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CRTM Development

CRTM Development. Paul van Delst, Quanhua Liu, Yong Chen, David Groff 10 th JCSDA Workshop, 10-12 October, 2012. Outline. CRTM v2.1 Release CRTM v2.2 Release plans CRTM v3.0 Release plans. CRTM v2.1 Release. (finally!). Acknowledgements.

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CRTM Development

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  1. CRTM Development Paul van Delst, Quanhua Liu, Yong Chen, David Groff 10th JCSDA Workshop, 10-12 October, 2012

  2. Outline CRTM v2.1 Release CRTM v2.2 Release plans CRTM v3.0 Release plans JCSDA Workshop, 10-12 October, 2012

  3. CRTM v2.1 Release (finally!) JCSDA Workshop, 10-12 October, 2012

  4. Acknowledgements Thanks are due to a great many people for help with v2.1 development. Todd Schaack, Brad Pierce, Jim Davies, Tom Greenwald, Eva Borbas, and Chris Moeller at CIMSS/SSEC/UW-Madison Louis Grasso and Yoo-Jeong Noh at CIRA/CSU-Fort Collins Tomoko Koyama abd Dan Birkenheuer at NOAA/ESRL Xingming Liang and Alex Ignatovfo the MICROS team at NESDIS/STAR Andrew Collard, John Derber, and the entire GSI team at NCEP/EMC There are also many others that are not mentioned here. JCSDA Workshop, 10-12 October, 2012

  5. CRTM v2.1 Release; What’s New • New science • Updated microwave sea surface emissivity model • Updated microwave land surface emissivity model • Non-LTE for hyperspectral infrared sensors • Successive order of interaction radiative transfer algorithm • New functionality • Aerosol optical depth functions • Channel subsetting • Number-of-streams option • Scattering switch option • Aircraft instrument capability • Options structure I/O • Interface changes • Surface type specification changes • Emissivity model initialisation file changes • Other • Code refactoring and computational speedup. JCSDA Workshop, 10-12 October, 2012

  6. Updated microwave sea surface emissivity model: FASTEM5 Initial implementation of FASTEM4 (May 2011, initial v2.1 release candidate) showed an anomalous wind speed dependence. Tracked to missing small-scale correction, foam coverage. Correction of these, as well as re-fitting the polynomials for the large-scale correction, gave us FASTEM5. Offline results are equivocal; good for lower frequency surface channels, not as much for higher frequency channels. JCSDA Workshop, 10-12 October, 2012

  7. AMSU-A Ch1, FASTEM5/4/1 JCSDA Workshop, 10-12 October, 2012

  8. AMSU-A Ch2, FASTEM5/4/1 JCSDA Workshop, 10-12 October, 2012

  9. AMSU-A Ch3, FASTEM5/4/1 JCSDA Workshop, 10-12 October, 2012

  10. AMSU-A Ch15, FASTEM5/4/1 JCSDA Workshop, 10-12 October, 2012

  11. Updated microwave land surface emissivity model (W. Zheng) The model now uses more information about the surface characteristics. Soil and vegetation types (those defined in the GFS), and leaf area index (LAI) are now used. Impacts of update are smaller biases, RMSEs, and more assimilated observations. JCSDA Workshop, 10-12 October, 2012

  12. AMSU-A Ch1, Impact of MWLSEM Experiment Control JCSDA Workshop, 10-12 October, 2012

  13. AMSU-A Ch2, Impact of MWLSEM Experiment Control JCSDA Workshop, 10-12 October, 2012

  14. AMSU-A Ch3, Impact of MWLSEM Experiment Control JCSDA Workshop, 10-12 October, 2012

  15. AMSU-A Ch4, Impact of MWLSEM Experiment Control JCSDA Workshop, 10-12 October, 2012

  16. Non-LTE (Y. Han) Implementation in May 2011 (initial v2.1 release candidate). Only implemented for hyperspectral infrared sensors; IASI, CrIS, and AIRS. Correction of these, as well as re-fitting the polynomials for the large-scale correction, gave us FASTEM5. Offline results are equivocal; good for lower frequency surface channels, not as much for higher frequency channels. JCSDA Workshop, 10-12 October, 2012

  17. Impact of NLTE in IASI spectra • See Yong Chen’s poster for details. JCSDA Workshop, 10-12 October, 2012

  18. Implementation of SOI algorithm Involved refactoring of the CRTM RTSolution modules. We now have specific SOI, and ADA, RTSolution modules. Initial characterisation indicates for less scattering, SOI results agree with, and computational speeds are comparable to, ADA. For optically thicker clouds/aerosols, ADA is still faster. Characterisation is continuing. JCSDA Workshop, 10-12 October, 2012

  19. CRTM v2.2 Release Plans JCSDA Workshop, 10-12 October, 2012

  20. Planned v2.2 updates Single/double precision compilation switch Modification to TauCoeff type definitions so that I/O is precision-switch independent Scattering indicator (T. Greenwald, CIMSS/SSEC/UW-Madison) 32-stream cloud/aerosol LUT capability AOD modules for CMAQ 4.7.1 aerosols. ATMS snow/ice emissivity model (M. Chen, JCSDA) Cloud fraction capability (M-J. Kim, CIRA/JCSDA) “TauProd” processing update Land surface emissivity database interface JCSDA Workshop, 10-12 October, 2012

  21. CRTM v3.0 Release Plans JCSDA Workshop, 10-12 October, 2012

  22. Planned v3.0 updates • Implementation of threading in CRTM. • Preliminary proof-of-concept implemented. • Specification of fractional coverage of subtypes in the input Surface structure. Interface change. • Specification of soil temperature and moisture profiles in Surface structure. Interface change. • Update fundamental physical constants in LBL and CRTM modules to the 2010 CODATA recommended values.Impacts all SpcCoeff data, as well as TauCoeff generation. JCSDA Workshop, 10-12 October, 2012

  23. Questions? JCSDA Workshop, 10-12 October, 2012

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