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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Origin and ages of mode waters in the Brazil-Malvinas Confluence region during austral winter 1994
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Origin and ages of mode waters in the Brazil-Malvinas Confluence region during austral winter 1994

机译：1994年南方冬季，巴西-马尔维纳斯河合流地区现代水的起源和年龄

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摘要

The ventilation of the main thermocline associated with the formation of Subtropical Mode Water (STMW) and Subantarctic Mode Water (SAMW) within the Brazil/Malvinas Confluence region is investigated using satellite data, hydrographic data, and dissolved CFCs as transient tracers. During the winter of 1994, two types of STMW were observed. Both types, 26.24 #sigma#_#theta# and 26.46 #sigma#_#theta# were formed within the warm pool of the South Atlantic Central Water (SACW). The SAMW is found on the 27.10 #sigma#_#theta# density surface. This surface lies in the minimum salinity layer of the Antarctic Intermediate Water (AAIW). The mode waters are dated using CFC ratios. To our knowledge, this is the first estimate of the age of the mode waters in the region using the CFC-113:CFC-11 ratio method. The lighter STMW was being formed during the cruise. The heavier STMW was found to be 6 +- 3 years old and is thought to have circulated in the subtropical gyre without losing its primary properties. The SAMW, or the lightest AAIW has an age of 3 +- 2 years. This water is very young compared with the oldest (10 +- 5 years) and heaviest component of the AAIW, which circulates within the subtropical gyre. The formation of the STMW in the confluence region is dependent on the southward extension of the Brazil Current.
机译：使用卫星数据，水文数据和溶解的CFC作为瞬时示踪剂，研究了巴西/马尔维纳斯汇合区域内与亚热带模式水（STMW）和亚南极模式水（SAMW）形成相关的主要温跃层的通风。在1994年冬季，观察到两种类型的STMW。两种类型，即26.24＃sigma＃_theta＃和26.46 #sigma＃_＃theta＃均在南大西洋中央水域（SACW）的温水池中形成。 SAMW位于27.10＃sigma＃_theta＃密度表面上。该表面位于南极中间水（AAIW）的最小盐度层中。模式水使用CFC比标明日期。据我们所知，这是使用CFC-113：CFC-11比率方法对该地区的模范水域年龄的首次估计。巡航期间正在形成较轻的STMW。较重的STMW被发现具有6 +-3年的历史，并且被认为在亚热带回旋中循环而没有失去其主要特性。 SAMW或最轻的AAIW的年龄为3±2岁。与在亚热带回旋内循环的AAIW中最古老的（10 +-5年）和最重的水相比，它非常年轻。汇合区STMW的形成取决于巴西洋流的向南延伸。

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