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

1. Outline CRTM v2.1 Release CRTM v2.2 Release plans
JCSDA Workshop, October, 2012

2. CRTM v2.1 Release
(finally!)
JCSDA Workshop, October, 2012

3. 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 Ignatov fo 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, October, 2012

4. 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, October, 2012

5. 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, October, 2012

6. AMSU-A Ch1, FASTEM5/4/1
JCSDA Workshop, October, 2012

7. AMSU-A Ch2, FASTEM5/4/1
JCSDA Workshop, October, 2012

8. AMSU-A Ch3, FASTEM5/4/1
JCSDA Workshop, October, 2012

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

10. 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, October, 2012

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

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

13. AMSU-A Ch3, Impact of MWLSEM
Control
Experiment
JCSDA Workshop, October, 2012

14. AMSU-A Ch4, Impact of MWLSEM
Control
Experiment
JCSDA Workshop, October, 2012

15. 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, October, 2012

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

17. 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, October, 2012

18. CRTM v2.2 Release Plans
JCSDA Workshop, October, 2012

19. 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 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, October, 2012

20. CRTM v3.0 Release Plans
JCSDA Workshop, October, 2012

21. 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, October, 2012

22. Questions?
JCSDA Workshop, October, 2012