Interannual variability of meridional heat transport and its mechanism in the Indian Ocean during monsoon transitions

Xing Huibin; Chen Sheng; Xu Kang; Wang Weiqiang

doi:10.12284/hyxb2021105

Volume 43 Issue 12

Dec. 2021

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Xing Huibin，Chen Sheng，Xu Kang, et al. Interannual variability of meridional heat transport and its mechanism in the Indian Ocean during monsoon transitions[J]. Haiyang Xuebao，2021, 43(12)：26–37 doi: 10.12284/hyxb2021105

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Interannual variability of meridional heat transport and its mechanism in the Indian Ocean during monsoon transitions

doi: 10.12284/hyxb2021105

Xing Huibin^{1, 2
,},
Chen Sheng^{1, 3, 4},
Xu Kang^{1, 3, 4},
Wang Weiqiang^{1, 3, 4
,
,}

1.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
4.
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 511458, China

Received Date: 2021-03-19
Rev Recd Date: 2021-04-30

Available Online: 2021-06-16

Publish Date: 2021-12-30

Abstract

Abstract

Interannual variability of meridional heat transport anomaly (MHTA) in the tropical Indian Ocean (IO) during monsoon transitions (boreal spring and autumn) is investigated based on SODA3.4.2 and POP2 results. There exist two leading interannual modes in spring, namely the consistent mode and the divergence and convergence (div/conv) mode. The consistent mode characterized by the northward MHTA in the upper IO, is controlled by the antisymmetric wind structures with northeasterlies anomalous northeasterlies (northwesterlies) to north (south) of the equator. However, the spring div/conv mode is featured by the meridional divergence in the surface layer and convergence in the subsurface layer on both side of the equator. Such a mode is modulated by the sea surface temperature anomaly (SSTA) dipole in the tropical southwestern IO and subtropical southeastern IO south of the equator. In autumn, the div/conv mode is dominated by the IOD-induced equatorial easterlies and associated anticyclonic wind stress anomalies in the off-equatorial regions. The POP2 model sensitivity experiments confirm the roles of anomalous winds induced by the Indian Ocean SSTA modes in modulating the MHTA, that is, the antisymmetric winds induce northward MHTA, while the anomalous easterly winds lead to the div/conv pattern. Therefore, the interannual variability of air-sea coupled modes in the IO plays a vital role in the basin-scale and hemispheric-scale heat exchanges.
- monsoon transitions,
- meridional heat transport,
- consistent mode,
- divergence and convergence mode,
- interannual variability,
- Indian Ocean dipole

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References(66)

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