The warming of the Chukchi slope through the Barrow Canyon outflow in the 2016‐2017 winter
The warming of the Chukchi slope through the Barrow Canyon outflow in the 2016‐2017 winter
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2016-2017 年冬季楚科奇斜坡通过巴罗峡谷流出的变暖
DOI：
10.1029/2019jc015093
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
and N. Harada
中科院分区：
文献类型：
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作者：
Kimura;S.;J. Onodera;M. Itoh;T. Kikuchi;S. Nishino;Y. Kawaguchi;E. Watanabe;and N. Harada
楚科奇浅海是通往北冰洋的门户，这里的水来自太平洋。虽然大部分源自太平洋的水流经楚科奇海东北角的巴罗峡谷，但人们对其周围地区冬季的水文情况知之甚少。本文介绍了从自主剖面仪和巴罗峡谷系泊记录中获得的楚科奇斜坡冬季水文剖面。2016年12月至2017年2月，巴罗峡谷中部和西部地区异常温暖（比气候学温度高~ 0.5℃），气流流向北冰洋。与夏季地表附近的变暖不同，温暖流出的温度最高可达80 dbar，这种流出改变了峡谷以北70公里楚科奇斜坡上的水团性质。根据我们从2002年开始的巴罗峡谷系泊记录，这是第一次在冬季流出量上记录到这种变暖。我们认为这是由于巴罗峡谷流出的有利风型和冬季前楚科奇海南部（阿拉斯加湾和白令海）变暖的共同作用。
The shallow Chukchi Sea is a gateway to the Arctic Ocean for Pacific‐origin waters. While a substantial portion of the Pacific‐origin waters flows through Barrow Canyon in the northeast corner of the Chukchi Sea, little is known on the hydrography of the surrounding regions in winter. We present profiles of wintertime hydrography on the Chukchi slope from an autonomous profiling instrument and mooring records in Barrow Canyon. The central and western sectors of Barrow Canyon in December 2016 to February 2017 were anomalously warm (∼0.5 °C warmer than the climatology) with the flow orienting toward the Arctic Ocean. Unlike the summertime warming near the surface, the warm outflow has a temperature maximum at 80 dbar, and this outflow modifies the water mass properties on the Chukchi slope 70 km north of the canyon. Based on our Barrow Canyon mooring records starting in 2002, this is the first time that such warming is recorded on the outflow in winter. We discuss that this is due to the combination of the Barrow Canyon outflow favorable wind pattern and warming in the southern Chukchi Sea (the Gulf of Alaska and the Bering Sea) before the winter.