排序方式： 共有2条查询结果，搜索用时 46 毫秒
1
1.
The origin of the Ryukyu Current(RC) and the formation of its subsurface velocity core were investigated using a 23-year(1993–2015) global Hybrid Coordinate Ocean Model(HYCOM) dataset. The volume transport of the RC comes from the Kuroshio eastward branch(KEB) east of Taiwan and part of the North Pacific Subtropical Gyre(pNPSG). From the surface to 2 000 m depth, the KEB(p-NPSG) transport contributes 41.5%(58.5%) to the mean total RC transport. The KEB originally forms the subsurface velocity core of the RC east of Taiwan due to blockage of the subsurface Kuroshio by the Ilan Ridge(sill depth: 700 m). Above 700 m, the Kuroshio can enter the East China Sea(ECS) over the Ilan Ridge, meanwhile, the blocked Kuroshio below 700 m turns to the right and flows along the Ryukyu Islands. With the RC flowing northeastward, the p-NPSG contribution strengthens the subsurface maximum structure of the RC owing to the blockage of the Ryukyu Ridge. In the surface layer, the pNPSG cannot form a stable northeastward current due to frequent disturbance by mesoscale eddies and water exchange through the gaps(with net volume transport into ECS) between the Ryukyu Islands. 相似文献
2.
夏季, 越南以东海域经常出现一对气旋涡和反气旋涡, 被称为越东偶极子(dipole off eastern Vietnam, DEV)。在DEV之间有一支东向离岸急流(eastward offshore jet, EOJ)。DEV-EOJ能显著提高该海域叶绿素浓度并改变浮游植物结构分布。DEV一般于夏季产生, 秋季消亡, 其气旋涡中心低温高盐, 反气旋涡中心高温低盐。DEV-EOJ的生消机制与西南季风密切相关, 同时也受到厄尔尼诺-南方涛动(El Ni?o-Southern oscillation, ENSO)等大洋尺度大气变化影响。目前, 虽然对DEV-EOJ已取得一定认识, 但仍有下述问题亟待解决: 1) DEV对南海中层动力和生态环境的影响; 2) DEV对南海西南部深层环流的作用; 3) 大尺度海气现象影响DEV-EOJ的过程及动力机制。建议开展长期的大面积同步阵列观测解决以上悬而未决的科学问题。 相似文献
1