DQR ID | Subject | Data Streams Affected |
---|---|---|
D120302.2 | SGP/SIRS/C1 - Reprocess: Incorrect downwelling longwave calibration coefficient | sgpsirs20sC1.a0, sgpsirsC1.b1 |
D120404.1 | SGP/SIRS/C1 - Reprocess: Incorrect downwelling longwave calibration coefficient | sgpsirs20sC1.a0, sgpsirsC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/14/2011 | 1730 | 01/04/2012 | 2045 |
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:
sgpsirsC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/04/2012 | 0000 | 02/29/2012 | 1731 |
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:
sgpsirsC1.b1:
|