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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. These findings above are further examined with an analysis of the mixed layer heat budget.
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Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0256-1530; KP1703010
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Advances in Atmospheric Sciences; Journal Volume: 33; Journal Issue: 4
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
Country of Publication:
United States