Abstract

Results of a mesoscale survey in the Powell Basin in the northern part of the Weddell Sea are analyzed. The survey included 24 CTD casts (6 × 4) with an interval of six nautical miles. Measurements of water transparency, fluorescence, and plankton catches using the Bongo and Jedy nets were performed. The survey covered a region of an oceanographic front. The front is manifested by sharp horizontal gradients of temperature and chemical properties. The front exists due to the differences in the water properties typical for the entire Weddell Sea and water from the western part of the sea, which is formed in a shallow region covered with ice and icebergs that prevent warming of the upper layer of water by the solar irradiance. The front in the region of the mesoscale survey appears due to the separation of meanders from the large-scale front in the northern part of the Weddell Sea and displacement of the ring with cold water from the bottom elevation to the region of the survey. The differences in the water structures north and south of the front are also pronounced in chemical properties, optical characteristics of the upper layer, and different concentrations and species of phytoplankton, zooplankton, and pelagic fish.

中文翻译：

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韦德海北部海洋的中尺度变率

摘要

分析了韦德尔海北部鲍威尔盆地的中尺度调查结果。该调查包括间隔6海里的24个CTD石膏（6×4）。使用Bongo和Jedy网对水的透明度，荧光和浮游生物捕获物进行了测量。该调查覆盖了海洋学前沿的一个区域。温度和化学性质在水平方向上呈尖锐的倾斜，显示出锋线。由于整个韦德尔海的典型水质和海域西部的水的差异，前缘存在，该水域形成在一个覆盖着冰和冰山的浅水区中，以防止冰层使上层水变暖。太阳辐照度。中尺度调查区域的前缘出现是由于蜿蜒与韦德海北部的大型前缘分离，以及环圈被冷水从底部海拔向调查区域位移所致。锋面北部和南部的水结构差异在化学性质，上层光学特征以及浮游植物，浮游动物和远洋鱼类的不同浓度和种类方面也很明显。