Improved assimilation of data from China's FY-3A Microwave Temperature Sounder (MWTS)

TitleImproved assimilation of data from China's FY-3A Microwave Temperature Sounder (MWTS)
Publication TypeTechnical memorandum
Date Published02/2011
Secondary TitleECMWF Technical Memoranda
Number642
AuthorsLu, Q, Bell, W, Bauer, P, Bormann, N, Peubey, C, Geer, AJ
PublisherECMWF
Abstract

The FY-3A MWTS suffers from radiometer non-linearities and uncertainties in passband centre frequencies. Corrections have been developed, and are assessed here by comparing re-calibrated MWTS data with equivalent AMSU-A observations. The corrections are effective in improving the first guess departure statistics for MWTS, relative to the original un-corrected data, to values close to those for AMSU-A equivalent channels. In observing system experiments MWTS observations improve the first guess fits for AMSU-A observations. Forecast verification shows a systematic improvement by using the re-calibrated data, for example forecasts of 200 hPa geopotential are improved to Day 4 in the SH by approximately 1%.

URLhttps://www.ecmwf.int/node/10850
DOI10.21957/4grqj1vwq
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