The influence of the Plata River discharge on the western South Atlantic shelf
The influence of the Plata River discharge on the western South Atlantic shelf
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DOI：
10.1029/2004gl021638
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发表时间：
2005-01
影响因子：
5.2
通讯作者：
A. Piola;R. Matano;E. Palma;O. O. Möller-O.;E. Campos
中科院分区：
文献类型：
--
作者：
A. Piola;R. Matano;E. Palma;O. O. Möller-O.;E. Campos
普拉塔河是南美洲第二大河流，其影响沿着1300公里的沿海地带延伸。结合历史水文和风资料和数值模拟，确定了Plata羽流的季节和年际变化及其与河流流量大小和风应力强度和方向的关系。研究结果表明，河流羽流的季节变化受风应力沿岸分量的控制。在El Niño期间，风和降水异常的影响倾向于相互补偿，防止了与大外流事件相关的异常东北向羽流扩展。数值实验证实了这一发现，并表明在El Niño期间，普拉塔河的排放物向近海扩散。
The influence of the Plata, the second largest river in South America, extends along a coastal strip of 1300 km. Historical hydrographic and wind data and numerical simulations are combined to determine the seasonal and interannual variability of the Plata plume and its relationship to the magnitude of the river discharge and the intensity and direction of the wind stress. Our results indicate that the seasonal variability of the river plume is controlled by the alongshore component of the wind stress. During El Niño the effects of the wind and precipitation anomalies tend to compensate each other, preventing anomalous northeastward plume extensions associated to large outflow events. Numerical experiments confirm this finding and indicate that during El Niño the discharge from the Plata River spreads offshore.