东海黑潮温度锋的三维结构特征分析  

Three-dimensional structure characteristics of Kuroshio thermal front in the East China Sea

作　　者：王兴宇 纪棋严 彭腾腾 林夏艳 贾晓燕 韩磊 WANG Xingyu;JI Qiyan;PENG Tengteng;LIN Xiayan;JIA Xiaoyan;HAN Lei(Zhejiang Ocean University,Zhoushan 316022 China)

机构地区：[1]浙江海洋大学海洋科学与技术学院,浙江舟山316022

出　　处：《海洋预报》2022年第1期67-79,共13页Marine Forecasts

基　　金：国家重点研发计划(2016YFC1401605);国家自然科学基金(41806004、41806030)。

摘　　要：结合卫星遥感海表温度、三维再分析温度资料和数值模拟结果,研究了东海黑潮温度锋从海表到底层的三维结构特征。结果表明:东海黑潮海表温度锋在冬季和春季较强,秋季次之,夏季消失。多年平均的东海黑潮海表温度锋区范围主要在70~700 m水深区域,温度锋的中心线与黑潮的流轴大致平行,在济州岛以南的黑潮中段区域有北上的分支。受台湾暖流、黑潮及其分支的共同影响,在200 m以浅区域,东海黑潮温度锋在冬季和春季从海表到海底常年存在,夏季和秋季主要出现在水深50 m以下水层。东海黑潮和底层陆架水形成显著的温度锋,位置在顺着黑潮流向的左侧及下方深度为100~700 m的陆架区域,该区域的温度锋强度比同一位置的海表温度锋的强度大。受黑潮的路径、流幅宽度、深度和速度大小的影响,东海黑潮温度锋在陆架区域的影响深度兼具区域性差异和季节性差异,一般比黑潮流速0.2 m/s的到达深度深200 m左右,甚至可以影响到水深1000 m左右。Based on satellite remote sensing sea surface temperature data,three-dimensional reanalysis temperature data and numerical simulation results,the three-dimensional structure characteristics of Kuroshio thermal front in the East China Sea are studied in this paper.The Kuroshio thermal front at the sea surface in winter and spring are stronger than that in autumn and disappears in summer.The annual mean SST front zones mainly located in the area of water depth of 70~700 m.The core line of the thermal front is roughly parallel to the current axis of the Kuroshio with a northward branch in the middle region of the Kuroshio to the south of Jeju Island.The Kuroshio thermal front in the East China Sea is affected by the Taiwan Warm Current,the Kuroshio and its branches.It always exists from the surface to the bottom in winter and spring where the water is shallower than 200 m,while it mainly appears below 50 m in summer and autumn.The Kuroshio and the shelf water in the East China Sea can also form significant thermal front,which is located at the bottom-left side of the Kuroshio on the shelf area with a depth of 100~700 m.The intensity of the thermal front in this area is larger than that of the sea surface thermal front at the same location.Affected by the path,current amplitude,depth and velocity of the Kuroshio,the impact depth of Kuroshio thermal front in the East China Sea reveals both regional and seasonal differences.The front is generally 200 m deeper than the arrival depth of the Kuroshio’s velocity of 0.2 m/s,and can even reach the depth of about 1000 m.

关 键 词：东海 黑潮 温度锋 三维结构特征 

分 类 号：P731.27[天文地球—海洋科学]