Over the past few decades, the areal extent of the Arctic sea ice cover has decreased. During the winter of 2017, negative sea ice concentration anomalies occurred mainly in the Chukchi Sea and adjacent seas. The properties of Pacific water through the Bering Strait have changed in recent years. To highlight the role of the Pacific inflow during the 2017 Arctic sea ice retreat, we used mooring measurements and conductivity–temperature–depth (CTD) data to quantify the effect of inflow on sea ice in the Chukchi shelf. In September 2017, the temperature of the Pacific inflow was relatively high compared with the multi-year average, especially in the shelf north of 69°N where the temperature anomaly was generally greater than 1°C. The average heat content of each CTD station in September 2017 ranged from 0.77 to 1.58 GJ m−2, where each station was 0.25 GJ m−2 higher than the multi-year average. In the central shelf of the Chukchi Sea, the temperature of the 25–40 m layer increased after late May, and decreased after mid-September. The Pacific inflow could have provided a large amount of heat to the Chukchi shelf, the accumulated convective heat transported to the surface from September to October was approximately 1.68 × 10^18 J and it impacted the sea ice growth conditions.

中文翻译：

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西北冰洋楚科奇海因太平洋热提供的海洋热量导致2017年冬季海冰减少

在过去的几十年中，北极海冰覆盖的面积有所减少。在2017年冬季，负海冰浓度异常主要发生在楚科奇海及邻近海域。近年来，穿过白令海峡的太平洋水的性质发生了变化。为了强调太平洋流入量在2017年北极海冰撤退中的作用，我们使用了系泊测量和电导率-温度-深度（CTD）数据来量化流入量对楚科奇陆架上海冰的影响。2017年9月，太平洋流入的温度与多年平均水平相比相对较高，特别是在69°N以北的大陆架，那里温度异常通常大于1°C。2017年9月，每个CTD站的平均热量含量为0.77至1.58 GJ m-2，其中每个站为0。比多年平均值高25 GJ m-2。在楚科奇海中部大陆架，25-40 m层的温度在5月下旬之后升高，而在9月中旬之后降低。太平洋的流入可能为楚科奇陆架提供了大量的热量，从9月到10月，输送到地表的累积对流热量约为1.68×10 ^ 18 J，它影响了海冰的生长条件。