Summertime circulation in the eastern Chukchi Sea
Summertime circulation in the eastern Chukchi Sea
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DOI：
10.1016/j.dsr2.2015.02.006
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发表时间：
2015-08-01
影响因子：
3
通讯作者：
Pickart, Robert S.
中科院分区：
文献类型：
--
作者：
Gong, Donglai;Pickart, Robert S.
太平洋起源的水在夏季穿越楚科奇海东部的运输进行了研究，使用船载水文和声学多普勒海流剖面仪数据从多个调查。该研究确定了该地区的两条主要运输途径。著名的阿拉斯加沿岸流（ACC）沿阿拉斯加海岸沿着向极地流动，而最近发现的较慢的水流则通过先驱和汉纳浅滩之间的中央海峡向北流动。这两股水流分开过去的希望点，并似乎再次合并在巴罗峡谷通过以前未解决的途径流动西向东跨越楚科奇海。将太平洋海水从白令海峡输送到巴罗峡谷的集合流称为白令-巴罗海流系统（BBCS）。BBCS的沿海分支，包括ACC，是一个弱斜压流的最大速度超过80厘米/秒的巴罗峡谷内。BBCS的中央通道分支相当弱，最大流速低于20 cm/s。流向西部先驱峡谷的一部分太平洋水也可能对BBCS有贡献，但数量在我们数据的误差范围内。不同分支的平流时间尺度的差异允许不同季节特性的水团同时被BBCS输送。夏季楚科奇海南部和中部大部分海域为夏季水团，冬季楚科奇海北方的汉纳浅滩和陆架区为夏季水团。夏季总BBCS体积运输在楚科奇海东部的四个不同的位置进行了测量，并发现大致一致。总体平均输送量为0.86 Sv，而夏季白令海峡输送量为1.08 Sv。这一研究表明，BBCS是输送太平洋水团进入北极海盆西部的主要通道。(C)2015爱思唯尔有限公司版权所有。
The transport of Pacific-origin water across the eastern Chukchi Sea during summer is studied using shipboard hydrographic and Acoustic Doppler Current Profiler data from multiple surveys. The study identifies two major transport pathways in this region. The well-known Alaskan Coastal Current (ACC) flows poleward along the Alaska coast, while a more recently discovered and slower current flows northward through the Central Channel between Herald and Hanna Shoals. The two currents separate past Point Hope and appear to merge again in Barrow Canyon via previously unresolved pathways flowing west to east across the Chukchi Sea. The collective flow that transports Pacific water from Bering Strait to Barrow Canyon is termed the Bering to Barrow Current System (BBCS). The coastal branch of the BBCS, which encompasses the ACC, is a weakly baroclinic flow with a maximum speed in excess of 80 cm/s inside Barrow Canyon. The Central Channel branch of the BBCS is considerably weaker, with a maximum flow speed under 20 cm/s. A portion of the Pacific water that flows towards Herald Canyon to the west may also contribute to the BBCS, the amount, but the amount is within the margin of error of our data. The difference in the advective time scales of the various branches allows water masses of different seasonal characteristics to be transported simultaneously by the BBCS. Summer water masses occupy most of the southern and central Chukchi Sea while winter water masses occupy Hanna Shoal and shelfbreak regions in the northern Chukchi Sea during summer. The total BBCS volume transport in summer is measured at four different locations in the eastern Chukchi Sea and found to be generally consistent. The overall mean transport is 0.86 Sv, compared to the summer Bering Strait transport of 1.08 Sv. This study suggests that the BBCS is the main transport pathway delivering Pacific water masses into the western Arctic Basin. (C) 2015 Elsevier Ltd. All rights reserved.