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CNRM Emissivity Estimates

Data available
  • The emissivity model described in Karbou 2005 (IEEE TGRS) is available: it allows the estimation of land surface emissivity at AMSU frequencies with an angular parametrization (emissivity at different fields of view). Karbou, F., 2005, Two microwave land emissivity parameterizations suitable for AMSU observations, IEEE Trans on Geoscience and Remote sensing, vol. 43, no 8, pp. 1788-1795
  • The emissivity atlases are available for AMSU and SSMI (monthly means, weekly means (under request)) from 2006 to date.
  • The so-called "dynamical method" for deriving the land surface emissivity at microwave frequencies is interfaced with RTTOV in the common core code of ARPEGE (Météo-France) and IFS (ECMWF) and will be tested with CRTM in the near future.
  • monthly mean climatologies from 2006 onwards will be added to the website soon.
Developer
Fatima Karbou, CNRM/GAME, Météo-France
Scientific documentation
  • Karbou, F., C. Prigent, L. Eymard, and J. Pardo, 2005, Microwave land emissivity calculations using AMSU-A and AMSU-B measurements, IEEE Trans on Geoscience and Remote sensing, vol. 43, no. 5, pp. 948-959.
  • Karbou, F., E. Gérard, and F. Rabier, 2006, Microwave land emissivity and skin temperature for AMSU-A and -B assimilation over land, Q. J. R. Meteorol. Soc., ref. 05/216, vol. 132, No. 620, Part A, pp. 2333-2355(23).
  • http://www.cnrm.meteo.fr/gmap/mwemis/mwemis.html
Selected references
Full description in:
Karbou et al. 2006 (QJRMS) Karbou, F., E. Gérard, and F. Rabier, 2006, Microwave Land Emissivity and Skin Temperature for AMSU-A & -B Assimilation Over Land, Q. J. R. Meteorol. Soc., vol. 132, No. 620, Part A, pp. 2333-2355(23)
Other references:
  • Karbou, F., 2007, Treatment of surface emissivity in satellite data assimilation, Proceeding of the ECMWF seminar on Recent Developments in the Use of Satellite Observations in Numerical Weather Prediction.
  • Karbou, F., E. Gérard, F. Rabier, 2010a, Global 4D-Var assimilation and forecast experiments using AMSU observations over land. Part-I: Impact of various land surface emissivity parameterizations, Weather and Forecasting, 25, 5-19.
  • Karbou, F., F. Rabier, J-P. Lafore, J-L. Redelsperger, O. Bock, 2010b, Global 4D-Var assimilation and forecast experiments using AMSU observations over land. Part II: Impact of assimilating surface sensitive channels on the African Monsoon during AMMA, Weather and Forecasting, 25, 20-36.
How to access information
Available from http://www.cnrm.meteo.fr/gmap/mwemis/get_data.html.
Most of the data is available by ftp. Users can send emails for specific requests (specific periods, sensors, unstantanous, weekly average, etc) to fatima.karbou@meteo.fr
Format information
ASCII format: Longitude, Latitude, and then for all frequencies: Mean-emissivity, Standard-deviation, number of observations in each grid cell
NETCDF format
Date project began or when data was first available
Project began early 2007. Data available for dates from 2005 onwards.
Is development ongoing?
Yes
Date information last checked and by whom, and date for next check and by whom
April 2010, Fatima Karbou
Confirmed users of database
Some users:
  • Sreerekha Thonipparambil, Steve English, Met-Office
  • Blazej Krzeminski, ECMWF
  • Toshi Matsui, NASA Goddard Space Flight Center
  • Boon Lim, University of Michigan
  • Banghua Yan, Fuzhong Weng, NOAA/NESDIS
  • Charles Desportes, Estelle Obligis, CLS
  • Yubao Qiu, Chinese Academy of Sciences
  • Elisabetta Bocci, Perugia University
  • Nai-Yu Wang, University of Maryland/ESSIC
  • Devendra Singh, Department of Science and Technology India
  • Sabatino Di Michele, ECMWF
  • Ralph Ferraro, NOAA