Presentation Details
Strengthened Relationship Between Tropical Indian Ocean Dipole and Subtropical Indian Ocean Dipole After the Late 2000s
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Updated Time：2024-10-11 17:43:13 Hits：848
Poster Presentation
Start Time：2025-01-15 18:35（Asia/Shanghai）
Duration：15min
Session：S60 Session 60-Indian Ocean Dynamics, Air-sea Interaction and Biogeochemical Cycles »
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Abstract
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).
Keywords
tropical and subtropical interaction
Speaker
Bicheng Huang
Other China；College of Physical Science and Technology； Yangzhou University； YangzhouSubmission Author
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Important Date
-
Conference Date
Jan 13
2025
toJan 17
2025
-
Sep 27 2024
Draft paper submission deadline
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Feb 17 2025
Registration deadline
Sponsored By
State Key Laboratory of Marine Environmental Science, Xiamen University
Organized By
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
Department of Earth Sciences, National Natural Science Foundation of China
Contact Information
- Kejing GU
- xm******@xmu.edu.cn
- +86*********
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