Barotropic Response of the Sea of Okhotsk to Wind Forcing
Barotropic Response of the Sea of Okhotsk to Wind Forcing
复制标题
鄂霍次克海对风力强迫的正压响应
DOI：
10.1023/a:1022879314764
复制
发表时间：
2002
影响因子：
2.3
通讯作者：
K. Ohshima
中科院分区：
文献类型：
--
作者：
D. Simizu;K. Ohshima
我们研究了鄂霍次克海的风致环流，使用了一个分辨率为9.25 km的包含真实地形的正压模式。利用欧洲中期天气预报中心（ECMWF）逐日再分析资料计算的逐月风应力场作为强迫，进行20天的积分，直至环流达到基本稳定状态。以11月为例（代表10月至3月的冬季），速度为0.1-0.3 m s - 1的南流沿着库页岛东部的底部轮廓出现。洋流主要局限于大陆架（浅于200米），并向南延伸至北海道海岸。在7月的情况下（代表4月至9月的夏季），即使在浅大陆架也没有明显的洋流。模拟的库页岛东部陆架上的南向流似乎与地面漂流者观测到的东库页岛洋流（ESC）的近岸分支相对应。实验模拟的这些季节变化与ESC的观测结果是一致的。在动力学上，模拟的ESC被解释为捕获地形波（ATW）， ATW是由稳定的沿海风应力驱动的海岸捕获流。冬季模拟ESC在陆架上的体积输运约为1.0 Sv (1 Sv = 106 m3s−1)，这是由陆架波传播方向的陆地综合Ekman输运决定的。
We have examined wind-induced circulation in the Sea of Okhotsk using a barotropic model that contains realistic topography with a resolution of 9.25 km. The monthly wind stress field calculated from daily European Centre for Medium-Range Weather Forecasting (ECMWF) Re-Analysis data is used as the forcing, and the integration is carried out for 20 days until the circulation attains an almost steady state. In the case of November (a representative for the winter season from October to March), southward currents of velocity 0.1–0.3 m s−1 occur along the bottom contours off the east of Sakhalin Island. The currents are mostly confined to the shelf (shallower than 200 m) and extend as far south as the Hokkaido coast. In the July case (a representative for the summer season from April to September), significant currents do not occur, even in the shallow shelves. The simulated southward current over the east Sakhalin shelf appears to correspond to the near-shore branch of the East Sakhalin Current (ESC), which was observed with the surface drifters. These seasonal variations simulated in our experiments are consistent with the observations of the ESC. Dynamically, the simulated ESC is interpreted as the arrested topographic wave (ATW), which is the coastally trapped flow driven by steady alongshore wind stress. The volume transport of the simulated ESC over the shelf reaches about 1.0 Sv (1 Sv = 106 m3s−1) in the winter season, which is determined by the integrated onshore Ekman transport in the direction from which shelf waves propagate.
影响因子：
3.5
作者：
LARGE, WG;POND, S
通讯作者：
POND, S