Water properties, heat and volume fluxes of Pacific water in Barrow Canyon during summer 2010
Water properties, heat and volume fluxes of Pacific water in Barrow Canyon during summer 2010
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DOI：
10.1016/j.dsr.2015.04.004
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发表时间：
2015-08-01
影响因子：
2.4
通讯作者：
Nobre, Carolina
中科院分区：
文献类型：
--
作者：
Itoh, Motoyo;Pickart, Robert S.;Nobre, Carolina
在过去几十年中，北极海盆太平洋部分夏季海冰退缩的情况有所增加，部分原因可能是来自白令海峡的太平洋水夏季热通量增加。位于楚科奇海东北部的巴罗峡谷是太平洋水进入北极盆地的主要通道。本文介绍了2010年夏季横跨巴罗峡谷的6个重复高分辨率船上水文/速度剖面的结果。不同的太平洋水团喂养的峡谷-阿拉斯加沿岸水（ACW），夏季白令海水（BSW），和太平洋冬季水（PWW）-都表现出显着的季节内变化。通过峡谷的净体积输送量在0.96和1.70 Sv之间，包括0.41-0.98 Sv的暖太平洋水（ACW和BSW）和0.28-0.65 Sv的PWW。向极的热通量变化也很大，在8.56 TW到24.56 TW之间，主要是由于温暖的太平洋海水温度的变化。使用补充系泊数据从核心的温暖的水，沿着风数据从Pt。巴罗气象站，我们推导和评估代理估计热通量的峡谷的夏季时间段，这是当大部分的热量向北传递到盆地。2010年的平均热通量估计为3.34太瓦，与2007年的最大记录一样大。这些热量可以融化315，000公里（2）的1米厚的冰，这可能导致北冰洋太平洋部分的夏季海冰大幅退缩。(C)2015作者由爱思唯尔有限公司发布
Over the past few decades, sea ice retreat during summer has been enhanced in the Pacific sector of the Arctic basin, likely due in part to increasing summertime heat flux of Pacific-origin water from the Bering Strait. Barrow Canyon, in the northeast Chukchi Sea, is a major conduit through which the Pacific-origin water enters the Arctic basin. This paper presents results from 6 repeat high-resolution shipboard hydrographic/velocity sections occupied across Barrow Canyon in summer 2010. The different Pacific water masses feeding the canyon - Alaskan coastal water (ACW), summer Bering Sea water (BSW), and Pacific winter water (PWW) - all displayed significant intra-seasonal variability. Net volume transports through the canyon were between 0.96 and 1.70 Sv poleward, consisting of 0.41-0.98 Sv of warm Pacific water (ACW and BSW) and 0.28-0.65 Sv of PWW. The poleward heat flux also varied strongly, ranging from 8.56 TW to 24.56 TW, mainly due to the change in temperature of the warm Pacific water. Using supplemental mooring data from the core of the warm water, along with wind data from the Pt. Barrow weather station, we derive and assess a proxy for estimating heat flux in the canyon for the summer time period, which is when most of the heat passes northward towards the basin. The average heat flux for 2010 was estimated to be 3.34 TW, which is as large as the previous record maximum in 2007. This amount of heat could melt 315,000 km(2) of 1-meter thick ice, which likely contributed to significant summer sea ice retreat in the Pacific sector of the Arctic Ocean. (C) 2015 The Authors. Published by Elsevier Ltd.