Tropical oceanic intraseasonal variabilities associated with central Indian Ocean mode

被引:0
|
作者
Ze Meng
Lei Zhou
Raghu Murtugudde
Qingxuan Yang
Kandaga Pujiana
Jingyuan Xi
机构
[1] Shanghai Jiao Tong University,School of Oceanography
[2] Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Physical Oceanography Laboratory/Institute for Advanced Ocean Study/Sanya Oceanographic Institution
[3] University of Maryland,State Key Laboratory of Satellite Ocean Environment Dynamics
[4] Ocean University of China,undefined
[5] Pilot National Laboratory for Marine Science and Technology (Qingdao),undefined
[6] Cooperative Institute for Marine and Atmospheric Studies and NOAA Atlantic Oceanographic and Meteorological Laboratory,undefined
[7] Second Institute of Oceanography,undefined
[8] Ministry of Natural Resources,undefined
来源
Climate Dynamics | 2022年 / 58卷
关键词
Oceanic intraseasonal variability; Tropical Indian Ocean; Mixed layer heat budget; Ocean circulation;
D O I
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中图分类号
学科分类号
摘要
The oceanic intraseasonal variabilities (ISVs) are pronounced over the tropical Indian Ocean. Recently, a Central Indian Ocean (CIO) mode was proposed as an ocean–atmosphere coupled mode at intraseasonal timescales. It has a close relation with northward-propagating ISVs and intraseasonal precipitation during the Indian summer monsoon. In this study, the dynamics of tropical oceanic ISVs associated with the CIO mode are analyzed using reanalysis products and observations. A complete heat budget analysis shows that intraseasonal SST anomalies which propagate westward from the eastern to the central tropical Indian Ocean during the CIO mode are mainly attributable to zonal thermal advection. Surface heat flux is the second largest contributor. This is distinct from the traditional tropical oceanic ISVs as a response to the Madden–Julian Oscillation (MJO) in the atmosphere, in which surface heat flux is usually the dominant component. Current results along with the previously reported atmosphere dynamics during the CIO mode depict a framework for the ocean–atmosphere coupled mode over the tropical Indian Ocean. This represents a more comprehensive understanding of tropical ISVs and will ultimately contribute to the improvement in process understanding, simulations, and forecasts of the Indian summer monsoon.
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页码:1107 / 1126
页数:19
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