文献类型：期刊文献

英文题名：Interannual Variability of the South Equatorial Current in the Southeast Indian Ocean Associated with El Ni?o–Southern Oscillation

作者：Mao, Xingpeng[1]; Zheng, Shaojun[1,2,3]; Feng, Ming[4]; Liang, Peng[1,2,3]; Xie, Lingling[1,2,3]; Yang, Lina[1,2,3]; Yan, Li[1,2,3]

机构：[1] Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Guangdong, Zhanjiang, China; [2] Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea, Deep Sea of Department of Education of Guangdong Province, Guangdong Ocean University, Guangdong, Zhanjiang, China; [3] Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing, China; [4] CSIRO Environment, Indian Ocean Marine Research Centre, Crawley, Australia

年份：2025

卷号：38

期号：2

起止页码：545

外文期刊名：Journal of Climate

收录：EI(收录号：20250817896642)、Scopus(收录号：2-s2.0-85217847650)

语种：英文

外文关键词：Atmospheric pressure - Climatology - Elastic waves - Java programming language - Light transmission - Ocean currents - Sea level - Tropics - Wind

外文摘要：Interannual variability of the South Equatorial Current (SEC) in the southeast Indian Ocean is investigated using Archiving, Validation, and Interpretation of Satellite Oceanographic Data (AVISO) and Global Ocean Reanalysis and Simulations (GLORYS) data from January 1993 to December 2022 and a 1.5-layer reduced-gravity model. Interannual variability of the SEC averaged over the upper 200 m in the southeast Indian Ocean is influenced by El Ni?o–Southern Oscillation (ENSO). The SEC has a significant positive correlation with the Ni?o-3.4 index and lags the Ni?o-3.4 index by 12–15 months, with the SEC weakening significantly during the decaying years of El Ni?o events and vice versa for La Ni?a events. Mechanistic studies suggest that during the developing years of El Ni?o events, the northward sea level anomaly (SLA) pressure gradient between the negative SLA off Sumatra–Java coast and the positive SLA of SEC region (908–1158E, 98–138S) strengthens the SEC under geostrophic equilibrium. During the decaying years of El Ni?o events, the negative SLA in the tropical western Pacific Ocean propagates through the Maritime Continent to the SEC region. The SLA pressure gradient between the Sumatra–Java coast and the SEC region reverses to southward. This induces an eastward geostrophic current anomaly under geostrophic equilibrium, significantly weakening the SEC. The converse holds for La Ni?a events. Local wind in the southeast Indian Ocean has a suppressive effect on the SLA propagated to this area. The results of the 1.5-layer reduced-gravity model verify these phenomena, and the westward-propagating SLA from the Maritime Continent induced by the Pacific wind plays a dominant role in the SLA variation in the SEC region from model experiment. This study can improve the understanding of the effects of ENSO processes on ocean circulation in the southeast Indian Ocean. ó 2024 American Meteorological Society.