Deep and bottom water of the Bransfield Strait eastern and central basins
Deep and bottom water of the Bransfield Strait eastern and central basins
复制标题
布兰斯菲尔德海峡东部和中部盆地的深层水和底层水
DOI：
10.1029/2000jc900030
复制
发表时间：
2000-05-15
影响因子：
3.6
通讯作者：
de Bettencourt, J
中科院分区：
文献类型：
--
作者：
Gordon, AL;Mensch, M;de Bettencourt, J
1997 年 9 月获得的温度、盐度、氧气和氯氟烃 (CFC) 数据定义了布兰斯菲尔德海峡东部和中部盆地深处的通风水类型。这些水类型是在茹恩维尔岛附近观察到的，显然来自威德尔海。东部盆地底水特征与约恩维尔岛以东 50 公里处 310 dbar 深度的底水特征非常接近。东部盆地底层水是低盐度冰点陆架水（65%）和相对温暖的咸水威德尔深水（35%）的简单混合物，CFC-113:CFC-11 比龄为 8.5 年。东部盆地底层水有一个共同的来源，在中部盆地内观察到最低盐度为 1000 dbar 的弱盐度，但也可能发生从中部盆地溢流到东部盆地底部的情况。与东部盆地相比，中部盆地的底层水更冷、含盐量更高，氧气和 CFC-11 浓度更高。 CFC比年龄为7.5年的中部盆地底水由与东部盆地底水相同的威德尔水型加上儒恩维尔岛东北10公里处观测到的水体特征的高盐度冰点陆架水和少量太平洋密斜层水的大量贡献组成。组成部分（及其百分比）为威德尔深水（11%）、低盐度陆架（24%）、高盐度陆架（60%）和太平洋密斜层（5%）。
Temperature, salinity, oxygen, and chlorofluorocarbon (CFC) data obtained in September 1997 define the water types ventilating the deep eastern and central basins of the Bransfield Strait. These water types are observed adjacent to Joinville Island and are clearly derived from the Weddell Sea. The eastern basin bottom water characteristics closely match that of the bottom water at 310 dbar depth similar to 50 km east of Joinville Island. The eastern basin bottom water is a simple mixture of low-salinity freezing point shelf water (65%) and relatively warm saline Weddell Deep Water (35%), with a CFC-113: CFC-11 ratio age of 8.5 years. The eastern basin bottom water shares a common origin with a weak salinity minimum observed at 1000 dbar within the central basin, though overflow from the central basin to the eastern basin floor may also occur. The bottom water within the central basin is colder and saltier with higher concentrations of oxygen and CFC-11 than that of the eastern basin. The central basin bottom water with a CFC ratio age of 7.5 years is composed of same Weddell water types that form the eastern basin bottom water plus a large contribution of high-salinity freezing point shelf water of the characteristics of water observed 10 km northeast of joinville Island and a small amount of Pacific pycnocline water. The components (and their percentage) are Weddell Deep Water (11%), low-salinity shelf (24%), high-salinity shelf (60%), to Pacific pycnocline (5%).