CRTM Development Paul van Delst Quanhua Liu Yong

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

Outline CRTM v 2. 1 Release CRTM v 2. 2 Release plans CRTM v 3. 0 Release plans 1 JCSDA Workshop, 10 -12 October, 2012

CRTM v 2. 1 Release (finally!) 2 JCSDA Workshop, 10 -12 October, 2012

Acknowledgements Thanks are due to a great many people for help with v 2. 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 Ignatov fo the MICROS team at NESDIS/STAR Andrew Collard, John Derber, and the entire GSI team at NCEP/EMC There also many others that are not mentioned here. 3 JCSDA Workshop, 10 -12 October, 2012

CRTM v 2. 1 Release; What’s 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. 4 JCSDA Workshop, 10 -12 October, 2012

Updated microwave sea surface emissivity model: FASTEM 5 Initial implementation of FASTEM 4 (May 2011, initial v 2. 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 FASTEM 5. Offline results are equivocal; good for lower frequency surface channels, not as much for higher frequency channels. 5 JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 1, FASTEM 5/4/1 6 JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 2, FASTEM 5/4/1 7 JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 3, FASTEM 5/4/1 8 JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 15, FASTEM 5/4/1 9 JCSDA Workshop, 10 -12 October, 2012

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. 10 JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 1, Impact of MWLSEM Control 11 Experiment JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 2, Impact of MWLSEM Control 12 Experiment JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 3, Impact of MWLSEM Control 13 Experiment JCSDA Workshop, 10 -12 October, 2012

AMSU-A Ch 4, Impact of MWLSEM Control 14 Experiment JCSDA Workshop, 10 -12 October, 2012

Non-LTE (Y. Han) Implementation in May 2011 (initial v 2. 1 release candidate). Only implemented for hyperspectral infrared sensors; IASI, Cr. IS, and AIRS. Correction of these, as well as re-fitting the polynomials for the large-scale correction, gave us FASTEM 5. Offline results are equivocal; good for lower frequency surface channels, not as much for higher frequency channels. 15 JCSDA Workshop, 10 -12 October, 2012

Impact of NLTE in IASI spectra See Yong Chen’s poster for details. 16 JCSDA Workshop, 10 -12 October, 2012

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. 17 JCSDA Workshop, 10 -12 October, 2012

CRTM v 2. 2 Release Plans 18 JCSDA Workshop, 10 -12 October, 2012

Planned v 2. 2 updates Single/double precision compilation switch Modification to Tau. Coeff 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) “Tau. Prod” processing update Land surface emissivity database interface 19 JCSDA Workshop, 10 -12 October, 2012

CRTM v 3. 0 Release Plans 20 JCSDA Workshop, 10 -12 October, 2012

Planned v 3. 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 Spc. Coeff data, as well as Tau. Coeff generation. 21 JCSDA Workshop, 10 -12 October, 2012

Questions? 22 JCSDA Workshop, 10 -12 October, 2012