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DOI | 10.1175/JCLI-D-17-0081.1 |
The Influence of Atmospheric Convection on the Interaction between the Indian Ocean and ENSO | |
Wieners, Claudia E.; Dijkstra, Henk A.; de Ruijter, Will P. M. | |
2017-12-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:24 |
文章类型 | Article |
语种 | 英语 |
国家 | Netherlands |
英文摘要 | In recent years it has been proposed that a negative (positive) Indian Ocean dipole (IOD) in boreal autumn favors an El Nino (La Nina) at a lead time of 15 months. Observational analysis suggests that a negative IOD might be accompanied by easterly anomalies over the western Pacific. Such easterlies can enhance the western Pacific warm water volume, thus favoring El Nino development from the following boreal spring onward. However, a Gill-model response to a negative IOD forcing would lead to nearly zero winds over the western Pacific. The authors hypothesize that a negative IOD-or even a cool western Indian Ocean alone-leads to low-level air convergence and hence enhanced convectional heating over the Maritime Continent, which in turn amplifies the wind convergence so as to cause easterly winds over the western Pacific. This hypothesis is tested by coupling an idealized Indian Ocean model and a convective feedback model over the Maritime Continent to the Zebiak-Cane model. It is found that, for a sufficiently strong convection feedback, a negative (positive) IOD indeed forces easterlies (westerlies) over the western Pacific. The contribution from the eastern IOD pole dominates. IOD variability is found to destabilize the El Nino-Southern Oscillation (ENSO) mode, whereas Indian Ocean basinwide warming (IOB) variability dampens ENSO, even in the presence of convection. The influence of the Indian Ocean on the spectral properties of ENSO is dominated by the IOB, while the IOD is a better predictor for individual ENSO events. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423492500021 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; EL-NINO ; EQUATORIAL PACIFIC ; CLIMATE ; DIPOLE ; MODEL ; FEEDBACK ; VARIABILITY ; DYNAMICS ; IMPACT |
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/19631 |
专题 | 气候变化 |
作者单位 | Univ Utrecht, Inst Marine & Atmospher Res Utrecht, Dept Phys & Astron, Utrecht, Netherlands |
推荐引用方式 GB/T 7714 | Wieners, Claudia E.,Dijkstra, Henk A.,de Ruijter, Will P. M.. The Influence of Atmospheric Convection on the Interaction between the Indian Ocean and ENSO[J]. JOURNAL OF CLIMATE,2017,30(24). |
APA | Wieners, Claudia E.,Dijkstra, Henk A.,&de Ruijter, Will P. M..(2017).The Influence of Atmospheric Convection on the Interaction between the Indian Ocean and ENSO.JOURNAL OF CLIMATE,30(24). |
MLA | Wieners, Claudia E.,et al."The Influence of Atmospheric Convection on the Interaction between the Indian Ocean and ENSO".JOURNAL OF CLIMATE 30.24(2017). |
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