南海中尺度涡边缘亚中尺度过程模式研究  

The Simulation of Submesoscale Processat the Periphery of a Mesoscale Eddy in the South China Sea

作　　者：冀承振 叶瑞杰[1] 董济海[1] 张志伟[1] 田纪伟[1] 

机构地区：[1]中国海洋大学物理海洋实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第1期1-6,共6页Periodical of Ocean University of China

基　　金：国家重点基础研究发展计划项目(2014CB745003)资助~~

摘　　要：基于高分辨率ROMS模式数据,对南海中尺度涡边缘的亚中尺度过程进行了研究。结果表明:在中尺度涡边缘处存在明显的温度细丝结构,涡度值要明显大于1,O^W参数趋于正值,即在涡旋边缘存在强速度剪切,加强了涡丝的形成。对亚中尺度过程动能空间分布分析发现,中尺度涡边缘区域动能所占的比例大约为88.4%,比中心区域动能所占的比例11.6%要大许多。从动能谱的分析来看,在中尺度涡边缘处动能谱的斜率趋近于k-2,与表层准地转理论(SQG)相吻合,而在中心处呈现k^(-3),与准地转理论(QG)相一致。The study investigates thesubmesoscale process at a mesoscale eddy in South China Sea（SCS）based on high-resolution ROMS model.The results show that,at the periphery of themesoscale eddy,there exists obvious temperature filaments,the vorticity value is significantly greater than 1,and O-W parameter tends to be positive,all of these evidences meanthat the shear of velocity is much stronger and strengthen the formation of vortex filaments.From the view ofkinetic energy＇s distribution,for submesoscale process,the proportion at the periphery of the eddy（RR1and RR3）is 88.4%,which is larger than that at the center（RR2,only 11.6%）.The results of kinetic energy spectra indicate that the slope of the spectra at the periphery of the eddy holds k^（-2） regime,which is more likely with surface quasi-geostrophic（SQG）,while the slope exhibits k^（-3） law at the eddy＇s center,consistent with quasi-geostrophic（QG）theory.

关 键 词：亚中尺度过程 中尺度涡 动能谱 ROMS模式 

分 类 号：P722.7[天文地球—海洋科学]