====== Fast Radiative Transfer Models ====== by [[../../../author/leannea|Leanne Avila]] — last modified Oct 21, 2014 07:21 AM ===== Guidance for fast radiative transfer model developments ===== Guidance on developing and testing tangent linear and adjoint code The lecture materials below are courtesy of Tom Kleespies. * [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/tl_ad_lectures/README.pdf|**Read Me file**]] (PDF) -- **Please read this PDF first** * [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/tl_ad_lectures/Forward_Lectures.pdf|Optical Path Transmittance: OPTRAN. Forward and Adjoint Modeling]] (PDF) * [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/tl_ad_lectures/TL_Lectures.pdf|Tangent Linear Coding]] (PDF) * [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/tl_ad_lectures/AD_Lectures.pdf|Adjoint Coding]] (PDF) * [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/tl_ad_lectures/K_Lectures.pdf|Jacobian (or K) Coding]] (PDF) ===== Advances in fast radiative transfer models for scattering atmospheres ===== * **Optical Property Databases for Clouds** (non-spherical implied) * [[http://www.ssec.wisc.edu/%7Ebaum/Cirrus/IceCloudModels|Bryan Baum's]] data. Ice clouds; Infrared only; specific instruments; a subset of Ping Yang's data. * [[http://cirrus.met.fsu.edu/research/scatdb|Guosheng Liu's]] data. Microwave only. * Ping Yang's data. Infrared only. Delivered to JCSDA and available on request from [[mailto:Fuzhong.Weng@noaa.gov?subject=JCSDA%20Cloud%20Optical%20Property%20Database|Fuzhong Weng]] * A dataset of optical properties for ice particles is available on request from [[mailto:anthony.baran@metoffice.gov.uk|Anthony Baran]]. The dataset contains optical properties for ice particles (absorption and scattering coefficients, ssa, assymetry parameter and phase function) at 72 wavelengths between 3 and 18 microns for 20662 different values of temperature and ice water content. * A dataset of optical properties for hexagonal column ice particles is available on request from [[mailto:marco.matricardi@ecmwf.int|Marco Matricardi]]. The optical properties have been computed using T-matrix and geometrical optics computations for 32 different particle  size distributions.\\ * **Optical Property Databases for Aerosols** * Ping Yang's data. Infrared only. Delivered to JCSDA and available on request from [[mailto:Fuzhong.Weng@noaa.gov?subject=JCSDA%20Aerosol%20Optical%20Property%20Database|Fuzhong Weng]] * The OPAC database of optical properties of aerosols is available from the [[http://ether.ipsl.jussieu.fr/etherTypo/?id=989|GEISA]] we site. * Recent refractive indices and size distributions for volcanic ash ([[http://onlinelibrary.wiley.com/doi/10.1029/2011JD016770/abstract|Millington et al. 2012]]) and Asian dust ( [[http://onlinelibrary.wiley.com/doi/10.1029/2012JD017466/abstract|Han et al. 2012]]) aerosol particles are available on request from [[mailto:james.hocking@metoffice.gov.uk|James Hocking]]. Details can be found in the RTTOV [[http://nwpsaf.eu/deliverables/rtm/docs_rttov11/rttov11_svr.pdf|science and validation report]].\\ ===== Fast model status summary ===== Follow model-name links to access [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus|full summaries of model features and development status]] provided by the model developers and updated after each ITSC by the RTSP working group. |Model |Supported sensors|Contact |Website | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#rttov|RTTOV]] |Multi-sensor * |Roger Saunders (UKMO) |[[http://nwpsaf.eu/deliverables/rtm/|Eumetsat NWP SAF website]] | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#crtm|CRTM]] |Multi-sensor * |Paul van Delst (NESDIS) |[[http://www.ssec.wisc.edu/%7Epaulv/Fortran90/CRTM/Developmental/|Paul van Delst's web documentation]]| |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#mscfast|MSCFAST]] |HIRS,GOES,AIRS |Louis Garand (MSC) |[[http://collaboration.cmc.ec.gc.ca/science/arma/intercomparison/desc_aesfast2.txt|more details]] | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#oss|OSS]] |AIRS |Jean-Luc Moncet (AER) | | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#sarta|SARTA]] |AIRS |Scott Hannon (UMBC) |[[http://asl.umbc.edu/pub/packages/sarta|SARTA website]] | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#pfaast|PFAAST]] | |Hal Woolf (CIMSS) | | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#gastro|Gastropod]] |AIRS |Vanessa Sherlock (NIWA) |[[http://gastro.sf.net/|Gastropod website]] | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#pcrtm|PCRTM]] |AIRS,IASI,NAST-I |Xu Liu (NASA) | | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#rtiasi|RTIASI]] |IASI |Marco Matricardi (ECMWF) | | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#lmd|LMD fast models]] | |Alain Chedin/Noelle Scott (LMD)| | |[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/faststatus#crtm_zeeman|Zeeman model]]|SSMIS |Yong Han (NESDIS) | | * see full summary for list of supported sensors ===== Utility Software ===== * Software for interpolating profiles and mapping of Jacobians from the fast RT layering to NWP vertical coordinates (TL/AD/Gradient) is now part of RTTOV-9. A stand-alone version of the software is available at:\\ http://exp-studies.tor.ec.gc.ca/e/paper_data/tstintavg_e.html\\ * [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/Profile_Utility/Main|Profile_Utility webpage]] containing Fortran95 code and documentation to perform units conversions and level-to-layer conversions on atmospheric quantities (Forward models only).