On the Methods for Recalibrating Geostationary Longwave Channels Using Polar Orbiting Infrared Sounders

Remote Sensing

Frank Rüthrich¹  Tim Hewison¹  VijuO. John¹  Jörg Schulz¹  Rob Roebeling¹  Reto Stöckli²  Tasuku Tabata³ 

[1] EUMETSAT, Eumetsat Allee 1, 64295 Darmstadt, Germany;Federal Office of Meteorology and Climatology MeteoSwiss, Climate Services, 8058 Zürich-Flughafen, Switzerland;JMA (Japan Meteorological Agency), Tokyo 100-8122, Japan;

关键词: fundamental climate data record;    recalibration;    prime correction;    validation;    scope-cm;    GSICS;   

DOI  :  10.3390/rs11101171

来源: DOAJ

【 摘 要 】

This study presents a common recalibration method that has been applied to geostationary imagers’ infrared (IR) and water vapour (WV) channel measurements, referred to as the multi-sensor infrared channel calibration (MSICC) method. The method relies on data of the Infrared Atmospheric Sounding Interferometer (IASI), Atmospheric Infrared Sounder (AIRS), and High-Resolution Infrared Radiation Sounder (HIRS/2) on polar orbiting satellites. The geostationary imagers considered here are VISSR/JAMI/IMAGER on JMA’s GMS/MTSAT series and MVIRI/SEVIRI on EUMETSAT’s METEOSAT series. IASI hyperspectral measurements are used to determine spectral band adjustment factors (SBAF) that account for spectral differences between the geostationary and polar orbiting satellite measurements. A new approach to handle the spectral gaps of AIRS measurements using IASI spectra is developed and demonstrated. Our method of recalibration can be directly applied to the lowest level of geostationary measurements available, i.e., digital counts, to obtain recalibrated radiances. These radiances are compared against GSICS-corrected radiances and are validated against SEVIRI radiances, both during overlapping periods. Significant reduction in biases have been observed for both IR and WV channels, 4% and 10%, respectively compared to the operational radiances.

【 授权许可】

Unknown