文献类型：期刊文献

英文题名：Wind and Heat Forcings of the Seasonal and Interannual Sea Level Variabilities in the Southwest Pacific

作者：Yang, Lina[1,2,3];Zhao, Xinyang[1];Liang, Peng[1,2,3];Zhang, Tianyu[1,2,3];Xie, Lingling[1,2,3];Murtugudde, Raghu[4,5]

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

年份：2023

卷号：53

期号：9

起止页码：2171

外文期刊名：JOURNAL OF PHYSICAL OCEANOGRAPHY

收录：SCI-EXPANDED(收录号：WOS:001106777300003)、、EI(收录号：20233914793061)、Scopus(收录号：2-s2.0-85171981801)、WOS

基金：The authors thank the two anonymous reviewers for their constructive comments. We would like to acknowledge the Data Unification and Altimeter Combination System, the Copernicus Marine Environment and Monitoring Service, the National Oceanic and Atmospheric Administration/Earth System Research Laboratories, the Hadley Centre Sea Ice and Sea Surface Temperature, the European Centre for Medium-Range Weather Forecasts, National Centers for Environmental Prediction, and Asia-Pacific Data-Research Center for sharing the data online. This research is funded by the National Key Research and Development Program of China (2021YFC3101801) , the National Natural Science Foundation of China (42006023, 41706033, 41976200, 42276019) , the program for scientific research start -up funds of Guangdong Ocean University (R20020, R20023) . RM would like to gratefully acknowledge the Visiting Faculty position at IIT Bombay.

语种：英文

外文关键词：South Pacific Ocean; Ocean dynamics; Planetary waves; Sea level; Interannual variability; Seasonal variability

外文摘要：Sea level variabilities in the southwest Pacific contribute to the variations of equatorial current bifurcation and the Indonesian Throughflow transport. These processes are closely related to the recharge/discharge of equatorial heat content and dynamic distribution of anthropogenic ocean heating over the Indo-Pacific basin, thus being of profound significance for climate variability and change. Here we identify the major features of seasonal and interannual sea level variabilities in this region, confirming the dominance of the first baroclinic mode in the tropics (contributing 60%-80% of the variances) and higher baroclinic modes in the extratropics (40%-60% of the seasonal variance). Seasonally, except in the western Coral Sea where the Ekman pumping is significant, the wind-driven first-mode baroclinic Rossby waves originating to the east of the date line control the sea level variations over most tropical Pacific regions. In the domain where the 1.5-layer reduced gravity model becomes deficient, the surface heat fluxes dominate, explaining ;40%-80% of sea level variance. For interannual variability, ;40%-60% of the variance are El Nino-Southern Oscillation (ENSO) related. The wind-driven Rossby and Kelvin waves east of the date line explain ;40%-78% of the interannual variance in the tropical Pacific. Outside the tropics, small-scale diffusive processes are presumed critical for interannual variability according to a thermodynamic analysis using an eddy-permitting ocean model simulation. Further process and predictive understandings can be achieved with the coupled climate models properly parameterizing the subgrid-scale processes.