Surface current variability east of Okinawa Island obtained from remotely sensed and in situ observational data
Surface current variability east of Okinawa Island obtained from remotely sensed and in situ observational data
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DOI：
10.1029/2000jc000784
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发表时间：
2001-12-15
影响因子：
3.6
通讯作者：
Fujii, S
中科院分区：
文献类型：
--
作者：
Hisaki, Y;Tokeshi, T;Fujii, S
1998 年春天，我们利用现场和遥感数据（包括从高频海洋雷达推断的表面速度估计值）调查了冲绳岛东部地区的海洋表面流变化。之前大多数利用高频海洋雷达的研究仅限于浅层大陆架。相比之下，本研究的大部分观测区域位于公海。在观测期间，高频海洋雷达对反气旋和气旋中尺度涡流彼此相邻的区域进行了采样。高频雷达产生的洋流与海流计测量的一致。表面流在时间和空间上变化很大，并受到近海区域涡流场的影响。电流场与近地表水温有关。例如，局部气温升高通常与东北流有关。 1000 m左右浅海区域的海表流与当地风力强迫有显着的相关性。我们的高频海洋雷达经常检测到一个强汇聚区域，该区域的特征与之前研究中描述的区域不同，因为它位于深海。根据国家海洋和大气管理局先进的超高分辨率辐射计图像等其他数据，我们得出结论，会聚区是由中尺度涡流锋面造成的。
We investigated ocean surface current variability in the region east of Okinawa Island in the spring of 1998 using in situ and remotely sensed data including surface velocity estimates inferred from HF ocean radars. Most previous studies utilizing HF ocean radars were limited to shallow continental shelves. In contrast, most of the observation area in this study was in the open ocean. During the observation period the HF ocean radars sampled a region where anticyclonic and cyclonic mesoscale eddies were adjacent to each other. The HF-radar-derived ocean currents agree with those measured by a current meter. The surface currents were highly variable in both time and space and were affected by the eddy field in the offshore region. The current field was related to the near-surface water temperature. For example, a local temperature rise was often associated with northeastward flows. The surface currents in regions shallower than about 1000 m had a significant correlation with local wind forcing. Our HF ocean radars often detected a strongly convergent zone, which was different in character from those described in previous studies in that it was in the deep ocean. From other data such as National Oceanic and Atmospheric Administration advanced very high resolution radiometer imagery, we concluded that the convergent zone was due to mesoscale eddy fronts.