Data Quality Reports for Session: 154009 User: r1von1glas Completed: 10/25/2013

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D120302.2SGP/SIRS/C1 - Reprocess: Incorrect downwelling longwave calibration coefficientsgpsirs20sC1.a0, sgpsirsC1.b1
D120404.1SGP/SIRS/C1 - Reprocess: Incorrect downwelling longwave calibration coefficientsgpsirs20sC1.a0, sgpsirsC1.b1


DQRID : D120302.2
Start DateStart TimeEnd DateEnd Time
06/14/2011173001/04/20122045
Subject:
SGP/SIRS/C1 - Reprocess: Incorrect downwelling longwave calibration coefficient
DataStreams:sgpsirs20sC1.a0, sgpsirsC1.b1
Description:
Calibration coefficient for downwelling longwave was incorrect for the specified period.

To correct the one minute data b1 datastream follow the procedure below:
1) Obtain the following variables from the 20s datastream for each one minute of the 
affected time range:
  inst_down_long_shaded_dome_resist (Rd)
  inst_down_long_shaded_case_resist (Rc)
  inst_down_long_hemisp_shaded_tp (tpDIR_mV)
                                         
2) using the 20s tp voltage in mV convert to uV.
  tpDIR[uV] = inst_down_long_hemisp_shaded_tp[mV]*1000[uV/mV]

3) For each 20s data entry convert Rd and Rc to temperature
  Td =1/ (a0 + (a1*LN (Rd*1000) + (a2*LN (Rd*1000)^3)))
  Tc = 1/ (a0 + (a1*LN (Rc*1000) + (a2*LN (Rc*1000)^3)))
  where a0 = 0.0010295 
        a1 = 0.0002391
        a2 = 0.0000001568

4) Apply for each 20s data entry: (correct k1=0.2762)
  WinDIR(W/m2)= [0.2762*tpDIR] + Sigma*Tc^4 -4*Sigma*(Td^4 - Tc^4)
  where, Sigma = 5.6704E-8 (Stefan-Boltzman Const)
                                      
5) Generate new 1 minute average from the 3 20-second measurements
Measurements:sgpsirs20sC1.a0:
  • inst_down_long_shaded_dome_resist
  • inst_down_long_shaded_case_resist
  • Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer1)(inst_down_long_hemisp_shaded_tp)
sgpsirsC1.b1:
  • Downwelling Longwave Hemispheric Irrad., Shaded Ventilated Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • down_long_hemisp_shaded_std
  • Downwelling Longwave Hemispheric Irrad., Shaded Ventilated Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • inst_down_long_shaded_case_temp
  • Downwelling Longwave Hemispheric Irradiance, Shaded Ventilated Pyrgeometer(down_long_hemisp_shaded)
  • inst_down_long_shaded_dome_temp

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DQRID : D120404.1
Start DateStart TimeEnd DateEnd Time
02/04/2012000002/29/20121731
Subject:
SGP/SIRS/C1 - Reprocess: Incorrect downwelling longwave calibration coefficient
DataStreams:sgpsirs20sC1.a0, sgpsirsC1.b1
Description:
The calibration coeff and serial number for the down_long_hemisp_shaded was incorrect 
during the period specified. 

Correct Instrument serial number = 30010F3 
                              K1 = 0.3125
Incorrect Instrument serial number = 30690F3 
                                K1 = 0.2762
 
Data will be reprocessed.

To correct the one minute data b1 datastream follow the procedure below:
1) Obtain the following variables from the 20s datastream for each one minute of the 
affected
time range:
  inst_down_long_shaded_dome_resist (Rd)
  inst_down_long_shaded_case_resist (Rc)
  inst_down_long_hemisp_shaded_tp (tpDIR_mV)
					 
2) using the 20s tp voltage in mV convert to uV.
  tpDIR[uV] = inst_down_long_hemisp_shaded_tp[mV]*1000[uV/mV]

3) For each 20s data entry convert Rd and Rc to temperature
  Td =1/ (a0 + (a1*LN (Rd*1000) + (a2*LN (Rd*1000)^3)))
  Tc = 1/ (a0 + (a1*LN (Rc*1000) + (a2*LN (Rc*1000)^3)))
  where a0 = 0.0010295 
	a1 = 0.0002391
	a2 = 0.0000001568

4) Apply for each 20s data entry: (correct k1=0.3125)
  WinDIR(W/m^2)= [0.3125*tpDIR] + Sigma*Tc^4 -4*Sigma*(Td^4 - Tc^4)
  where, 
        WinDIR = Corrected down_long_hemisp_shaded (W/m^2)
        Sigma =	5.6704E-8 (Stefan-Boltzman Constant)

				      
5) Generate new 1 minute average from the three 20-second measurements
Measurements:sgpsirs20sC1.a0:
  • inst_down_long_shaded_dome_resist
  • inst_down_long_shaded_case_resist
  • Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer1)(inst_down_long_hemisp_shaded_tp)
sgpsirsC1.b1:
  • Downwelling Longwave Hemispheric Irrad., Shaded Ventilated Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • down_long_hemisp_shaded_std
  • Downwelling Longwave Hemispheric Irrad., Shaded Ventilated Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • inst_down_long_shaded_case_temp
  • Downwelling Longwave Hemispheric Irradiance, Shaded Ventilated Pyrgeometer(down_long_hemisp_shaded)
  • inst_down_long_shaded_dome_temp

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