三次黑潮大弯曲形成机制的分析  

Formation Mechanisms of the Three Kuroshio Large Meanders

作　　者：夏瑞彬[1] 刘秦玉[1] 许丽晓[1] 

机构地区：[1]中国海洋大学物理海洋教育部重点实验室,山东省高校海洋-大气相互作用与气候重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2013年第5期1-7,共7页Periodical of Ocean University of China

基　　金：国家重大科学研究计划项目(2012CB955602);国家重点基础研究发展计划项目(2010CB428904);国家自然科学基金重点项目(40830106)资助

摘　　要：通过对HYbrid Coordinate Ocean Model(HYCOM)高分辨率海洋环流模式(1/12°)数值模拟结果的分析发现,该模式对1993—2003年的模拟结果出现了3次显著的黑潮大弯曲现象。研究表明,日本以南这3次黑潮大弯曲路径的形成与2种机制有关:沿30°N西传的海洋Rossby波将太平洋145°E附近海面高度正异常信号传到九州岛东南海域是第二次黑潮大弯曲的主要形成机制;而冲绳海槽北部海水的位势涡度负异常则有利于九州岛东南反气旋再循环流海域海面高度正异常,有助于第一次和第三次黑潮大弯曲路径的形成。A high resolution （1/12°） HYbrid Coordinate Ocean Model （HYCOM） simulation,is used to investigate the variations and mechanism of the Kuroshio large meander. According to the model, we can find that there are three obviously large meanders from 1993 to 2003 in the model. The formation and development of the three Kuroshio large meanders are related to two mechanisms： the ocean Rossby waves with SSH positive anomaly near 145° E of the Pacific Ocean propagating from the east to southeast of Kyushu along 30° N, is the major mechanism for the second large meander; while the potential vorticity （PV） negative anomaly at the northern side of the okinawa through which causes the SSH positive anoma- ly in the ＇anticyclone recirculation gyre southeast of Kyushu, is conducive to the formation and develop- ment of the first and third large meander.

关 键 词：黑潮 大弯曲 海表面高度 位势涡度 ROSSBY波 

分 类 号：P731.21[天文地球—海洋科学]