Zhu Dedi, Pan Yuqiu, Xu Weiyi, Chen Qiaoyun
Key Laboratory of Ocean Dynamic Processes and Satellite Oceanography, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China.
Ying Yong Sheng Tai Xue Bao. 2003 Jul;14(7):1131-4.
Based on survey data, this paper analysed the hydrologic characteristics of HAB frequent occurrence area in the outer Changjiang River estuary. The results showed that this area is an area in which the plume front with a salinity of 17-30 in the outer Changjang River estuary, the divergent surface current of the plume front and the upwelling of the high salinity Taiwan bottom warm current are coexisted. In Spring and Summer, the diluted Changjiang River water of this area changed its flow direction under the effect of southwest-northeastward current, possibly due to the large runoff from the Changjiang River to the sea. The upwelling usually occurred at the west side slope between the first turning point and the deep slot top of the outer Changjiang River estuary. This turning point was on the north side in Spring and on the south side in Summer, but in Autumn, no turning point was existed, possibly due to the small runoff. The distribution characteristics of residual current in Spring and Summer was that the adjacent area of plume front was the convergent area of surface and bottom currents, the surface residual current in the upwelling area was at divergent, and the bottom residual current had the characteristics of converging toward the Changjiang River estuary along the deep slot.
基于调查数据，本文分析了长江口外赤潮频发区的水文特征。结果表明，该区域是长江口外盐度为17 - 30的羽状锋、羽状锋的表层辐散流以及高盐度台湾底层暖水上升流共存的区域。在春季和夏季，该区域稀释的长江水在西南 - 东北向海流的作用下改变流向，这可能是由于长江径流量大导致的。上升流通常发生在长江口外第一个转折点与深槽顶部之间的西侧边坡处。这个转折点春季在北侧，夏季在南侧，但秋季不存在转折点，这可能是由于径流量小所致。春季和夏季余流的分布特征是，羽状锋相邻区域是表层和底层海流的辐合区，上升流区域的表层余流呈辐散状，底层余流具有沿深槽向长江口汇聚的特征。
