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Table 1 Instrument Characteristics of HIRS and IASI onMetOp Satellite
HIRS IASI
Spectral Coverage 19 IR channels (670cm-1 ~ 2663cm-1) 8461 channels (546 cm-1 ~ 2760cm-1)
Instantaneous Field of view 0.70, 10km at nadir 0.80, 12km at nadir
Scan rate 6.4 seconds 8 seconds
Cross-track scan coverage ±49.50, 56 footprints per scan-line Spectral Calibration: Atmospheric spectral feature Radiometric Cal: Space-view, blackbody

Table 2 Empirical values of non-linearity coefficient, pre-launch measured values of non-linearity coefficient, and the channel dynamical ranges of the HIRS long-wave CO2 channels and window channel for the MetOp orbit (06:41 November 23, 2009)
CH Blackbody Bias (K) SRF shift (cm-1) Optimal Non-lin. Term Value (E-8)
4 0.142 -0.13 7.396
5 0.142 0.09 5.884
6 0.142 N/A 4.581
7 0.142 -0.15 4.913
8 0.142 N/A 6.767

Table3 Spectral Recalibration for Historical NOAA HIRS (SRF shifts in cm-1)
Ch4 Ch5 Ch7
N09 0.723389 2.06616 0.040283
N10 1.00995 1.06805 -1.10022
N11 1.65778 0.932068 0.38855
N12 0.47522 1.51721 -2.48132
N14 1.96619 2.54028 1.15857
N15 -0.37714 0.319641 1.47443
N16 0.668335 0.992065 1.08234
N17 0.211487 0.507263 -0.21936
N18 -0.46271 -0.3418 -0.86469
N19 -0.42322 -0.09735 -0.08008
M2 -0.13 0.09 -0.15

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