DQRID : D160909.24
Start DateStart TimeEnd DateEnd Time
08/24/20161800Open Ended-1
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Subject:
ENA/TRACEGAS/C1 - baseline (or span) shift of ~3-5%
DataStreams:enaaoscoC1.a1, enaaoscoC1.00, enaaoscoC1.01, enaaoscoC1.b1
Description:
Following a power outage, the baseline signals for CO, H2O and N2O all shifted 
approximately 3-5% higher.  It doesn't seem this is an atmospheric change at this time.  Ironically 
the next standard addition calibration was spot on (previous ones had been 3-5% low).  
Ironically, communications to the mass flow controllers running the automatic calibrations 
failed after a single post power outage calibration.  While the reported data is 
affected, it will be difficult to tell how much.  The September data set should shed light on this.
Suggestions: 
Consider data to be 3-5% low prior to this period?
Measurements:enaaoscoC1.01:
  • Nitrous oxide (N2O) mixing ratio corrected for water vapor concentration and
    calculated with nominal sensitivity correction(n2o_dry)
  • Actual mass flow through mass flow controller 1(mass_flow_through_MFC_1)
  • Actual mass flow through MFC #2(mass_flow_through_MFC_2)
  • Cell sample pressure(gas_pressure)
  • base time in epoch(base_time)
  • time_in_seconds_since_volume_start(time)
  • Carbon monoxide concentration(co)
  • Measured water content(h2o)
  • Nitrous oxide (N2O) mixing ratio calculated with nominal sensitivity correction(n2o)
  • Valve position mass flow controller 2(valve_position_MFC_2)
  • Valve position for mass flow controller 1(valve_position_MFC_1)
  • Ambient temperature of instrument(ambient_temperature)
  • Set point for mass flow controller 2(set_point_for_MFC_2)
  • Set point for Mass Flow Controller #1(set_point_for_MFC_1)
  • lon(lon)
  • Carbon monoxide (CO) mixing ratio corrected for water vapor concentration and
    calculated with nominal sensitivity correction(co_dry)
  • Cell sample temperature(gas_temperature)
  • -180.0 - +180.0(alt)
  • North Latitude(lat)
  • Time offset from base_time(time_offset)
more
enaaoscoC1.a1:
  • Cell sample pressure(gas_pressure)
  • Ambient temperature of instrument(ambient_temperature)
  • Time offset from base_time(time_offset)
  • Set point for Mass Flow Controller #1(set_point_for_MFC_1)
  • Set point for mass flow controller 2(set_point_for_MFC_2)
  • -180.0 - +180.0(alt)
  • lon(lon)
  • Carbon monoxide (CO) mixing ratio corrected for water vapor concentration and
    calculated with nominal sensitivity correction(co_dry)
  • time_in_seconds_since_volume_start(time)
  • Measured water content(h2o)
  • Nitrous oxide (N2O) mixing ratio calculated with nominal sensitivity correction(n2o)
  • Valve position mass flow controller 2(valve_position_MFC_2)
  • Valve position for mass flow controller 1(valve_position_MFC_1)
  • Actual mass flow through MFC #2(mass_flow_through_MFC_2)
  • base time in epoch(base_time)
  • North Latitude(lat)
  • Nitrous oxide (N2O) mixing ratio corrected for water vapor concentration and
    calculated with nominal sensitivity correction(n2o_dry)
  • Cell sample temperature(gas_temperature)
  • Actual mass flow through mass flow controller 1(mass_flow_through_MFC_1)
  • Carbon monoxide concentration(co)
more
enaaoscoC1.00:
  • (Raw data stream - documentation not supported)
more
enaaoscoC1.b1:
  • Carbon monoxide (CO) mixing ratio corrected for water vapor concentration and
    calculated with nominal sensitivity correction(co_dry)
  • lon(lon)
  • Measured water content(h2o)
  • Cell sample temperature(gas_temperature)
  • Nitrous oxide (N2O) mixing ratio calculated with nominal sensitivity correction(n2o)
  • Time offset from base_time(time_offset)
  • Quality check results on field: Water vapor mixing ratio calculated with nominal
    sensitivity correction(qc_h2o)
  • Set point for mass flow controller 2(set_point_for_MFC_2)
  • Set point for Mass Flow Controller #1(set_point_for_MFC_1)
  • Quality check results on field: Nitrous oxide (N2O) mixing ratio corrected for
    water vapor concentration and calculated with nominal sensitivity correction(qc_n2o_dry)
  • Quality check results on field: Carbon monoxide (CO) mixing ratio corrected for
    water vapor concentration and calculated with nominal sensitivity correction(qc_co_dry)
  • Quality check results on field: Carbon monoxide (CO) mixing ratio calculated
    with nominal sensitivity correction(qc_co)
  • Nitrous oxide (N2O) mixing ratio corrected for water vapor concentration and
    calculated with nominal sensitivity correction(n2o_dry)
  • North Latitude(lat)
  • Quality check results on field: Nitrous oxide concentration(qc_n2o)
  • base time in epoch(base_time)
  • Actual mass flow through mass flow controller 1(mass_flow_through_MFC_1)
  • Actual mass flow through MFC #2(mass_flow_through_MFC_2)
  • Seconds after last calibration(seconds_after_calibration)
  • Carbon monoxide concentration(co)
  • Valve position mass flow controller 2(valve_position_MFC_2)
  • Ambient temperature of instrument(ambient_temperature)
  • Valve position for mass flow controller 1(valve_position_MFC_1)
  • -180.0 - +180.0(alt)
  • time_in_seconds_since_volume_start(time)
  • Cell sample pressure(gas_pressure)
more

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