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DOI | 10.1002/2016JD025373 |
Teleconnection between the South Atlantic convergence zone and the southern Indian Ocean: Implications for tropical cyclone activity | |
DeBlander, Evan; Shaman, Jeffrey | |
2017-01-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A link between anomalous austral summer convection over the South Atlantic convergence zone (SACZ) and atmospheric conditions over the South Indian Ocean is investigated. Interannual north-south shifts in the SACZ produce a dipole of anomalous convection and precipitation over South America. The South Atlantic convergence zone index (SACZI) capturing this variability is presented and associated with a midlatitude Rossby wave train that propagates from South America eastward and south of Africa before curving north into the tropical Indian Ocean. This wave train is reproduced using Rossby wave ray tracing and simulations with a linearized barotropic vorticity equation model forced with divergence and convergence consistent with the observed dipole of anomalous convection. The wave train acts to excite anomalies in wind shear and relative humidity over the tropical south Indian Ocean, which in turn impact tropical cyclone (TC) genesis and distribution over this region. We find that changes in the wind shear and relative humidity associated with the SACZI effect changes in TC genesis, which result in a change in observed TC days over portions of the South Indian Ocean. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396116900010 |
WOS关键词 | SUMMER MONSOON RAINFALL ; ROSSBY-WAVE PROPAGATION ; INTERANNUAL VARIABILITY ; BAROTROPIC ATMOSPHERE ; CLIMATE VARIABILITY ; GAUGE OBSERVATIONS ; AMERICA ; PRECIPITATION ; REMOTE ; AFRICAN |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32198 |
专题 | 气候变化 |
作者单位 | Columbia Univ, Dept Environm Hlth Sci, New York, NY USA |
推荐引用方式 GB/T 7714 | DeBlander, Evan,Shaman, Jeffrey. Teleconnection between the South Atlantic convergence zone and the southern Indian Ocean: Implications for tropical cyclone activity[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(2). |
APA | DeBlander, Evan,&Shaman, Jeffrey.(2017).Teleconnection between the South Atlantic convergence zone and the southern Indian Ocean: Implications for tropical cyclone activity.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(2). |
MLA | DeBlander, Evan,et al."Teleconnection between the South Atlantic convergence zone and the southern Indian Ocean: Implications for tropical cyclone activity".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.2(2017). |
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