doi:  10.3878/j.issn.1006-9895.1801.17191
印度洋偶极子对中国南海夏季西南季风水汽输送的影响

The Influence Of Indian Ocean Dipole On The South-West Warter Transport In South China SeaZHANG Jianqi1,3 Ye Chengzhi2 Zuo Ruiting1Chen Jingjing2
摘要点击 2348  全文点击 440  投稿时间:2017-07-07  修订日期:2017-09-17
查看HTML全文  查看全文  查看/发表评论  下载PDF阅读器
基金:  国家自然科学基金
中文关键词:  印度洋偶极子 MJO 西太平洋副热带高压  深厚积云对流 Reverse-Hadley环流 PIAP3大气环流模式
英文关键词:  Indian  ocean diploe  MJO Subtropical  high Deep  cumulus convection  Reverse-Hadley  circulation PIAP3
     
作者中文名作者英文名单位
张舰齐National university of defense and technology国防科学技术大学气象海洋学院 湖南长沙
叶成志Changsha湖南省气象台
引用:张舰齐,叶成志.2018.印度洋偶极子对中国南海夏季西南季风水汽输送的影响[J].大气科学
Citation:National university of defense and technology,Changsha.2018.The Influence Of Indian Ocean Dipole On The South-West Warter Transport In South China SeaZHANG Jianqi1,3 Ye Chengzhi2 Zuo Ruiting1Chen Jingjing2[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      利用NCEP/NCAR再分析资料和PIAP3大气环流模式,分析了印度洋偶极子对夏季南海西南季风水汽输送的影响。结果表明,印度洋偶极子正位相期间夏季中国南海西南水汽输送较强,负位相期间则较弱。原因可归结为以下:正位相期间,MJO多活动于热带西印度洋,其向东传播受到阻碍,但经向传播明显,通常可传播至孟加拉湾地区,同时PIAP3显示印度洋季风槽位置偏北,且印尼以西过赤道气流较强,从而使得这一地区气旋性环流得到建立与加强。孟加拉湾地区对应着较强的对流活动以及深厚积云对流加热,从而通过对流加热的二级热力响应使西太平洋副热带高压位置向北推进,进而使得南海地区西南季风水汽输送得到建立与加强。在此期间孟加拉湾、中南半岛至南海地区对流活动较强,而苏门答腊沿岸对流活动受到抑制,由此增强了Reverse-Hadley环流,使低层经向风较强,进而增强了南海西南季风的水汽输送,PIAP3大气环流模式证实了Reverse-Hadley环流的增强。负位相期间,MJO多活动于热带东印度洋,在东传过程中受到Walker环流配置影响,在140oE赤道附近形成东西向非对称积云对流加热热源,其东侧Kelvin波响应加强了东风异常并配合副热带高压南缘东风压制了中国南海的西南季风水汽输送。在此期间,MJO在南海地区的经向传播较强,但经向传播常止步于南海地区15oN附近,虽携带大量水汽,但深厚积云对流强烈地消耗水汽使大气中水汽含量降低,PIAP3大气环流模式证实负位相期间深厚积云对流对水汽消耗加大,从而使得负位相期间南海地区水汽含量与正位相期间大体相近,但由于经向风不足使水汽向北输送较弱。
Abstract:
      Based on the NCEP/NCAR reanalysis and PIAP3,the effection of Indian ocean diploe (IOD) on the south-west monsoon warter transport was analysis. The results show that, in the positive of IOD, the Indian monsoon passing through Indo-china peninsula and entering south china sea will strengthen south-west warter transport in summer, while in the negative of IOD, the result was opposite. During positive of IOD, activities of MJO were much at tropical western Indian ocean, the propagation to east is blocaked, while the meridional propagation to north is significantly. It could usually propagate to the bay of Bengal, which leading to the establishment and strengthened of cyclonic circulation. In the meanwhile, PIAP3 displayed the position of monsoon trough in Indian ocean was much more northward, and cross-equatorial flow in the west of Indonesia was much stronger, which corresponded to active convection and stronger heating of deep cumulus convection, then pushed subtropical high to northward by secondary thermal response of deep cumulus convection, which was favorvable to enforcement of south-west warter transport in south china sea. Mean while, the convective activity in bay of Bengal ,Indo-china peninsula and south china sea was much stronger ,while the convective activity in coastal of Sumatra was inhibited, which strengthened Reverse-Hadley circulation and low level meridional wind, that impeld the enforcement of south-west warter transport in south china sea.During the negative of IOD, activities of MJO were much at tropical eastern Indian ocean, the propagation to east was singnificantly effected by Walker circulation, which leading to unsymmetrical heat source in east west direction about at 140oE, the Kelvin wave response in the east strengthened easterly wind anamoly combining with easterly wind in south of subtropical high ,then it strongly pressed Indian monsoon warter transport passing through Indo-china peninsula and entering south china sea. Althoug the meriditonal porpogation of MJO at souch china sea was much strong ,but was blocked at 15oN at souch china sea.,and large vapor was consumed by deep cumulus convection.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
联系电话: 010-82995051,010-82995052传真:010-82995052 邮编:100029 Email:dqkx@mail.iap.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09060247号