海洋科学2024，Vol.48Issue(1)：1-10,10.DOI:10.11759/hykx20220921003
基于卫星海面高度资料的太平洋海区涡旋能谱分析
Power spectra analysis of Pacific Ocean eddies based on sat-ellite altimeter data
摘要
Abstract
Assuming homogeneity and isotropy,geostrophic turbulence theory proposes that the eddy kinetic energy follows a power law k-n with the scale distribution.However,the actual ocean is affected by various factors,such as boundaries,topography,and stratification.These elements introduce nonhomogeneous and anisotropic characteris-tics.To reconcile theory with observations,we conducted an analysis based on 30 years of altimeter data.We esti-mated the wavenumber spectrum of sea surface height anomalies(SSHAs)in different regions:tropical,subtropical,and mid-high latitudes.Following this,we evaluated the spectral slope using linear regression in the mesoscale band.The results reveal that the SSHA wavenumber spectrum steepens from the equator toward middle and high latitudes.Simultaneously,its slope decreases from-4 to-5,which agrees well with the equatorial linear wave the-ory.We found a zonal and meridional difference in the slope of the SSHA wavenumber spectrum.For instance,in the equatorial region,the zonal spectrum appears steeper than the corresponding meridional spectrum.Conversely,in the Antarctic Circumpolar Current region,the meridional spectrum slope exceeds that of the zonal spectrum.This anisotropy in the slope of the SSHA wavenumber spectrum indicates that the mesoscale motion of the ocean is af-fected by the beta effect,resulting in considerable meridional and zonal differences.In conclusion,our results demonstrate that the mesoscale motion of the ocean oscillates between quasi-two-dimensional and three-dimensional states.Therefore,it cannot be adequately described by a global turbulence theoretical model.关键词
海面高度/中尺度涡旋/地转湍流/波数-频率谱/谱斜Key words
sea surface height/mesoscale eddy/geostrophic turbulence/wavenumber-frequency spectrum/spectral slope分类
海洋科学引用本文复制引用
华峻巍,王法明..基于卫星海面高度资料的太平洋海区涡旋能谱分析[J].海洋科学,2024,48(1):1-10,10.基金项目
国家自然科学基金项目(41776035) （41776035）
山东省自然科学基金项目(ZR2021MD024) （ZR2021MD024）
崂山实验室科技创新项目(LSKJ202202400)Natural Science Foundation of China,No.41776035 （LSKJ202202400）
Shandong Provincial Natural Science Foundation,No.ZR2021MD024 （）
Foundation of Laoshan Laboratory,No.LSKJ202202400 （）
