The positive Indian Ocean Dipole–like response in the tropical Indian Ocean to global warming

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• 作者：Yiyong Luo ; Jian Lu ; Fukai Liu ; Xiuquan Wan
• 关键词：Indian Ocean Dipole ; positive Indian Ocean Dipole–like response ; global warming ; Bjerknes feedback
• 刊名：Advances in Atmospheric Sciences
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：33
• 期：4
• 页码：476-488
• 全文大小：3,554 KB
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• 作者单位：Yiyong Luo (1)
  Jian Lu (2)
  Fukai Liu (1)
  Xiuquan Wan (1)
  
  1. Physical Oceanography Laboratory, Ocean University of China, Qingdao, 266100, China
  2. Atmospheric Sciences & Global Change Division, Pacific Northwest National Laboratory, Washington, WA, 99352, USA
  
• 刊物主题：Atmospheric Sciences; Meteorology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9533

文摘

Climate models project a positive Indian Ocean Dipole (pIOD)–like SST response in the tropical Indian Ocean to global warming. By employing the Community Earth System Model and applying an overriding technique to its ocean component (version 2 of the Parallel Ocean Program), this study investigates the similarities and differences of the formation mechanisms for the changes in the tropical Indian Ocean during the pIOD versus global warming. Results show that their formation processes and related seasonality are quite similar; in particular, wind–thermocline–SST feedback is the leading mechanism in producing the anomalous cooling over the eastern tropics in both cases. Some differences are also found, including the fact that the cooling effect of the vertical advection over the eastern tropical Indian Ocean is dominated by the anomalous vertical velocity during the pIOD but by the anomalous upper-ocean stratification under global warming. These findings are further examined through an analysis of the mixed layer heat budget. Keywords Indian Ocean Dipole positive Indian Ocean Dipole–like response global warming Bjerknes feedback