| Description: | See below for details of reprocessing that was completed on 201410/24. Original DQR
category: 4 (Red, Incorrect).
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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 |