热带气象学报2012，Vol.28Issue(4)：451-460,10.DOI:10.3969/j.issn.1004-4965.2012.04.003
南海-西北太平洋地区大气准双周振荡对TC生成的调节作用
THE MODULATION EFFECT OF QUASI-BIWEEKLY OSCILLATION ON TROPICAL CYCLONES OVER SOUTH CHINA SEA-WESTERN NORTH PACIFIC
摘要
Abstract
The modulation effect of tropical storms/typhoons over the South China Sea-western North Pacific (SCS-WNP) by quasi-biweekly oscillation (QBWO) is studied, through the classification of four phases with daily NCEP/NCAR reanalysis data, OLR of daily NOAA data and tropical cyclones (TCs) dataset from CMA-STI best track dataset for tropical cyclones in the western North Pacific. In this article, the TCs are divided into strong tropical storm and the level below (generally called tropical storm, refered to as TS), and typhoon level and the above (generally called typhoon, refered to as TY). The results show that the ratio of the number of TS(TY) generated in the wet phase to that of TS(TY) generated in the dry phase in the SCS area is roughly equal to the ratio in the WNP area. This shows that the modulation of TCs' generation by QBWO is the same both in the SCS and in the WNP. QBWO has an important influence on the frequency of TCs' occurrence and the modulation is obvious during phase C. The number of the TC genesis is more in the wet phase of quasi-biweekly convection but less in the dry phase. The QBWO shows the feature of northwest propagation. The westerly phase of the quasi-biweekly zonal wind is conductive to TC formation. Form phase A to phase C, in the process of moving to the west, the monsoon trough shifts to the north slightly and the average position of TC generation also shifts to the northwest. The majority of TCs occurred on the north side of the monsoon trough. In addition, strong diabatic heating and weak zonal wind vertical shear are conductive to the occurrence of TCs.关键词
准双周振荡(QBWO)/热带气旋/季风槽/位相/生成Key words
quasi-biweekly oscillation(QBWO)/tropical cyclone/monsoon trough/phases/formation分类
天文与地球科学引用本文复制引用
金小霞,何金海,占瑞芬,温敏..南海-西北太平洋地区大气准双周振荡对TC生成的调节作用[J].热带气象学报,2012,28(4):451-460,10.基金项目
国家自然科学基金创新群体项目(40921003) （40921003）
国家自然科学基金项目(40775039)共同资助 （40775039）
