首页 | 官方网站   微博 | 高级检索  
     

A diagnostic analysis of the weakening of West Pacific subtropical anticyclone during the period of South China Sea summer monsoon onset in 1998
作者姓名:黄辰洁  蓝光东  徐敏贞  陈训来  王安宇  吴池胜
作者单位:Departure of Atmospheric Science;Sun Yat-Sen University;Macau Meteorological and Geophysical Service;Shenzhen Meteorological Bureau;
基金项目:Natural Science Foundation of China (40505015)
摘    要:The onset of South China Sea summer monsoon in 1998 occurred on May 21st. Using the U.S. National Centers for Environmental Prediction reanalysis data, this paper examines the physical process of the weakening of a subtropical anticyclone in West Pacific during the onset period using the Zwack-Okossi vorticity equation. Results show that during the pre-onset period, the positive vorticity advection in front of an upper tropospheric trough was the most dominant physical mechanism for the increase of the cyclonic vorticity on the 850-hPa layer over the South China Sea and its nearby region. The secondary contribution to the increase of the cyclonic vorticity was the warm-air advection. After the onset, the magnitude of the latent-heat warming term rapidly increased and its effect on the increase of the cyclonic vorticity was about the same as the positive-vorticity advection. The adiabatic term and divergence term contributed negatively to the increase of the cyclonic vorticity most of the time. Thus, the positive vorticity advection is the most important physical mechanism for the weakening of the West Pacific subtropical anticyclone over the South China Sea during the onset period.


A diagnostic analysis of the weakening of West Pacific subtropical anticyclone during the period of South China Sea summer monsoon onset in 1998
HUANG Chen-jie,LAN Guang-dong,CHOI Man-cheng,CHEN Xun-lai,WANG An-yu and WU Chi-sheng.A diagnostic analysis of the weakening of West Pacific subtropical anticyclone during the period of South China Sea summer monsoon onset in 1998[J].Journal of Tropical Meteorology,2011,17(2):147-155.
Authors:HUANG Chen-jie  LAN Guang-dong  CHOI Man-cheng  CHEN Xun-lai  WANG An-yu and WU Chi-sheng
Affiliation:1. Departure of Atmospheric Science, Sun Yat-Sen University, Guangzhou 510275 China
2. Macau Meteorological and Geophysical Service, Macau, China
3. Shenzhen Meteorological Bureau, Shenzhen 518040 China
Abstract:The onset of South China Sea summer monsoon in 1998 occurred on May 21st. Using the U.S. National Centers for Environmental Prediction reanalysis data, this paper examines the physical process of the weakening of a subtropical anticyclone in West Pacific during the onset period using the Zwack-Okossi vorticity equation. Results show that during the pre-onset period, the positive vorticity advection in front of an upper tropospheric trough was the most dominant physical mechanism for the increase of the cycl...
Keywords:South China Sea Summer Monsoon  Zwack-Okossi vorticity equation  vorticity advection  West Pacific subtropical anticyclone  
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《热带气象学报(英文版)》浏览原始摘要信息
点击此处可从《热带气象学报(英文版)》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号