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Title: The positive Indian Ocean Dipole-like response in the tropical Indian Ocean to global warming

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 (CESM) and applying an overriding technique to its ocean component Parallel Ocean Program version 2 (POP2), this study investigates the similarity and difference 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, the Bjerknes feedback is the leading mechanism in producing the anomalous cooling over the eastern tropics in both cases. Some differences are also found, including that the cooling effect of the vertical advection over the eastern tropical Indian Ocean is dominated by the anomalous vertical velocity during the pIOD while it is dominated by the anomalous upper-ocean stratification under global warming. Lastly, these findings above are further examined with an analysis of the mixed layer heat budget.
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Ocean Univ. of China, Qingdao (China)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
OSTI Identifier:
1255384
Report Number(s):
PNNL-SA--108666
Journal ID: ISSN 0256-1530; KP1703010
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Advances in Atmospheric Sciences
Additional Journal Information:
Journal Volume: 33; Journal Issue: 4; Journal ID: ISSN 0256-1530
Publisher:
Springer
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES Indian Ocean dipole; positive Indian Ocean dipole-like response; global warming; Bjerknes feedback