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2018WCRPspon col July2018 01 1

A Cyrille: Land surface temperature based on SSM/I and MODIS brightness temperatures over circumpolar Arctic


This presentation was held at the DUE Permafrost 2014 workshop, 12th of Febuary 2014, Frascati, Italy


André, Cyrille
LSCE-IPSL, Gif-sur-Yvette France

Passive microwave and thermal infrared data were combined to estimate land surface temperature during summer snow free periods over northern high latitudes. The methodology is based on the use of the SSM/I 37 GHz measurements at both vertical and horizontal polarizations and on a 25kmx25km grid size (Royer et al., 2010). The separation of temperature and emissivity is obtained by an empirical relationship between the emissivities at both polarizations, calibrated at pixel scale, using MODIS temperatures and the ESA-CCI land cover product. Air temperature reanalysis provided from the ECMWF at 0.5° resolution and 3-hour intervals have been used to interpolate the twice daily measurements to hourly estimates. The time series have been produced for the entire Arctic region (latitudes larger than 45°N) and used to produce daily temperatures as well as permafrost maps. The data processing methodology will be presented as well as the novel dataset.

Keywords: Land surface temperature retrieval from space, Data fusion, Data assimilation





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