文献类型：期刊文献

英文题名：Interannual Variability of the East African Coastal Current Associated with El Nino-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]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Guangdong, Peoples R China;[2]Guangdong Ocean Univ, Dept Educ Guangdong Prov, Key Lab Climate Resources & Environm Continental S, Zhanjiang, Guangdong, Peoples R China;[3]Minist Nat Resources, Key Lab Space Ocean Remote Sensing & Applicat, Beijing, Peoples R China;[4]Indian Ocean Marine Res Ctr, CSIRO Environm, 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：SCI-EXPANDED(收录号：WOS:001343032400001)、、WOS

基金：. This study was supported by the National Key Research and Development Program of China (2021YFC3101801 and 2022YFC3103104) , the Innovative Team Plan for Department of Education of Guangdong Province (2023KCXTD015) , the National Natural Science Foundation of China (41976200) , the First-Class Discipline Plan of Guangdong Province (231420003) , the Program for Scientific Research Start-Up Funds of Guangdong Ocean University (R18023, R19061, and 060302032106) , the Guangdong Postgraduate Education Innovation Project (2022SFKC_057) , and the Guangdong Provincial Observation and Research Station for Tropical Ocean Environment in Western Coastal Waters.

语种：英文

外文关键词：Indian Ocean; ENSO; Ocean circulation; Rossby waves; Wind stress curl; Interannual variability

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 & ntilde;o-Southern Oscillation (ENSO) during 1993-2017. The EACC shows a significantly positive correlation with the Ni & ntilde;o-3.4 index with a correlation coefficient of 0.65, lagging the Ni & ntilde;o-3.4 index by 18 months. During the decaying phases of El Ni & ntilde;o (La Ni & ntilde;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.