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CrIMSS Emissivity DR Status

CrIMSS Emissivity DR Status. Xu Liu, Dan Zhou NASA Langley Research Center Susan Kizer SSAI, Hampton, VA 23681 May20, 2013 CrIMSS EDR Telecon. Status. Two DRs written Increase emissivity hinge points Use emissivity map as first guess Implemented the first DR Very minimum code changes

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CrIMSS Emissivity DR Status

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  1. CrIMSS Emissivity DR Status Xu Liu, Dan Zhou NASA Langley Research Center Susan Kizer SSAI, Hampton, VA 23681 May20, 2013 CrIMSS EDR Telecon

  2. Status • Two DRs written • Increase emissivity hinge points • Use emissivity map as first guess • Implemented the first DR • Very minimum code changes • The CrIMSS offline code successfully run with 15 emissivity hinge points • In the process of evaluating the retrieval results • Should improve ozone product • Will need to see if more points are needed for band3 • Have developed tools for interpolating and generating emissivity LUTs • Evaluate performance impact using both LaRC (Dan) and UW ( Eva) emissivity databases • Will proceed to DR2 once we have defined the new hinge points • The global map will be saved at newly selected hinge points • Stratify according to lat/long/time • Should provide better first guess to CC

  3. Dan’s Jul. MMC emissivity at 890 cm-1ε890 .

  4. CrIMSS Retrieved vs IASI emissivity

  5. Increase surface emissivity hinge points • freq=[680., 780., 815., 850., 900., 925., 950., 1214., 1245., 1300., 2200., 2550.]; • freq=[680., 780., 815., 850., 900., 925., 950., 1050, 1080., 1095.,1214., 1245., 1300., 2200., 2550.];

  6. What’s next • Finalize the hinge points locations • Edit DR to describe specific code changes and LUT changes • CrIMSS-CLIM-LUT • CrIMSS-IR-ATM-NOISE • CrIMSS-SFC-EMIS-LUT • Deliver the new LUTs to all team members • Evaluate EDR performance impact • To start to prepare for global emissivity map • Generate new LUT (CrIMSS-IR-SFC-EMIS-MAP?) • Trade spatial resolution and temporal resolution of the initial guess • Evaluate performance improvement using focus day data • Update the ATMS and CrIS bias LUTs • CrIMSS-MW-RTM-BIAS-LUT • CrIMSS-IR-RTM-BIAS-LUT

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