Variations in the conditions of sea ice in the northern part of Baffin Bay and North Open Water polynya influence human activity in northwestern Greenland through oceanic circulation and heat balance between air and sea. To evaluate the impact of variations in sea ice conditions on the surrounding environment, it is important to understand the mechanism of sea ice variations over long periods. In this study, we estimated the age of the SIGMA‐A ice core collected northwestern Greenland Ice Sheet and researched the relationship between annual or seasonal deuterium excess (d‐excess) and seasonal sea ice concentration. We found that a temporal variation in the spring d‐excess in the ice core negatively correlated significantly with that of sea ice concentration in February–April in northern Baffin Bay from 1979–2005 (r = −0.61, p < 0.001). Using this relationship, we reconstructed the temporal variations in sea ice concentrations for 100 years from the ice core drilled in the northwestern Greenland Ice Sheet. The sea ice concentration in the early twentieth century was lower than that in the present. The decrease in sea ice concentration was consistent with analytical results for marine sediments obtained from Baffin Bay. We also suggested that the sea ice concentration was controlled by atmospheric conditions from the 1920s to 1940s based on examinations of correlations with the North Atlantic Oscillation index and air temperature in Ilulissat and by oceanographic conditions from 1945–1955, 1959–1969, and 1982–1992 based on the Atlantic Multidecadal Oscillation index and meridional heat transport to western Greenland.

中文翻译：

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利用西北格陵兰冰原沿岸冰芯中的氘过量来重建北巴芬湾海冰浓度

巴芬湾北部和北开放水域多年生鱼类的海冰状况变化通过海洋环流和海，海之间的热平衡影响格陵兰西北部的人类活动。为了评估海冰条件变化对周围环境的影响，重要的是了解长期内海冰变化的机制。在这项研究中，我们估算了格陵兰西北部西北部收集的SIGMA‐A冰芯的年龄，并研究了年度或季节性氘过量（d-excess）与季节性海冰浓度之间的关系。我们发现，1979-2005年北巴芬湾2月至4月，冰芯春季过剩的时间变化与2月至4月海冰浓度的变化呈显着负相关（r = -0.61，p  <0.001）。利用这种关系，我们从格陵兰西北部冰原上钻出的冰芯重建了100年海冰浓度的时间变化。二十世纪初期的海冰浓度低于目前的浓度。海冰浓度的下降与从巴芬湾获得的海洋沉积物的分析结果一致。我们还建议，根据对伊卢利萨特北大西洋涛动指数和气温的相关性以及1945年至1955年，1959年至1969年和1982年至1992年基于大西洋多年代际振荡指数和向西格陵兰的子午热传输。