摘要
吕宋海峡以东即北太平洋热带地区常年存在着大量的涡旋,这些涡旋在向西运动的过程中遇到吕宋海峡黑潮后是否会穿越黑潮进入南海值得研究。文章用数值模式来模拟吕宋海峡的黑潮以及吕宋海峡以东的众多涡旋,结果表明没有一个涡旋可以穿越吕宋海峡进入南海。在此基础上引入了一个理想台风风场,通过风应力旋度的形式驱动出强劲的气旋式和反气旋式涡旋,这两个涡旋分别添加在源区黑潮附近,也是在源区黑潮流量最小的8月。以往研究表明,黑潮流量小而涡旋强劲的时候涡旋容易穿越吕宋海峡进入南海,但由何种原因产生的涡旋可以穿越吕宋海峡难以确定;而文章的数值计算结果表明,即使在黑潮较弱的夏季8月,由风应力旋度产生的中尺度涡,无论是气旋式还是反气旋式,都受到了吕宋海峡的阻挡而难以穿越。
There are many westward-propagating eddies in the subtropical regions in the North Pacific Ocean; therefore, it is worth studying whether these eddies can travel across the Kuroshio and through the Luzon Strait （LS）. In this paper, a numerical model is employed to simulate the Kuroshio in the vicinity of the LS and the eddies east of the LS. Our results show that none of these eddies can propagate through the LS and enter the South China Sea （SCS）. On this basis, an idealized typhoon is added to the model. Strong cyclonic and anticyclonic eddies can be generated by the positive and negative typhoon wind stress curl, respectively. Each eddy so generated is located near the source region of the Kuroshio in August when the volumetric transport of the Kuroshio is minimal. Previous studies indicated that these eddies are more likely to penetrate through the LS when the Kuroshio transport is low; however, it remains unclear which factor plays the dominating role in pushing eddies through the LS. Our study indicates that, although the Kuroshio is the weakest in August, all eddies generated through the wind stress forcing, either cyclonic or anticyclonic, are blocked by the Kuroshio and cannot penetrate through the LS to enter the SCS.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2013年第2期66-73,共8页
Journal of Tropical Oceanography
基金
中国科学院海洋研究所环流与波动重点实验室基金资助项目(5211641)
关键词
黑潮
数值模拟
理想台风
中尺度涡
Kuroshio
numerical simulation
ideal typhoon
mesoscale eddy
