南海盐致环流对台风降水的响应特征分析

doi:10.11978/2018107

热带海洋学报 ›› 2019, Vol. 38 ›› Issue (3): 13-21.doi: 10.11978/2018107CSTR: 32234.14.2018107

所属专题：南海专题

南海盐致环流对台风降水的响应特征分析

刘娜^1,²,王桂华²(),巩远发¹,刘磊²

^1. 成都信息工程大学大气科学学院, 四川成都 610225
^2. 复旦大学大气与海洋科学系, 上海 200082

收稿日期:2018-10-16 修回日期:2018-11-27 出版日期:2019-05-20 发布日期:2019-06-17
通讯作者: 王桂华
作者简介:刘娜(1994—), 女, 甘肃省武威市人, 硕士研究生, 主要从事卫星遥感与海气相互作用的研究。E-mail: liunavip666@163.com
基金资助:
国家自然科学基金(91428206);国家自然科学基金(41576022);国家自然科学基金(41811530301);国家自然科学基金(91528304);国家自然科学基金(41621064);国家重点研发计划重点专项课题(2017YFC1404103);"全球变化与海气相互作用"专项(GASI-IPOVAI-04);上海市优秀学术/技术带头人计划(17XD1400600)

An analysis of response characteristics of saline circulation to typhoon precipitation in South China Sea

Na LIU^1,²,Guihua WANG²(),Yuanfa GONG¹,Lei LIU²

^1. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China
^2. Department of Atmospheric and Oceanic Sciences, Fudan University, Shanghai 200082, China

Received:2018-10-16 Revised:2018-11-27 Online:2019-05-20 Published:2019-06-17
Contact: Guihua WANG
Supported by:
The National Natural Science Foundation of China(91428206);The National Natural Science Foundation of China(41576022);The National Natural Science Foundation of China(41811530301);The National Natural Science Foundation of China(91528304);The National Natural Science Foundation of China(41621064);The National Key Research and Development Program of China(2017YFC1404103);The National Programme on Global Change and Air-Sea Interaction(GASI-IPOVAI-04);Program of Shanghai Academic/Technology Research Leader(17XD1400600)

摘要/Abstract

摘要：

本文采用多源卫星遥感数据通过统计分析的方法研究了17年间(2000—2016年)南海夏季(6—9月)台风对该海域降水、淡水通量的贡献及其可能导致的环流异常。主要结论如下: 1) 台风是南海中北部降水的重要影响因子, 可导致日平均降水量增加12mm, 约占南海夏季日平均降水(25mm·d ^-1)的一半, 且西北太平洋台风和南海“土台风”产生的降水分布存在显著的区域和强度差异; 2) 夏季, 南海由淡水通量引起的盐致环流表现为以海南岛东南部海域为中心的弱气旋式, 其流量量级约为-0.15Sv, 约占同期风生环流流量(约为-1.5Sv)的10%; 3) 夏季, 台风带来的降水使得南海中北部的气旋式盐致环流增强, 且西北太平洋台风降水导致的淡水通量变化引起的盐致环流强度要强于南海“土台风”。

关键词: 台风, 淡水通量, 盐致环流, 南海

Abstract:

By using various satellite remote sensing data and statistical analysis method, the contribution of typhoons in summer (from June to September) to the precipitation and freshwater flux in the South China Sea (SCS) and their possible influences on circulation anomalies in the SCS in the past 17 years (2000-2016) were studied. The main conclusions are as follows. Typhoon is one of the crucial factors that impact the precipitation in both northern and middle SCS, and the daily mean precipitation can be increased by 12 mm, which accounts for half of the daily mean rainfall in the SCS during summer. Besides, there are significant differences in the location and intensity of the rainfall distributions between the Northwest Pacific Ocean typhoons (NWP TYs) and SCS typhoons(SCS TYs). In summer, the saline circulation in the SCS induced by freshwater flux shows a weak cyclone that centers in the southwestern part of Hainan island with its magnitude of about -0.15 Sv, which is approximately 10% of wind-induced circulation (about -1.5 Sv) during the corresponding period. Precipitation induced by typhoons can intensify cyclonic saline circulation in the northern-central part of the SCS in summer. And the intensity of the saline circulation caused by NWP typhoons is stronger compared to that by SCS typhoons.

Key words: typhoon, freshwater flux, saline circulation, South China Sea

中图分类号:

P731.21

刘娜,王桂华,巩远发,刘磊. 南海盐致环流对台风降水的响应特征分析[J]. 热带海洋学报, 2019, 38(3): 13-21.

Na LIU,Guihua WANG,Yuanfa GONG,Lei LIU. An analysis of response characteristics of saline circulation to typhoon precipitation in South China Sea[J]. Journal of Tropical Oceanography, 2019, 38(3): 13-21.

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