Impact of ERS-2 Scatterometer wind data on Global Analysis-Forecast system
Keywords:European remote sensing satellite, ERS, Scatterometer wind, Global data assimilation, Quality control, Data impact, Numerical weather prediction, Medium range weather forecast, Tropical cyclone, Anomaly correlation
The near surface scatterometer wind data from the European remote sensing satellite ERS-2 of European space agency(ESA) became available at NCMRWF on real time basis since February 1997. An attempt has been made to assimilate this data in the global data assimilation system(GDAS) operational at NCMRWF after proper quality control to study its impact on the analysis as well as on medium range weather forecast over the tropics. For this purpose the GDAS was run for 15 days (27 May to 10 June 1998). The impact has been examined through circulation characteristics and various objective scores. The study revealed that with proper quality control the scatterometer wind data can be assimilated in real time basis, resulting in an overall improvement in performance of the analysis-forecast system.
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