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CRTM v2.1 Release (finally!) JCSDA Workshop, 10-12 October, 2012
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CRTM DevelopmentPaul van Delst, Quanhua Liu, Yong Chen, David Groff
10th JCSDA Workshop, 10-12 October, 2012
JCSDA Workshop, 10-12 October, 20122
OutlineCRTM v2.1 ReleaseCRTM v2.2 Release plansCRTM v3.0 Release plans
JCSDA Workshop, 10-12 October, 20123
CRTM v2.1 Release(finally!)
JCSDA Workshop, 10-12 October, 20124
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.
JCSDA Workshop, 10-12 October, 20125
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, 20126
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.
JCSDA Workshop, 10-12 October, 20127
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
JCSDA Workshop, 10-12 October, 201210
AMSU-A Ch15, FASTEM5/4/1
JCSDA Workshop, 10-12 October, 201211
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, 201212
AMSU-A Ch1, Impact of MWLSEM
Control Experiment
JCSDA Workshop, 10-12 October, 201213
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
JCSDA Workshop, 10-12 October, 201216
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, 201217
Impact of NLTE in IASI spectraSee Yong Chen’s poster for details.
JCSDA Workshop, 10-12 October, 201218
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.
JCSDA Workshop, 10-12 October, 201219
CRTM v2.2 Release Plans
JCSDA Workshop, 10-12 October, 201220
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
JCSDA Workshop, 10-12 October, 201221
CRTM v3.0 Release Plans
JCSDA Workshop, 10-12 October, 201222
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.
JCSDA Workshop, 10-12 October, 201223
Questions?
