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首页> 外文期刊>Estuarine Coastal and Shelf Science >Coastal oceanographic regimes of the Northern Argentine Continental Shelf (34-43°S)
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Coastal oceanographic regimes of the Northern Argentine Continental Shelf (34-43°S)

机译：阿根廷北部大陆架（34-43°S）的沿海海洋学制度

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The oceanographic regimes of the Northern Argentine Continental Shelf (NACS, 34°-43°S) are derived from advected waters of subantarctic origin, local sources of continental run-off, and a locally generated salinity maximum. Based on 3690 CTD profiles, monthly mean wind fields at coastal stations, and river discharge data, we define the oceanographic regimes over the shelf by analyzing salinity characteristics and spatial distribution: (1) a maximum in salinity (33.7-34.2) originating from the Gulf of San Matias; (2) a relative salinity minimum (30.0-33.3) of the El Rincon estuarine system; (3) a salinity minimum (0-33.0) originating in the Rio de la Plata; and (4) waters of the continental shelf (33.5 and 33.7). Temperature over the shelf is controlled by sea—air heat exchange coupled with bathymetry. An analysis of the Simpson parameter of stability (φ) provided an objective definition of a vertically homogenous coastal zone separated from seasonally stratified shelf waters south of 37°S. Bottom temperature gradients and synoptic sections in the winter and spring indicate the presence of a shallow sea front at the 40-50-m isobaths south of 37°S, persistent throughout the year. We define two seasonal periods, autumn—winter and spring—summer, based on seasonality in monthly mean winds fields, continental run-off, fresh water balance and the spatial distribution of salinity signals. Maximum seasonal variation in the extent and location of the oceanographic regimes occurs within the coastal zone. In the autumn—winter period, we observe a northward extension of the Rio de la Plata and Gulf of San Matias waters, as well as a reduction of the El Rincon and Continental Shelf waters near the coast. The spring—summer period is characterized by Rio de la Plata waters flowing to the south and east, a reduction of Gulf of San Matias waters and an invasion of El Rincon and Continental Shelf waters into the coastal areas. In a general sense, waters across the NACS undergo a seasonal oscillation in distribution and extension that implies a spring—summer reversal of the characteristic shelf-wide north—northeastward direction of flow within the coastal zone.
机译：阿根廷北部大陆架（NACS，34°-43°S）的海洋学体制来源于南极洲平流水，大陆径流的局部来源以及当地产生的最大盐度。基于3690个CTD剖面图，沿海站点的月平均风场和河流流量数据，我们通过分析盐度特征和空间分布来定义架子上的海洋学机制：（1）源自盐度的最大盐度（33.7-34.2）圣马蒂亚斯海湾； （2）艾尔林孔河口系统的最低盐度（30.0-33.3）； （3）来自里约热内卢的最低盐度（0-33.0）； （4）大陆架水域（33.5和33.7）。架子上的温度由海水-空气热交换和测深法控制。对Simpson稳定性参数（φ）的分析为从37°S以南的季节性分层陆架水分离出的垂直同质海岸带提供了客观定义。冬季和春季的底部温度梯度和天气剖面表明，在37°S以南40-50米等深处存在浅海前沿，并全年持续。根据月平均风场的季节性，大陆径流，淡水平衡和盐度信号的空间分布，我们定义了两个季节，分别是秋季和冬季，分别是冬季和春季。海洋学范围和位置的最大季节性变化发生在沿海地区。在秋季至冬季，我们观察到里约热内卢和圣马蒂亚斯海湾的水域向北延伸，而沿海岸的埃尔林孔和大陆架水域则有所减少。春季至夏季的特点是，里约热内卢的水流向南部和东部流动，圣马蒂亚斯湾的水域减少，埃尔林孔和大陆架水域侵入沿海地区。从一般意义上讲，NACS上的水域在分布和延伸过程中都会经历季节性振荡，这意味着沿海地区内陆架向北向北流动的特征是春季-夏季反转。

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