文献类型：期刊文献

英文题名：Interannual Variability of the East African Coastal Current Associated with El Ni?o–Southern Oscillation

作者：Zheng, Chenyu[1]; Zheng, Shaojun[1,2,3]; Feng, Ming[4]; Xie, Lingling[1,2,3]; Wang, Lei[1,2,3]; Zhang, Tianyu[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 and Deep Sea, 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, WA, Australia

年份：2024

卷号：37

期号：17

起止页码：4613

外文期刊名：Journal of Climate

收录：EI(收录号：20251918362158)、Scopus(收录号：2-s2.0-105004209631)

语种：英文

外文关键词：Elastic waves - Gravity waves - Ocean currents - Water waves

外文摘要：The East African Coastal Current (EACC) is an important western boundary current of the tropical south Indian Ocean and plays an important role in the ocean circulation and biogeochemical cycles in the Indian Ocean. This study investigates the interannual variability of the EACC and its dynamical mechanisms. The result shows that the EACC has interannual variability associated with El Ni?o–Southern Oscillation (ENSO) during 1993–2017. The EACC shows a significantly positive correlation with the Ni?o-3.4 index with a correlation coefficient of 0.65, lagging the Ni?o-3.4 index by 18 months. During the decaying phases of El Ni?o (La Ni?a) events, the negative (positive) sea level anomaly (SLA) propagates westward as upwelling (downwelling) Rossby waves from the southeast Indian Ocean to the southwest Indian Ocean and then strengthens (weakens) the EACC due to zonal SLA gradient off the East African coast under geostrophic equilibrium. The SLA gradually weakens in the southeast Indian Ocean during its westward propagation but strengthens in the southwest Indian Ocean promoted by local wind stress curl anomaly. This study can improve our understanding of the relationship between the western boundary current of the tropical south Indian Ocean and large-scale ENSO air–sea processes and is important for managing marine fisheries and ecosystems on the East African coast. ? 2024 American Meteorological Society.