The barrier layer in the western Tropical Atlantic Ocean
The barrier layer in the western Tropical Atlantic Ocean
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DOI：
10.1029/1999gl900492
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发表时间：
1999-07-15
影响因子：
5.2
通讯作者：
Gouriou, Y
中科院分区：
文献类型：
--
作者：
Pailler, K;Bourlès, B;Gouriou, Y
在热带海洋中，上层温度大致均匀，盐度的垂直变化可能是造成显着密度分层的原因。这项对热带大西洋西部的研究表明，亚马逊河排放的淡水表层水可能会在 3-30 m 深度范围内引起强烈的盐跃层。这种盐跃层会产生密变斜层，充当地表水和地下水之间混合的屏障。新鲜的地表水通常与海面温度的正异常相关。在亚马逊河流量达到最大之后，这些正异常覆盖了北半球夏秋季节的大部分盆地，这可能对海洋-大气交换具有重要意义。
In the tropical oceans, where the temperature is roughly homogenous in the upper layer, vertical variations of salinity may be responsible for significant density stratifications. In this study on the western Tropical Atlantic Ocean, it is shown that fresh surface waters of the Amazon River discharge may induce a strong halocline in the 3-30 m depth range. This halocline induces a pycnocline that acts as a barrier for mixing between the surface and the subsurface waters. The fresh surface waters are generally associated with positive anomalies of the sea surface temperature. These positive anomalies cover a large part of the basin in boreal summer-fall, following the maximum Amazon River discharge, which may have a significant importance for the ocean-atmosphere exchanges.