A Model Study of the Circulation in the Pearl River Estuary (PRE) and Its Adjacent Coastal Waters: 2. Sensitivity Experiments
A Model Study of the Circulation in the Pearl River Estuary (PRE) and Its Adjacent Coastal Waters: 2. Sensitivity Experiments
复制标题
DOI：
10.1029/2002jc001452
复制
发表时间：
2003-05
影响因子：
--
通讯作者：
L. Wong;J. Chen;H. Xue;L. Dong;W. Guan;Jilan Su
中科院分区：
文献类型：
--
作者：
L. Wong;J. Chen;H. Xue;L. Dong;W. Guan;Jilan Su
[1]利用普林斯顿海洋模式研究了珠江口及其邻近沃茨海域冬、夏季的环流特征。Wong等人[2003]将模拟结果与珠江口污染项目（PREPP）期间收集的现场测量结果进行了比较。在本文中，进行了敏感性实验，以检查羽和相关的锋面动力学响应季节性排放和季风。在冬季，向海扩散的羽状水和含盐的沿海水之间的会聚建立了一个盐度锋，在PRE内从东北向西南排列。夏季，受西南季风影响，羽状水在表层填充PRE，并向东扩散到沿海沃茨。烟柱的总体排列是从西北到东南。次表层锋与冬季和夏季相似，只是夏季锋更靠近河口，冬季锋更靠近河口头部。在PRE内部，底流总是朝向河口的头部，归因于与羽流锋相关的密度梯度。相反，冬季陆架的底层流从近海向夏季向岸上变化，分别反映了冬季的下降流和夏季的上升流。风在控制地表羽流方面也起着至关重要的作用。无论冬夏，东风都把烟柱吹向西。在夏季，烟羽向东扩散可归因于风的偏南分量。另一方面，羽流的表面积与排放量成正比。
[1] The Princeton Ocean Model is used to study the circulation in the Pear River Estuary (PRE) and the adjacent coastal waters in the winter and summer seasons. Wong et al. [2003] compares the simulation results with the in situ measurements collected during the Pearl River Estuary Pollution Project (PREPP). In this paper, sensitivity experiments are carried out to examine the plume and the associated frontal dynamics in response to seasonal discharges and monsoon winds. During the winter, convergence between the seaward spreading plume water and the saline coastal water sets up a salinity front that aligns from the northeast to the southwest inside the PRE. During the summer the plume water fills the PRE at the surface and spreads eastward in the coastal waters in response to the prevailing southwesterly monsoon. The overall alignment of the plume is from the northwest to the southeast. The subsurface front is similar to that in the winter and summer except that the summer front is closer to the mouth and the winter front closer to the head of the estuary. Inside the PRE, bottom flows are always toward the head of the estuary, attributed to the density gradient associated with the plume front. In contrast, bottom flows in the shelf change from offshore in winter to onshore in summer, reflecting respectively the wintertime downwelling and summertime upwelling. Wind also plays an essential role in controlling the plume at the surface. An easterly wind drives the plume westward regardless winter or summer. The eastward spreading of the plume during the summer can be attributed to the southerly component of the wind. On the other hand, the surface area of the plume is positively proportional to the amount of discharge.