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Upper-Ocean lateral heat transports in the Nino3.4 Region and Their Connection with ENSO

Journal of Meteorological Research 2022年第2期36卷 360-373页

作者： He ZHAO Tongwen WU Laurent ZXLI Fanghua WU Weihua JIE Xiangwen LIU Ronghua ZHANG Chengjun XIE Chinese Academy of Meteorological Sciences China Meteorological AdministrationBeijing 100081China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing Climate Center China Meteorological AdministrationBeijing 100081China Laboratoire de Météorologie Dynamique Centre National de la Recherche ScientifiqueSorbonne UniversitéEcole Normale SupérieureEcole PolytechniqueParis 75252France Key Laboratory of Ocean Circulation and Waves Institute of Oceanologyand Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Center for Excellence in Quaternary Science and Global Change Chinese Academy of SciencesXi’an 710061China

In the Nino3.4 region(tropical Pacific,5°S-5°N,170°-120°W),sea surface temperature(SST)changes are highly correlated with temperature variations in the upper 40-m *** study explores the upper-ocean heat budget in the Nino3.4 region using Ocean Reanalysis System 5(ORAS5)monthly data from 1979 to 2018,with a focus on ocean heat transports at lateral boundaries in the top 40-m layer and their correlation with temperature *** the region,there is a well-defined structure of opposite meridional circulation in the upper and lower parts of the thermocline,characterized by divergence in the upper layer above 40 m and convergence in the lower *** change of mean temperature in the upper layer is determined by the sum of zonal,meridional,and vertical heat transports,which,however,tend to largely compensate for each *** general,part of the surface heat flux from the atmosphere to the ocean and the heat transport from the subsurface ocean are transported out of the domain by meridional and zonal currents,leaving only a tiny part to warm or cool the upper *** amplitude of the net surface heat flux effective for the entire 40-m layer of the ocean is weaker than the lateral heat *** an interannual timescale,variations of heat transports in both zonal and meridional are positively correlated with temperature anomalies,while the vertical heat transport from the subsurface ocean is negatively *** analyses for five El Nino events and five La Nina events also revealed that there is a positive contribution of horizontal transport convergence to temperature anomalies during the evolution of El Nino(warming)and La Nina(cooling),while vertical transport acts against temperature variations.

关键词： heat budget lateral heat transport surface heat flux Ni?o3.4 region El Nino–Southern Oscillation(ENSO)

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