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- Title
The Southwest Indian Ocean thermocline dome in CMIP5 models: Historical simulation and future projection.
- Authors
Zheng, Xiao-Tong; Gao, Lihui; Li, Gen; Du, Yan
- Abstract
Using 20 models of the Coupled Model Intercomparison Project Phase 5 (CMIP5), the simulation of the Southwest Indian Ocean (SWIO) thermocline dome is evaluated and its role in shaping the Indian Ocean Basin (IOB) mode following El Ni˜no investigated. In most of the CMIP5 models, due to an easterly wind bias along the equator, the simulated SWIO thermocline is too deep, which could further influence the amplitude of the interannual IOB mode. A model with a shallow (deep) thermocline dome tends to simulate a strong (weak) IOB mode, including key attributes such as the SWIO SST warming, antisymmetric pattern during boreal spring, and second North Indian Ocean warming during boreal summer. Under global warming, the thermocline dome deepens with the easterly wind trend along the equator in most of the models. However, the IOB amplitude does not follow such a change of the SWIO thermocline among the models; rather, it follows future changes in both ENSO forcing and local convection feedback, suggesting a decreasing effect of the deepening SWIO thermocline dome on the change in the IOB mode in the future.
- Subjects
INDIAN Ocean Region; INDIAN Ocean; THERMOCLINES (Oceanography); EL Nino; GLOBAL warming &; the environment; OCEAN currents
- Publication
Advances in Atmospheric Sciences, 2016, Vol 33, Issue 4, p489
- ISSN
0256-1530
- Publication type
Article
- DOI
10.1007/s00376-015-5076-9