南极普里兹湾达恩利角固定冰附近局地高密陆架水的来源

本文采用固定冰数据集和南极象海豹获取的现场观测数据集，分析了南极达恩利角固定冰附近局地高密陆架水的变化。结果表明：首先，达恩利角固定冰存在显著季节变化，对于达恩利角冰间湖及局地高密陆架水的生成都具有重要影响。其次，达恩利角固定冰在2000−2014年期间年际变化很小，无显著增减趋势。第三，达恩利角固定冰附近局地高密陆架水有两个显著来源：（1）3−4月，达恩利角固定冰快速生成时伴随着强烈的盐析作用，进而局地生成高密陆架水；（2）5月，达恩利角固定冰达到最大范围，局地盐析作用减弱至很小，而上游在冰架水抑制作用减弱后，麦肯基湾冰间湖海域的高密陆架水生成增强，能够向西北输运至达恩利角固定冰附近。本研究初步证明达恩利角固定冰除了维持达恩利角冰间湖存在的作用外，对局地高密陆架水生成也可能有重要影响，同时指出一条重要的水团输运路径，这有助于提高对达恩利角附近冰−海相互作用的理解，对该地区开展更多观测或模拟研究是必要的。

Sources of local dense shelf water near the Cape Darnley fast ice in Prydz Bay,Antarctica

In this paper, we analyze the variation of local dense shelf water around the Cape Darnley fast ice by using a landfast ice dataset and in-situ observation data of Antarctic elephant seals. The results show that: firstly, there are significant seasonal variations of Cape Darnley fast ice, which has a vital impact on the formation of the Cape Darnley polynya and the local dense shelf water. Secondly, the interannual variation of Cape Darnley fast ice is minimal from 2000 to 2014, with no significant trend of increasing or decreasing. Thirdly, we identify two significant sources of local dense shelf water near the Cape Darnley fast ice area: (1) dense shelf water produced by the strong brine rejection process during the rapid generation of Cape Darnley fast ice from March to April; (2) Cape Darnley fast ice reaching its maximum extent and local brine rejection being reduced to a minimum in May. After the weakening of the inhibition of ice shelf water, the formation of dense shelf water in the upstream MacKenzie Bay polynya is enhanced and transported northwest to the vicinity of the Cape Darnley fast ice. In this study, we preliminarily demonstrates that, in addition to maintaining Cape Darnley polynya, Cape Darnley fast ice probably has an important influence on the generation of local dense shelf water, and points out an important water mass transport path. These would help improve the comprehension of ice-sea interaction near Cape Darnley and point out the need for more observations or modeling studies in this area.