Study on the surface wind asymmetries and its evolution in the offshore tropical cyclones (Grant No. 42075056)

The project titled “Study on the surface wind asymmetries and its evolution in the offshore tropical cyclones” funded by the Natural Science Foundation, was approved in 2021.

The drastic changes of tropical cyclone (TC) surface wind structure are usually difficult to forecast and thus often cause great difficulties in disaster preparedness and evacuation. However, there are few studies on the surface wind structure in the offshore TCs of China, especially the dynamics characteristics during the evolution. Therefore, adjoining with the surface wind data analysis from observational experiments and the dynamic model construction, this project is focused on exploring the asymmetric structure and evolutions of the offshore TCs. The main study research contents are as follows: 1) firstly, study the basic climatic features of the TC surface wind structure, including the combined impact of environmental wind and terrain on the TC wind structure variation; 2) Next, based on the tropical cyclone out-field experiments, the asymmetric structure features will be mainly analyzed; 3) Finally, this project will provide a dynamic-based asymmetric parametric model. These results will provide scientific basis for reconstructing the historical tropical cyclones wind radius and forecasting the asymmetric wind field.

Fig.1 Boxplots depicting interagency differences in the maximum wind speed and CI between pairs of BTDs.