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Observational force analysis and anisotropic characteristics of tropical cyclone sea surface wind fields over Chinese offshore areas  ( SCI-EXPANDED收录 EI收录)  

文献类型:期刊文献

英文题名:Observational force analysis and anisotropic characteristics of tropical cyclone sea surface wind fields over Chinese offshore areas

作者:Yan, Danchen[1];Zhang, Tianyu[2,3,4];Chen, Lengjian[2,3];Chi, Cheng[2,3];JianYang, Jian;Ou, Zijing[2,3]

机构:[1]Minist Nat Resources, Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China;[2]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Resources & Environm Continental Shelf Sea & Deep, Key Lab Climate, Zhanjiang 524088, Peoples R China;[4]Minist Nat Resources, Key Lab Space Ocean Remote Sensing & Applicat, Beijing 100081, Peoples R China

年份:2025

卷号:318

外文期刊名:ATMOSPHERIC RESEARCH

收录:SCI-EXPANDED(收录号:WOS:001436671200001)、、EI(收录号:20250917949247)、Scopus(收录号:2-s2.0-85218467564)、WOS

基金:National Natural Science Foundation of China grant 42476219; National Natural Science Foundation of China grant 41976200; National Key Research and Development Program of China grant 2021YFC3101801; National Foreign Experts Program grant S20240134; Innovative Team Plan of the Department of Education of Guangdong Province grant 2023KCXTD015; Tropical Ocean Environment in Western Coastal Waters Observation and Research Station of Guangdong Province grant 2024B1212040008; Research Project of the Southern Ocean Laboratory grant SML2022SP301; Guangdong Ocean University Scientific Research Program grant 060302032106.

语种:英文

外文关键词:Tropical cyclones; Parametric wind model; Sea surface; Force analysis; Anisotropy; Storm surges

外文摘要:In this paper, based on the observation data of sea surface buoys, 17 tropical cyclones (TCs) occurring in the East China Sea and South China Sea from 2017 to 2021 are synthesized to conduct a force analysis in a twodimensional radial momentum equation. The analysis evaluates the magnitude, equilibrium, proportional relationships, and spatial distribution features of each force, leading to clarified universal laws. The findings reveal a pronounced radial variability feature in the mean TC sea surface structure. Notably, the regions where the changes are most dramatic are located approximately 80 km from the mean TC center and particularly at 20-40 km. Within an overall range of 0-400 km, the cumulative contributions of each force from high to low are the pressure gradient force, friction term, centrifugal force, Coriolis force and acceleration force. In addition, obvious anisotropic features are also observed. The four orientations can be arranged according to force strength as the right region (240-300 degrees), left region (60-120 degrees), rear region (150-210 degrees) and front region (0-30 degrees and 330-360 degrees). The pronounced pressure gradient force is extremely unstable within the 250 km range of the right (240-300 degrees) and 200 km range of the left (60-120 degrees) regions of the mean TC. The sensitivity of the centrifugal force to radial changes surpasses that of azimuthal changes, and significant variations are concentrated within a radial distance of 50 km. For the Coriolis force, noticeable anisotropic features are evident within the 150 km radius of the 210-330 degrees sector. Additionally, a comparison of the observed radial pressure profile with empirical pressure models was conducted. We found that B parameter values between 0.7 and 1.0 are optimal for our observational cases. Selecting an appropriate environmental pressure can bring the empirical model closer to the observed data. This study establishes a realistic foundation for enhancing existing sea surface parametric wind models of TCs and developing novel approaches, thereby ultimately improving the numerical calculation accuracy for storm surges and other air-sea interactions.

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