Abstract
AbstractFengyun-3E is the first early-morning-orbit polar-orbiting satellite launched by China, which carries the third generation of Microwave Temperature Sounder (MWTS-3). This instrument has 17 channels and it can provide rich atmospheric temperature observation information at different altitudes. To explore the application value of the MWTS-3 data in assimilation, we selected Typhoon Chanthu in 2021 in this study to evaluate the effect of the MWTS-3 data assimilation on the forecasts of typhoons affecting China. The results show that the simultaneous assimilation of the conventional data and MWTS-3 data can effectively correct the westward error of the typhoon track forecasted by the experiments without assimilation and well predict the track of Typhoon Chanthu along the east coast of China and its stay on the ocean area east of Shanghai. Therefore, the characteristics of the heavy rainfall caused by the typhoon only affecting Shanghai and northeastern Zhejiang are also well reproduced. Compared with the conventional data assimilation, the assimilation of the Fengyun-3E MWTS-3 data provides a more noticeable improvement in the typhoon intensity forecasts, thus allowing better forecasts of the spiral rain belt of the typhoon. The results of the rolling test also proved that MWTS-3 data assimilation has a stable improvement effect on typhoon track forecasts and the forecast skill of precipitation heavier than 5 mm.
Funder
the National Key Research and Development Project
the Fengyun numerical prediction and assimilation applications for ground application systems project
Innovative Research Group Project of the National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Reference51 articles.
1. Auligné T, McNally A, Dee DP (2007) Adaptive bias correction for satellite data in a Numerical Weather Prediction system. Q J R Meteorol Soc 133(624):631
2. Barker D, Huang XY, Liu ZQ et al (2012) The weather research and forecasting model’s community variational/ensemble data assimilation system: WRFDA. Bull Amer Meteor Soc 93(6):831–843
3. Carminati F, Candy B, Bell W, Atkinson N (2018) Assessment and assimilation of FY-3 humidity sounders and imager in the UK Met Office global model. Adv Atmos Sci 35:942–954
4. Chou C, Huang H (2011) The impact of assimilating atmospheric infrared sounder observation on the forecast of typhoon tracks. Adv Meteorol. https://doi.org/10.1155/2011/803593
5. Dee DP (2004) Variational bias correction of radiance data in the ECMWF system. Proceedings ECMWF Workshop on Assimilation of high spectral resolution sounders in NWP. In Proceedings of the ECMWF workshop on assimilation of high spectral resolution sounders in NWP (Vol. 28, pp. 97‐112). Reading, UK. Retrieved from https://www.researchgate.net/profile/D_Dee/publication/284331584_Variational_bias_correction_of_radiance_data_in_the_ECMWF_system/links/573758fe08ae9f741b2ad2fc/Variational‐bias‐correctionof‐radiance‐data‐in‐the‐ECMWF‐system.pdf. Accessed 11 Dec 2020