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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >On the sources of Weddell Gyre Antarctic Bottom Water
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On the sources of Weddell Gyre Antarctic Bottom Water

机译：关于韦德尔涡旋南极底水的来源

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In March-April 1995, as part of the World Ocean Circulation Experiment section A23, we completed 49 hydrographic stations across the Weddell Gyre and southern Antarctic Circumpolar Current, from the Antarctic continental shelf (72.5 degrees S, 16.5 degrees W) to South Georgia (55 degrees S, 34.5 degrees W). Chlorofluorocarbon (CFC-11, CFC-12, and CFC-113) data collected at these stations reveal that distinct sources renew the Antarctic Bottom Water (defined as waters with potential temperatures less than 0 degrees C) of the Weddell Gyre. Weddell Sea Bottom Water (defined as waters with potential temperatures less than -0.7 degrees C) formed in the western Weddell Sea has CFC concentrations about 5 to 6 times higher in the eastward flowing northern Weddell Gyre than in the westward flowing southern limb. Our CFC measurements suggest that distinct sources of Weddell Sea Bottom Water exist:in,the western Weddell Sea, in agreement with previous descriptions based on potential temperature and salinity signals. In the northern Weddell Gyre, high CFC concentrations in Weddell Sea Deep Water, potential temperatures between 0 degrees C and -0.7 degrees C, confirm the long-recognized sources for this water mass in the western and southwestern Weddell Sea. In the southern Weddell Gyre at about 20 degrees W and along the Antarctic continental slope, Weddell Sea Deep Water with potential temperatures around -0.45 degrees C shows a deep CFC maximum about 1000 m above the seafloor. CFC concentrations in this deep southern core are about 80% of those of new Weddell Sea Deep Water in the northern Weddell Gyre near 30 degrees W. The A23 CFC and hydrographic data are not consistent with the hypothesis that Weddell Sea Deep Waters are derived from a single source in the western Weddell Sea, Instead, these tracers suggest that an important portion of the Weddell Sea Deep Water in the southern Weddell Gyre originates outside the western Weddell Sea, probably near the Amery Basin and environs, around 75 degrees E. These features of the circulation and renewal of the deep Weddell Gyre should be carefully considered in simulations dealing with fluxes; pathways, and formation rates of Antarctic Bottom Water. [References: 46]
机译：1995年3月至4月，作为世界海洋环流实验A23部分的一部分，我们完成了49个水位测量站，这些水位横跨Weddell Gyre和南极南极洲洋流，从南极大陆架（南纬72.5度，西风16.5度）到乔治亚州南部（ 55度S，34.5度W）。在这些站点收集的氯氟烃（CFC-11，CFC-12和CFC-113）数据表明，不同的来源更新了Weddell Gyre的南极底水（定义为潜在温度低于0摄氏度的水）。韦德海西部形成的韦德尔海底水（定义为潜在温度低于-0.7摄氏度的水）在向东流动的北部韦德涡流中的CFC浓度比向西流动的南部肢体高约5至6倍。我们的CFC测量结果表明，在Weddell西部西部存在Weddell海底水的不同来源，与先前基于潜在温度和盐度信号的描述一致。在北部的韦德尔流域，韦德尔海深水中的氟氯化碳浓度很高，潜在温度在0摄氏度至-0.7摄氏度之间，这证实了韦德尔海西部和西南部这种水团的长期公认来源。在南纬约20度的Weddell Gyre南部和南极大陆斜坡上，潜在温度为-0.45°C的Weddell海深水在海底上方约1000 m处显示出最大的CFC深度。南极深部核心区的CFC浓度约为北纬30度的Weddell Gyre北部新Weddell Sea Deep Water的80％。A23CFC和水文学数据与Weddell Sea Deep Waters源自于相反，这些示踪剂表明，在韦德吉尔南部的韦德海深水的重要部分起源于韦德西部西部，可能靠近埃默里盆地和周围环境（东经75度）。这些特征在处理通量的模拟中，应仔细考虑深韦德涡流的循环和更新情况;路径和南极底水形成速率。 [参考：46]

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