海洋预报2023，Vol.40Issue(6)：78-89,12.DOI:10.11737/j.issn.1003-0239.2023.06.008
南海-西北太平洋季风槽及其与热带气旋的关系:不同再分析资料对比
Monsoon trough of the South China Sea-Western North Pacific and its relation-ship with tropical cyclone activity:a comparison of different reanalysis datasets
摘要
Abstract
Based on the 1981-2020 data of the tropical cyclone best track data of China Meteorological Administration(CMA),CMA atmospheric reanalysis data(CMA-RA),the fifth generation ECMWF atmospheric reanalysis dataset(ERA5)and the first generation NCEP/NCAR atmospheric monthly reanalysis dataset(NCEP-I),the performance and applicability of CMA-RA in describing the South China Sea-Western North Pacific monsoon trough and its relationship with tropical cyclone activity in the South China Sea are analyzed,with respect to the ERA5 and NCEP-I data.The results show that:Different datasets consistently represent the characteristics of obvious low level cyclonic vortex feature in the South China Sea and western Northwest Pacific,and uniform distribution in the eastern Northwest Pacific,CMA-RA and ERA5 have a little difference in describing the low-level vorticity.Different datasets have a high correlation in monsoon trough intensity,the overall intensity pattern is CMA-RA>ERA5>NCEP-I,and the intensity of the South China Sea monsoon trough varies greatly;The depictions of the eastern extension point have a high consistency,where that of CMA-RA is further west than those of ERA5 and NCEP-I;The descriptions of the north-south position have a lower consistency,the difference of CMA-RA and ERA5 is relatively small.All the datasets depict the vertical structure of strong convergence in the middle and lower layers and strong divergence in the upper layers of the monsoon trough region,and the difference between CMA-RA and ERA5 is the smallest,CMA-RA and NCEP-I is the largest in the vertical cross section of vorticity averaged over 105°～160°E.The monsoon trough of CMA-RA is most closely related to tropical cyclone frequency,followed by ERA5,the monsoon trough intensity of ERA5 is most closely related to tropical cyclone activity intensity,and the monsoon trough eastern extension point of ERA5 and CMA-RA have closer relationship with tropical cyclone activity intensity than that of NCEP-I.As a whole,CMA-RA has comparable performance with ERA5 and NCEP-I in characterizing the monsoon trough and its relationship with tropical cyclone activity in the South China Sea,and it's highly consistent with ERA5.关键词
南海-西北太平洋季风槽/再分析资料/CMA-RA/热带气旋活动/对比分析Key words
the South China Sea-Western North Pacific monsoon trough/reanalysis datasets/CMA-RA/tropical cyclone activity/comparative analysis分类
海洋学引用本文复制引用
邢彩盈,吴胜安,朱晶晶,胡德强..南海-西北太平洋季风槽及其与热带气旋的关系:不同再分析资料对比[J].海洋预报,2023,40(6):78-89,12.基金项目
海南省自然科学基金青年基金项目(423QN319) （423QN319）
中国气象局复盘总结专项(FPZJ2023-103) （FPZJ2023-103）
海南省气象局技术提升项目(hnqxSJ202106). （hnqxSJ202106）
