CRTM DevelopmentPaul van Delst, Quanhua Liu, Yong Chen, David Groff

10th JCSDA Workshop, 10-12 October, 2012

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OutlineCRTM v2.1 ReleaseCRTM v2.2 Release plansCRTM v3.0 Release plans

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CRTM v2.1 Release(finally!)

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AcknowledgementsThanks 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-MadisonLouis Grasso and Yoo-Jeong Noh at CIRA/CSU-Fort CollinsTomoko Koyama abd Dan Birkenheuer at NOAA/ESRLXingming Liang and Alex Ignatov fo the MICROS team at

NESDIS/STARAndrew Collard, John Derber, and the entire GSI team at

NCEP/EMCThere are also many others that are not mentioned here.

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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.

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Updated microwave sea surface emissivity model: FASTEM5Initial 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.

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AMSU-A Ch1, FASTEM5/4/1

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AMSU-A Ch2, FASTEM5/4/1

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AMSU-A Ch3, FASTEM5/4/1

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AMSU-A Ch15, FASTEM5/4/1

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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.

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AMSU-A Ch1, Impact of MWLSEM

Control Experiment

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AMSU-A Ch2, Impact of MWLSEM

Control Experiment

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AMSU-A Ch3, Impact of MWLSEM

Control Experiment

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AMSU-A Ch4, Impact of MWLSEM

Control Experiment

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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.

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Impact of NLTE in IASI spectraSee Yong Chen’s poster for details.

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Implementation of SOI algorithmInvolved 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.

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CRTM v2.2 Release Plans

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Planned v2.2 updatesSingle/double precision compilation switchModification to TauCoeff type definitions so that I/O is

precision-switch independentScattering indicator (T. Greenwald, CIMSS/SSEC/UW-Madison)32-stream cloud/aerosol LUT capabilityAOD 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 updateLand surface emissivity database interface

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CRTM v3.0 Release Plans

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Planned v3.0 updatesImplementation 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.

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Questions?