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长江冲淡水扩展区域孤立水团分析
卢军炯, 李博, 王鹏皓, 王寇
浙江海洋大学
摘要:
本文通过2017年5月长江口外海域的实测资料,研究了孤立低盐水团的三维结构以及输运过程,并进一步统计了孤立水团发生的历史事件。低盐水团的水文参数在未脱离前于上层呈现同心圆等值区分布。研究发现,大潮引起的强上升流对低盐水团的脱离起到决定性的作用。孤立低盐水团的生消周期为7至10天,其脱离和输运受长江径流、风场等的影响,偏北风和偏南风对水团输运分别起到抑制和促进作用。低盐水团的脱离及输运过程极大加强了冲淡水跨锋面的营养盐和陆源有机物的输运,进一步丰富了对长江冲淡水输运过程的研究。
关键词:  长江冲淡水  低盐水团  三维结构  输运
DOI:10.11693/hyhz20190500096
分类号:
基金项目:自然基金委经费资助项目,4170622号;舟山科技局资助项目,2018C21023号; 国家重点研发计划,2017YFA0604902号;
Analysis of isolated water mass off Changjiang Diluted Water expansion area
lujunjiong, libo, wangpenghao, wangkou
Zhejiang Ocean University
Abstract:
Based on in-situ observation off the Changjiang estuary in May 2017 and associated satellite-derived data, the three-dimensional structure and transport process of isolated low-salinity water mass are investigated. Historic low-salinity water mass detachment events are also studied, which shows that the strong upwelling caused by tides dominates the detachment of low-salinity water mass. The hydrological parameters of the water mass, later detached, present concentric circles distribution in the upper layer. The life cycle of isolated low-salinity water mass is 7 to 10 days, whose detachment and transport of are affected by the Changjiang runoff, wind field and so on. The northerly and southerly wind inhibit and promote the transport process respectively. Detached low-salinity water mass enhances transport of nutrients and organic matter with diluted water, which enriches our understanding of the detachment and transport of the low-salinity water mass off the Changjiang estuary.
Key words:  Changjiang Diluted Water  low-salinity water mass  3-D structure  transport
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