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DOI | 10.1175/JCLI-D-17-0832.1 |
The Influence of the Lower Stratosphere on Ridging Atlantic Ocean Anticyclones over South Africa | |
Ndarana, Thando1; Bopape, Mary-Jane2; Waugh, Darryn3; Dyson, Liesl1 | |
2018-08-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:15页码:6175-6187 |
文章类型 | Article |
语种 | 英语 |
国家 | South Africa; USA |
英文摘要 | The link between Rossby wave breaking and ridging Atlantic Ocean anticyclones in the South African domain is examined using NCEP-DOE AMIP-II reanalysis data. A simple composite analysis, which used the duration of ridging events as a basis of averaging, reveals that ridging anticyclones are coupled with Rossby wave breaking at levels higher than the dynamical tropopause. Lower-stratospheric PV anomalies extend to the surface, thus coupling the ridging highs with the lower stratosphere. The anomaly extending from the 70-hPa level to the surface contributes to a southward extension of the surface negative anomaly over the Namibian coast, which induces a cyclonic flow, causing the ridging anticyclone to take a bean-like shape. The surface positive anomaly induces the internal anticyclonic flow within the large-scale pressure system, causing the ridging end to break off and amalgamate with the Indian Ocean high pressure system. Lower-stratospheric Rossby wave breaking lasts for as long as the ridging process, suggesting that the former is critical to the longevity of the latter by maintaining and keeping the vertical coupling intact. |
英文关键词 | Anticyclones Stratospheric circulation Wave breaking |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000437828900002 |
WOS关键词 | POTENTIAL VORTICITY INVERSION ; ROSSBY-WAVE BREAKING ; CYCLOGENESIS ; HEMISPHERE ; CLIMATOLOGY ; CIRCULATION ; TROPOSPHERE ; TROPOPAUSE ; ANOMALIES ; PRESSURE |
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/19871 |
专题 | 气候变化 |
作者单位 | 1.Univ Pretoria, Dept Geog Geoinformat & Meteorol, Hatfield, South Africa; 2.South African Weather Serv, Pretoria, South Africa; 3.Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA |
推荐引用方式 GB/T 7714 | Ndarana, Thando,Bopape, Mary-Jane,Waugh, Darryn,et al. The Influence of the Lower Stratosphere on Ridging Atlantic Ocean Anticyclones over South Africa[J]. JOURNAL OF CLIMATE,2018,31(15):6175-6187. |
APA | Ndarana, Thando,Bopape, Mary-Jane,Waugh, Darryn,&Dyson, Liesl.(2018).The Influence of the Lower Stratosphere on Ridging Atlantic Ocean Anticyclones over South Africa.JOURNAL OF CLIMATE,31(15),6175-6187. |
MLA | Ndarana, Thando,et al."The Influence of the Lower Stratosphere on Ridging Atlantic Ocean Anticyclones over South Africa".JOURNAL OF CLIMATE 31.15(2018):6175-6187. |
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