文献类型：期刊文献

英文题名：Seasonal Variability of the Pacific South Equatorial Current during the Argo Era

作者：Yang, Lina[1,2,3];Murtugudde, Raghu[4];Zheng, Shaojun[1,2,3];Liang, Peng[1,2,3];Tan, Wei[5];Wang, Lei[1,2,3];Feng, Baoxin[1,2,3];Zhang, Tianyu[1,2,3]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Peoples R China;[2]Dept Educ Guangdong Prov, Key Lab Climate Resources & Environm Continental S, Zhanjiang, Peoples R China;[3]Minist Nat Resources, Key Lab Space Ocean Remote Sensing & Applicat c, Beijing, Peoples R China;[4]Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD USA;[5]Shandong Univ Sci & Technol, Coll Ocean Sci & Engn, Qingdao, Peoples R China

年份：2022

卷号：52

期号：10

起止页码：2289

外文期刊名：JOURNAL OF PHYSICAL OCEANOGRAPHY

收录：SCI-EXPANDED(收录号：WOS:000872397000001)、、EI(收录号：20223912804835)、Scopus(收录号：2-s2.0-85138690029)、WOS

基金：We acknowledge the International Argo Program, the Global Tropical Moored Buoy Array Program, the AVISO+ and the Copernicus Marine and Environment Monitoring Service, the European Center for Medium-Range Weather Forecasts, the National Centers for Environmental Information, and the National Aeronautics and Space Administration for sharing the data. This study is supported by the National Natural Science Foundation of China (Grants 41706033, 42006023, and 41776031), the National Key Research and Development Program of China (Grant 2018YFC1506903), the program for scientific research start-up funds of Guangdong Ocean University (Grants R20020, R20023, R17051, R18023, R20019), the team project funding of scientific research innovation for universities in Guangdong Province (2019KCXTF021), and Guangdong Postgraduate Education Innovation Project (2022SQXX024). R. Murtugudde gratefully acknowledges the Emeritus position at the University of Maryland, College Park, and the Visiting Faculty position at the Indian Institute of Technology Bombay.

语种：英文

外文关键词：Kelvin waves; Ocean circulation; Ocean dynamics; Rossby waves; Wind stress curl

外文摘要：The tropical Pacific currents from January 2004 to December 2018 are computed based on the gridded Argo temperatures and salinities using the P-vector method on an f plane and the geostrophic approximation on a beta plane. Three branches of the South Equatorial Current (SEC) are identified, i.e., SEC(N) (2 degrees S-5 degrees N), SEC(M) (7 degrees-3 degrees S), and SEC(S) (20 degrees-8 degrees S), with the maximum zonal velocity of -55 cm s(-1) and total volume transport of -49.8 Sv (1 Sv equivalent to 10(6) m(3) s(-1)) occurring in the central-east Pacific. The seasonal variability of each branch shows a distinct and different westward propagation of zonal current anomalies, which are well mirrored by the SLA differences between 2 degrees S and 5 degrees N, between 3 degrees S and 6 degrees S, and between 8 degrees S and 15 degrees S, respectively. Most of the seasonal variations are successfully simulated by a simple analytical Rossby wave model, highlighting the significance of the first-mode baroclinic, linear Rossby waves, particularly those driven by the wind stress curl in the central-east Pacific. However, the linear theory fails to explain the SEC(M) variations in certain months in the central-east Pacific, where the first baroclinic mode contributes only around 50% of the explained variance to the equatorial surface currents. A nonlinear model involving higher baroclinic modes is suggested for a further diagnosis. Considering the crucial role played by the tropical Pacific in the natural climate variability via the El Nino-Southern Ocean dynamics and the ocean response to anthropogenic forcing via the ocean heat uptake in the eastern tropical Pacific, advancing the process understanding of the SEC from observations is critical.