ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Data Assimilation Forecast Impact of Beidou Sounding on Typhoon Saola (2309) Forecast in South China Fields Observation Experiment
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Abstract:
Based on the data from the South China outfield experiment in summer 2023, the contribution of assimilating Beidou sounding data from the Guangdong network to forecasting Typhoon Saola (2309) was studied and analyzed using the three-dimensional variational assimilation method of the Weather Research and Forecasting Model (WRF) and its Variational Assimilation System (WRFDA). The application prospects of the fully operationalized new Beidou sounding observation system were also explored. The study found that Beidou sounding has basically the same quality as L-band sounding at the same station, as well as ERA5 reanalysis data and FNL analysis field data, and has high observational value. The effective assimilation of Beidou sounding data has adjusted the temperature, humidity, and wind fields of the background field to varying degrees, significantly improving the analysis field. It also has corresponding improvements in the forecast of the typhoon"s track, intensity, and precipitation, with the track error improving by 11.87% compared to the non-assimilated Beidou sounding.
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