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DOI | 10.1007/s00382-017-3716-8 |
Equatorial Indian Ocean subsurface current variability in an Ocean General Circulation Model | |
Gnanaseelan, C.1; Deshpande, Aditi1,2 | |
2018-03-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:1705-1717 |
文章类型 | Article |
语种 | 英语 |
国家 | India |
英文摘要 | The variability of subsurface currents in the equatorial Indian Ocean is studied using high resolution Ocean General Circulation Model (OGCM) simulations during 1958-2009. February-March eastward equatorial subsurface current (ESC) shows weak variability whereas strong variability is observed in northern summer and fall ESC. An eastward subsurface current with maximum amplitude in the pycnocline is prominent right from summer to winter during strong Indian Ocean Dipole (IOD) years when air-sea coupling is significant. On the other hand during weak IOD years, both the air-sea coupling and the ESC are weak. This strongly suggests the role of ESC on the strength of IOD. The extension of the ESC to the summer months during the strong IOD years strengthens the oceanic response and supports intensification and maintenance of IODs through modulation of air sea coupling. Although the ESC is triggered by equatorial winds, the coupled air-sea interaction associated with IODs strengthens the ESC to persist for several seasons thereby establishing a positive feedback cycle with the surface. This suggests that the ESC plays a significant role in the coupled processes associated with the evolution and intensification of IOD events by cooling the eastern basin and strengthening thermocline-SST (sea surface temperature) interaction. As the impact of IOD events on Indian summer monsoon is significant only during strong IOD years, understanding and monitoring the evolution of ESC during these years is important for summer monsoon forecasting purposes. There is a westward phase propagation of anomalous subsurface currents which persists for a year during strong IOD years, whereas such persistence or phase propagation is not seen during weak IOD years, supporting the close association between ESC and strength of air sea coupling during strong IOD years. In this study we report the processes which strengthen the IOD events and the air sea coupling associated with IOD. It also unravels the connection between equatorial Indian Ocean circulation and evolution and strengthening of IOD. |
英文关键词 | Equatorial Indian Ocean Equatorial subsurface current IOD El Nino Wyrtki jet |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426707100013 |
WOS关键词 | INTERANNUAL VARIABILITY ; ZONAL CURRENTS ; DIPOLE ; EVENTS ; UNDERCURRENT ; THERMOCLINE ; 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/36091 |
专题 | 气候变化 |
作者单位 | 1.Indian Inst Trop Meteorol, Pune 411008, Maharashtra, India; 2.Savitribai Phule Pune Univ, Pune 411007, Maharashtra, India |
推荐引用方式 GB/T 7714 | Gnanaseelan, C.,Deshpande, Aditi. Equatorial Indian Ocean subsurface current variability in an Ocean General Circulation Model[J]. CLIMATE DYNAMICS,2018,50:1705-1717. |
APA | Gnanaseelan, C.,&Deshpande, Aditi.(2018).Equatorial Indian Ocean subsurface current variability in an Ocean General Circulation Model.CLIMATE DYNAMICS,50,1705-1717. |
MLA | Gnanaseelan, C.,et al."Equatorial Indian Ocean subsurface current variability in an Ocean General Circulation Model".CLIMATE DYNAMICS 50(2018):1705-1717. |
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