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MHS PRT Noise

MHS PRT Noise. Tom Kleespies NESDIS/STAR 301-763-8136x126 thomas.j.kleespies@noaa.gov Ken Jarva Consultant to Science and Technology Corporation Kenneth.Jarva@noaa.gov. METOP MHS Seems to Have Excessive Dropouts. Several per orbit, apparently randomly distributed. Analysis of errors.

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MHS PRT Noise

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  1. MHS PRT Noise Tom Kleespies NESDIS/STAR 301-763-8136x126 thomas.j.kleespies@noaa.gov Ken Jarva Consultant to Science and Technology Corporation Kenneth.Jarva@noaa.gov Calpop

  2. METOP MHS Seems to Have Excessive Dropouts Several per orbit, apparently randomly distributed Calpop

  3. Analysis of errors • The following is true for each instance: The Quality Indicator Bit Field (longword 7) was set to 90000000x, which means: "Do not use scan for product generation" and  "Insufficient data for calibration". The Scan Line Quality Flags (byte 31) was 28x, which means: "Some uncalibrated channel on this scan (see channel indicators)" and "Scan line was not calibrated because of bad or insufficient PRT data" The Calibration Quality Flags (bit 3, words 17-21, one for each channel) are all 8x which means: "all bad PRTs for this line." Calpop

  4. PRT Screening • gross limit check (270-320) • Any PRT that disagrees with two other PRTs by more than 0.2K is disregarded. • Surviving PRTs are compared with same PRTs from nearby scans. Those with differences > 0.2K are discarded. • If two or less PRTs survive, the data are rejected and the scan is not calibrated. Calpop

  5. PRT Standard Deviations (5 PRTs) Metop NOAA18 Metop PRTs have about twice the standard deviation as NOAA18 NSS.MHSX.M2.D07080.S0716.E0857.B0216869.SV Calpop NSS.MHSX.NN.D07080.S2322.E0104.B0945556.GC

  6. Options • Do nothing • Increase the screening threshold from 0.2K to TBD K for METOP Calpop

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