环境因子对西北太平洋热带气旋气候特征的影响*

南京大学学报(自然科学版) ›› 2010, Vol. 46 ›› Issue (3): 254–260.

环境因子对西北太平洋热带气旋气候特征的影响*

杜予罡, 储惠芸**

出版日期:2015-03-30 发布日期:2015-03-30
作者简介: (南京大学大气科学学院中尺度灾害性天气教育部重点实验室, 南京, 210093)
基金资助:
国家自然科学基金( 40830958、 40730948、 90715031) , 国家重点基础研究发展规划项目( 2009CB421502、
2004CB418301) , 2005 年博士点专项科研基金( 20050284035) , 江苏省自然科学基金( BK2005081) , 上海台风研
究所开放课题( 2008ST08)

The relationship between environmental factors and tropical cyclone activity in the western North Pacific

Du Yu Gang, Chu Hui Yun

Online:2015-03-30 Published:2015-03-30
About author: (Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 T he National Key Laboratory of Meso scale Severe Weather, Ministry of Education. China)

摘要/Abstract

摘要： 为研究环境因子对西北太平洋热带气旋气候特征的影响, 选取影响热带气旋( TC) 活动的 4 个单向环境因子: 海表温度、 850 hPa 气温、对流层中低层比湿( 925~ 500 hPa) 和风速垂直切变( 200~
850 hPa), 海表温度只表征了海洋的加热状态, 而后 3个因子则只反映了大气的状态. 通过分析这 4 个环境因子与西北太平洋 T C 活动的相关关系, 进而定义两个指数: 考虑海气耦合作用的指数 -T (-T =SST - T a ,
其中 SST、 T a 分别为海表温度和 850 hPa 气温) 以及反映海洋上空湿空气稳定度的指数 - se ( se = se850 - se1 000 , 其中 se850 、 se1 000 分别表示 850hPa、 1000hPa 的假相当位温). 结果表明, 指数 -T 以
及 - se 与西北太平洋 TC 活动的相关性均比较显著, 其中考虑了海气耦合作用的指数 -T 能更好地表征TC 活动的气候变化.

Abstract: In order to better understand the relationship between environmental factors and tropical cyclone ( TC) activity in the western North Pacific( WNP) . The sea surface temperature( SST) , 850 hPa temperature, specific
humidity index (between 925~ 500 hPa) and vertical wind shear ( between 200~ 850 hPa) are chosen over the WNPduring a 32yr period from 1970- 2001. All the indices either represent oceanic warming ( such as SST ), or only
reflect atmospheric conditions. The results show that 850 hPa temperature and specific humidity index both positively contribute to the development of T C activity. Particularly, the SST and vertical wind shear inhibit TC
activity. According to the results, two indices are defined. One is the temperature difference between 850 hPatemperature and SST which represents atmosphere ocean coupling influence. The other reflects static stability
between 850 hPa and 1 000 hPa of atmosphere. After analyzing the indices, it is found that, the temperature difference considering the coupling degree of air sea is of significant impact on TC activity.

杜予罡, 储惠芸** . 环境因子对西北太平洋热带气旋气候特征的影响*

[J]. 南京大学学报(自然科学版), 2010, 46(3): 254–260.

Du Yu Gang, Chu Hui Yun . The relationship between environmental factors and tropical cyclone activity in the western North Pacific

[J]. Journal of Nanjing University(Natural Sciences), 2010, 46(3): 254–260.

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