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IR Emissivity Updates For CrIMSS EDR; NASA LaRC Efforts. Susan Kizer Xu Liu NASA Langley Research Center Suomi NPP CrIMSS EDR Cal/Val Telecon August 22, 2013. Background Last Cal/Val Meeting Discussion. Initial Efforts Reported In Discussion During August 8, 2013 Cal/Val Telecon

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IR Emissivity Updates For CrIMSS EDR; NASA LaRC Efforts

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IR Emissivity Updates For CrIMSS EDR; NASA LaRC Efforts

Susan Kizer

Xu Liu

NASA Langley Research Center

Suomi NPP CrIMSS EDR Cal/Val Telecon

August 22, 2013


BackgroundLast Cal/Val Meeting Discussion

Initial Efforts Reported In Discussion During August 8, 2013 Cal/Val Telecon

  • Baseline – MX7.1 CrIMSS EDR LaRC offline code

  • Tested an updated CLIM LUT with updated covariance matrix, eof, background for 12 HP, 15 HP, and 16 HP

  • Tested using data date 05/15/2012, 107 granules

    • Did not see improvement in convergence rates, statistics (RMS, stddev, bias), or IR+MW chisq

    • Decided that a larger data set may be needed

  • Tested using data date 09/20/2012, 2696 granules

    • Targeted reduction of IR+MW chisq values over desert land

  • Tested new 16 HP setup with new 1st guess IR emissivity and reflectivity values over land

    • A six-year monthly average of IASI data was provided by Dan Zhou

      Feedback/Recommendations

  • Hold to first guess and performance looks better – Eric Maddy

  • After cloud clearing MW surface performance so poor. Cloud clearing over desert is poor. Pull out clear footprints, turn off cloud clearing. – Evan Fishbein

  • Turn off emissivity retrieval – Sung-Yung Lee

  • During validation of AIRS (Oklahoma site), restricted retrievals to those that agree and RMS statistics of H2O in boundary layer improved. Have a validation data set, start with Nick’s sondes. – Bob Knuteson


BackgroundEmissivity 12, 15, 16 Hingepoints

Sample of retrieved emissivity for the purpose of showing the location of hinge points

Chose an FOR at 14.7 ° Latitude, 45.7° Longitude (Arabian Desert)


Emissivity LW Sample Data Date 05/15/2012

Emissivity MW Sample Data Date 05/15/2012

Emissivity SW Sample Data Date 05/15/2012


Current Progress

  • Pull out and investigate only clear scenes.

  • Investigating keeping the IR emissivity & reflectivity fixed at first guess values; do not let them change during retrieval.


Current ProgressClear Scenes For 09/20/2012

Approximately 1.4% of total FORs

Using CrIMSS EDR offline MX7.1


Current Progress – Clear Sky Only Statistics 09/20/2012Clear

MW+IR Baseline; MW+IR 16 HP; MW Only Baseline; MW Only 16 HP

Ocean

Land


Continuing Efforts

  • Continue to evaluate IR emissivity for clear sky only

    • Review clear sky determination

  • Test when first guess emissivity/reflectivity is fixed – does not change in retrieval

  • Consult with CIMSS for collaboration


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