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589 / 2024-09-18 15:18:31
Strengthened Relationship Between Tropical Indian Ocean Dipole and Subtropical Indian Ocean Dipole After the Late 2000s
tropical and subtropical interaction
Session 60 - Indian Ocean Dynamics, Air-sea Interaction and Biogeochemical Cycles
摘要录用
Bicheng Huang / China；College of Physical Science and Technology； Yangzhou University； Yangzhou
Guolin Feng / College of Physical Science and Technology, Yangzhou University, Yangzhou, China
This study identifies a strengthened relationship between the subtropical Indian Ocean dipole (SIOD) during January–February–March (JFM) and the following autumn Indian Ocean dipole (IOD) after the late 2000s. Following the positive SIOD, the northwesterly wind anomalies help to maintain positive sea surface temperature (SST) anomalies in the southwestern tropical Indian Ocean by wind-evaporation-SST (WES) feedback during June–July–August (JJA). The anomalous northwesterly winds and the sustained positive SST anomalies promote the development of the zonal wavenumber-3 pattern (ZW3P) and induce low-level convergence in the mid-latitude central southern Indian Ocean, leading to the anticyclone circulation over the northern Indian Ocean by the local Hadley circulation during JJA. The accompanying central equatorial easterly wind anomalies appear in JJA, which is the key to trigger a positive IOD event through Bjerknes feedback. This mechanism for the enhanced SIOD-IOD relationship is independent from the El Niño-Southern Oscillation (ENSO).
重要日期

  • 会议日期

    01月13日

    2025

    至

    01月17日

    2025

  • 09月27日 2024

    初稿截稿日期

  • 01月17日 2025

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
承办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
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