======  Reference Radiative Transfer Calculations  ======

 by [[../../../author/leannea|Leanne Avila]]   —  last modified  Oct 05, 2015 05:01 AM 

 

===== Spectroscopic databases =====

  * access the latest edition of the [[http://www.hitran.com/|HITRAN database]] and associated updates and documentation
  * access the latest versions of the [[http://ether.ipsl.jussieu.fr/etherTypo/?id=950|complete GEISA]] and [[http://ara.lmd.polytechnique.fr/htdocs-public/products/GEISA/HTML-GEISA/GeisaIasi_index|GEISA/IASI]] databases, and associated software and documentation.

==== New considerations for modellers ====

 

  * Ozone absorption in the AMSU 183 GHz channels should be included in RT models (brightness temperature variations are of the order of 0.5 K).
  * The 23 GHz water vapour absorption line half-widths have been revised based on results from the ARM site. A study of the resulting [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/UKMO_22GHz_report.pdf|impact for AMSU and SSMI radiances]] has been provided by Bill Bell and Stephen English (UKMO).
  * Following Action RTSP-13 from ITSC-18, an alternative formulation of the infrared water vapour continuum based on [[http://www.met.reading.ac.uk/caviar/|CAVIAR]] results is available as [[http://nwpsaf.eu/downloads/newman/ITWG_summary_report_WVcontinuum_Newman.pdf|a report]] and [[http://nwpsaf.eu/downloads/newman/ITSC-18_RTSP-13.zip|associated zip file]] (Stu Newman, UK Met Office).\\


===== Line-by-line radiative transfer models =====

Follow model-name links to access [[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/linebyline|full summaries of model features and development status]] provided by the model developers and updated after each ITSC by the RTSP working group.

[[mailto:Marco.Matricardi@ecmwf.int|Marco Matricardi]] (ECMWF) has prepared a report of intercomparisons between LBL codes used in the development of fast RT models for use in NWP. See [[http://old.ecmwf.int/publications/library/ecpublications/_pdf/tm/501-600/tm525.pdf|ECMWF Tech. Memo. 525, May 2007]] for details.

==== Infrared LbL models ====

|Model                                                                        |Principal developer                                                                                                  |Model website/contact                                                                  |
|LBLRTM                                                                       |Tony Clough (AER)                                                                                                    |[[http://rtweb.aer.com/lblrtm|LBLRTM website]]                                    |
|GENLN2                                                                       |Dave Edwards (NCAR)                                                                                                  |[[mailto:edwards@ncar.ucar.edu|email developer]]                                       |
|[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/linebyline#rfm|RFM]]      |Anu Duhdia (Univ. Oxford)                                                                                            |[[http://www.atm.ox.ac.uk/RFM/index|RFM website]]                                 |
|4A                                                                           |Noelle Scott (LMD)                                                                                                   |[[http://4aop.noveltis.com/|ARA-4A website]]                                           |
|[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/linebyline#kcarta|kCARTA]]|Sergio de Souza-Machado (UMBC)                                                                                       |[[http://asl.umbc.edu/pub/packages/kcarta|kCARTA website]]                        |
|sigma-IASI                                                                   |Guido Masiello (IMAA)                                                                                                |                                                                                       |
|Hartcode                                                                     |Ferenc Miskolczi (NASA,LaRC)                                                                                         |                                                                                       |
|FLBL                                                                         |Shawn Turner (MSC)                                                                                                   |                                                                                       |
|ARTS                                                                         |[[mailto:stefan.buehler@uni-hamburg.de|Stefan Buehler]]\\ \\ [[mailto:patrick.eriksson@chalmers.se|Patrick Eriksson]]|[[http://www.sat.ltu.se/arts|ARTS website]]                                            |
|[[http://cimss.ssec.wisc.edu/itwg/groups/rtwg/linebyline#kopra|KOPRA]]  |Michael Hoepfner (Univ. Kahlsruhe)                                                                                   |[[http://www-imk.fzk.de/asf/ame/publications/kopra_docu/kopra_docu|KOPRA website]]|
|GENSPECT                                                                     |? (Univ. Toronto)                                                                                                    |[[http://www.genspect.com/|GENSPECT website]]                                          |

====   ====

  * Marco Matricardi (ECMWF) has used the LBLRTM line-by-line model to generate a database of IASI spectra that include NLTE effects. NLTE effects have been computed using CO2 vibrational temperatures (including minor isotopologues) for 48 diverse atmospheric profiles and six values of the solar zenith angle assuming an IASI observation at nadir. Vibrational temperatures have been computed by [[mailto:puertas@iaa.es|Manuel Lopez Puertas]] (Instituto de Astrofisica de Andalucia). To obtain the NLTE spectra please contact [[mailto:Marco.Matricardi@ecmwf.int|Marco Matricardi.]]

====   ====

==== Microwave LbL models ====

|Model     |Principal developer           |Model website/contact                                      |
|MPM 89/92 |Hans Liebe (NTIA)             |                                                           |
|MonoRTM   |Tony Clough (AER)             |[[http://rtweb.aer.com/monortm_frame|MonoRTM website]]|
|Rosenkranz|? ()                          |                                                           |
|ATM       |? ()                          |                                                           |
|STRANSAC  |Noelle Scott (LMD)            |                                                           |
|ARTS      |Axel von Engeln (Univ. Bremen)|[[http://www.sat.uni-bremen.de/arts/|ARTS website]]        |