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decadal Indian Ocean Dipolar variability and Its Relationship with the tropical pacific

Advances in Atmospheric Sciences 2017年第11期34卷 1282-1289页

作者： Yun YANG Jianping LI Lixin WU Yu KOSAKA Yan DU Cheng SUN Fei XIE Juan FENG State Key Laboratory of Earth Surface Processes and Resource Ecology and College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technologyqingdao 266237China Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology Ocean University of Chinaqingdao 266003China Research Center for Advanced Science and Technology University of TokyoTokyo153-8904Japan State Key Laboratory of tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciencesguangzhou 510301China

A robust decadal Indian Ocean dipolar variability （DIOD） is identified in observations and found to be related to tropical pacific decadal variability （TPDV）. A pacific Ocean-global atmosphere （POGA） experiment, with fixed radiative forcing, is conducted to evaluate the DIOD variability and its relationship with the TPDV. In this experiment, the sea surface temperature anomalies are restored to observations over the tropical pacific, but left as interactive with the atmosphere elsewhere. The TPDV-forced DIOD, represented as the ensemble mean of 10 simulations in POGA, accounts for one third of the total variance. The forced DIOD is triggered by anomalous Walker circulation in response to the TPDV and develops following Bjerknes feedback. Thermocline anomalies do not exhibit a propagating signal, indicating an absence of oceanic planetary wave adjustment in the subtropical Indian Ocean. The DIOD-TPDV correlation differs among the 10 simulations, with a low correlation corresponding to a strong internal DIOD independent of the TPDV. The variance of this internal DIOD depends on the background state in the Indian Ocean, modulated by the thermocline depth off Sumatra/Java.

关键词： Indian Ocean dipole decadal variability tropical pacific decadal variability

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