectraAveragesCh2
  • HBBapexTemp
  • ResponsivitySpectraAveragesCh1
  • surfaceLayerAirTemp675_680
  • calibrationHBBtemp
  • HBBViewStdDevRadiance2510_2515
  • HBBtopTemp
  • ABBapexTemp
  • ABBViewStdDevRadiance2282_2287
  • LWskyNENacceptable
  • BBcontroller1Temp
  • JulianDay
  • BBcontroller1temp
  • detectorTemp
  • atmosphericRelativeHumidity
  • LWresponsivity
  • SCETemp
  • SCEtemp
  • BBsupportStructureTemp
  • Longitude
  • SWresponsivity
  • SWskyNEN
  • elevatedLayerRadiance700_705
  • airNearBBsTemp
  • skyViewStdDevRadiance985_990
  • Latitude
  • fixed2500ohmResistor
  • BBcontroller2Temp
  • HBBviewStdDevRadiance2282_2287
  • HBBViewStdDevRadiance675_680
  • BBcontroller2temp
  • HBBViewStdDevRadiance2295_2300
  • computerTemp
  • calibrationAmbientTemp
  • elevatedLayerRadiance2282_2287
  • HBBviewStdDevRadiance985_990
  • SkyUniformityCh2
  • ABBviewStdDevRadiance2295_2300
  • SkyUniformityCh1
  • calibrationCBBtemp
  • HBBViewStdDevRadiance700_705
  • surfaceLayerAirTemp2295_2300
  • ABBViewStdDevRadiance985_990
  • coolerExpanderTemp
  • HBBstable
  • ABBviewStdDevRadiance700_705
  • time_offset
  • SkyVariabilityAveragesCh1
  • SkyBrightnessTempSpectralAveragesCh2
  • SkyBrightnessTempSpectralAveragesCh1
  • SkyVariabilityAveragesCh2
  • ABBtopTemp
  • sceneMirPosEncoder
  • ABBviewStdDevRadiance675_680
  • HBB2minNENEstimateNo2Ch1
  • HBB2minNENEstimateNo2Ch2
  • skyViewStdDevRadiance2295_2300
  • elevatedLayerAirTemp700_705
  • LWskyNENAcceptable
  • HBBviewStdDevRadiance2510_2515
  • rawTimeHHMMSS
  • skyViewStdDevRadiance700_705
  • ABBviewStdDevRadiance2510_2515
  • ABBviewStdDevRadiance2282_2287
  • atmosphericPressure
  • ABBViewStdDevRadiance2295_2300
  • SWskyNENAcceptable
  • hatchOpen
  • interferometerSecondPortTemp
  • skyViewStdDevRadiance2510_2515
  • HBB2minNENEstimateNo1Ch2
  • base_time
  • HBB2minNENEstimateNo1Ch1
  • coolerPowerSupplyTemp
  • longwaveWindowRadiance985_990
  • mirrorMotorTemp
  • longwaveWindowAirTemp985_990
  • elevatedLayerAirTemp2282_2287
  • ABBViewStdDevRadiance675_680
  • HBBStable
  • HBBviewStdDevRadiance675_680
  • HBBViewStdDevRadiance2282_2287
  • hatchIndicator
  • Altitude
  • coolerCompressorTemp
  • HBBViewStdDevRadiance985_990
  • motorDriverTemp
  • skyViewStdDevRadiance675_680
  • SkyRadianceSpectraAveragesCh1
  • SkyRadianceSpectraAveragesCh2
  • HBBtempDrift
  • surfaceLayerRadiance675_680
  • HBBviewStdDevRadiance2295_2300
more

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