大气科学2018，Vol.42Issue(1)：227-238,12.DOI:10.3878/j.issn.1006-9895.1708.16280
超强台风“天鹅”(2015)路径突变过程机理研究
A Mechanism Study on the Sudden Track Change of Super Typhoon Goni (2015)
摘要
Abstract
Based on the best track data from China Meteorological Agency and 6-h reanalysis data with a resolution of 1° × 1° from National Centers for Environmental Prediction,this study conducts the piecewise potential vorticity inversion to reveal the dynamic mechanism by which the 15th super typhoon Goni in 2015 suddenly changed its track.The results are as follows.(1) From the perspective of synoptic system,Goni was affected by the large-scale background system and the steering flows including the Northwest Pacific subtropical high,the monsoon gyre,the typhoon Atsani and the peripheral anticyclone of Atsani during the whole lifetime of Goni.(2) On the basis of quantitative analysis of the steering flow inverted from potential vorticity perturbation associated with the four components,we find that the steering flow vector of Goni was always affected by the Northwest Pacific subtropical high,while the monsoon gyre and peripheral anticyclone played a secondary role.At the time when Goni turned northward suddenly,the steering flow associated with the peripheral anticyclone acted as a major factor that resulted in the abrupt northward turning.(3) The contribution of the total potential vorticity perturbation to the relevant steering flow at different altitudes is further analyzed quantitatively.Results show that the steering flow vector in the middle troposphere is in good agreement with the movement of Goni,and the southerly flow formed in the low-level system is closely related to Goni's abrupt northward turning and its subsequent enhancement in the upper troposphere after the abrupt turning.关键词
台风/位涡反演/路径突变/引导气流Key words
Typhoon/Potential vorticity inversion/Sudden track change/Steering flow分类
天文与地球科学引用本文复制引用
毕鑫鑫,陈光华,周伟灿..超强台风“天鹅”(2015)路径突变过程机理研究[J].大气科学,2018,42(1):227-238,12.基金项目
国家自然科学基金项目41475074、41275001、41475091,国家重点基础研究发展计划(973计划)项目2014CB953902,气象灾害教育部重点实验室(南京信息工程大学)开放课题KLME1604 National Natural Science Fundation of China (Grants 41475074,41275001,41475091),National Basic Research Program of China (973 Program) (Grant 2014CB953902),Key Laboratory of Meteorological Disaster,Ministry of Education (NUIST) Open Project (Grant KLME1604) （973计划）
