文献类型：期刊文献

中文题名：基于Omega方程的南海垂向流速诊断与对比研究

英文题名：A comparative study on Omega equation-based vertical velocity diagnosis for the South China Sea

作者：洪坤强[1];谢玲玲[1,2,3];黄家辉[1,4]

机构：[1]广东海洋大学海洋与气象学院近海海洋变化与灾害预警实验室,广东湛江524088;[2]广东省高等学校陆架及深远海气候资源与环境重点实验室,广东湛江524088;[3]粤西热带海洋生态环境野外观测研究站,广东湛江524088;[4]自然资源部湛江海洋中心,广东湛江524005

年份：2025

卷号：47

期号：12

起止页码：10

中文期刊名：海洋学报

收录：北大核心2023、、北大核心

基金：国家自然科学基金面上项目(42276019);国家重点研发课题(2024YFC2817003);广东省科技计划项目(2024B1212040008)。

语种：中文

中文关键词：南海;垂向流速;Omega方程;OFES;时空变化;eSQG

外文关键词：South China Sea;vertical velocity;Omega equation;OFES;spatio-temporal variation;eSQG

中文摘要：本文基于OFES(Ocean general circulation model For the Earth Simulator)模式0.1°×0.1°高分辨率温盐和三维流场数据,分析Omega方程在南海垂向流速诊断中的适用性和南海垂向流速的时空变化特征。结果表明,Omega方程诊断垂向流速w_(Omega)与OFES模式垂向流速w_(OFEES)在南海海盆大部分区域量级相当,约为O(10^(-5) m/s),南海北部陆架区则小一个量级。w_(Omega)和w_(OFEES)的空间相关系数r^(s)在台湾西南部(R1区)和越南以东(R2区)较大,在菲律宾西(R3区)、南海南部(R4区)以及海南岛东北部(R5区)较小。季节变化上,R1、R2和R4区r^(s)冬季大、夏季小,R3和R5区r^(s)无明显季节特征。R1和R2区是Omega方程的适用区,其w_(Omega)与w_(OFEES)的时间相关系数rt较大。各区域中形变项(S_(DEF))的贡献率均超过50%,整体大于平流项(S_(ADV)),并呈现出“上层S_(ADV)主导,下层S_(DEF)增强”的共同垂向结构,其临界深度在20~70 m之间。对比eSQG(effective Surface Quasi-Geostrophy)诊断垂向流速结果,Omega方程明显更适用于南海垂向流速的诊断。

外文摘要：Based on 0.1°×0.1°high-resolution temperature,salinity,and three-dimensional velocity data from the Ocean general circulation model For the Earth Simulator(OFES),this study analyzes the applicability of the Omega equation for diagnosing vertical velocity in the South China Sea(SCS)and the spatiotemporal variation characteristics of vertical velocity in the SCS.The results show that the vertical velocity diagnosed by the Omega equation(w_(Omega))and the OFES model vertical velocity(w_(OFES))are of comparable magnitude in most areas of the SCS basin,approximately O(10^(-5) m/s),while w_(Omega)is one order of magnitude smaller than w_(OFES)on the northern continental shelf of the SCS.The spatial correlation coefficient(r^(s))between w_(Omega)and w_(OFES)is larger in the region southwestern of Taiwan(R1)and east of Vietnam(R2),and smaller in the western Philippines(R3),the southern SCS(R4),and the northeastern region of Hainan Island(R5).In terms of seasonal variation,r^(s)is larger in winter and smaller in summer in regions R1,R2,and R4,while regions R3 and R5 show no significant seasonal characteristics in r^(s).Regions R1 and R2 are applicable areas for the Omega equation,where the temporal correlation coefficient rt between w_(Omega)and w_(OFES)is larger.In all regions,the contribution of the deformation term(S_(DEF))exceeds 50%,generally greater than the contribution of the advection term(S_(ADV)),and they exhibit a common vertical structure of“S_(ADV)dominance in the upper layer and S_(DEF)enhancement in the lower layer”,with the critical depth ranging from 20-70 m.Comparing the results of vertical velocity diagnosed by effective Surface Quasi-Geostrophy(eSQG)and the Omega equation,the Omega equation is significantly better adapted for diagnosing vertical velocity in the SCS.