文献类型：期刊文献

英文题名：Circulation of the Chukchi Sea shelfbreak and slope from moored timeseries

作者：Li, Min[1,2,3,4];Pickart, Robert S.[2];Spall, Michael A.[2];Weingartner, Thomas J.[5];Lin, Peigen[2];Moore, G. W. K.[6];Qi, Yiquan[7]

机构：[1]Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China;[2]Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA;[3]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Guangdong, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[5]Univ Alaska, Inst Marine Sci, Fairbanks, AK 99775 USA;[6]Univ Toronto, Dept Phys, Toronto, ON, Canada;[7]Hohai Univ, Coll Oceanog, Nanjing 210098, Jiangsu, Peoples R China

年份：2019

卷号：172

起止页码：14

外文期刊名：PROGRESS IN OCEANOGRAPHY

收录：SCI-EXPANDED(收录号：WOS:000460493500002)、、EI(收录号：20190406411682)、Scopus(收录号：2-s2.0-85060236296)、WOS

基金：The authors wish to thank the crews of the USCGC Healy and the Norseman II for the deployment and recovery of the Chukchi slope mooring array. Jacob Cass and Peter Winsor were especially helpful in these efforts. Frank Bahr and Daniel Torres processed the mooring data. Funding for the fieldwork and analysis was provided by the Bureau of Ocean and Energy Management under contract M12AC00008 (ML, RP, TW), by the National Science Foundation under grants ARC-0856244 and PLR-1504333 (RP, PL), and OCE-1533170 and PLR-1415489 (MAS); ML also received support from the National Natural Science Foundation of China (Grants 41506018, 41876005, 41676008), the National Key Research and Development Program of China under contract No. 2016YFC14011403, and the GASI Project under contract No. GASI-IPOVAI-04; GWKM was supported by the Natural Sciences and Engineering Research Council of Canada.

语种：英文

外文关键词：Circulation; Chukchi Sea; Boundary currents; Arctic; Shelfbreak upwelling

外文摘要：Data from a year-long mooring array across the shelfbreak/upper-slope of the Chukchi Sea are used to describe and quantify the circulation and water masses of the region. The timeseries revealed the year-round existence of the eastward-flowing shelfbreak jet and, seaward of this, the westward-flowing Chukchi Slope Current. In the mean the slope current is estimated to transport 0.57 +/- 0.04 Sv of Pacific water, while the bottom-intensified shelfbreak jet transports 0.009 +/- 0.003 Sv towards Barrow Canyon. The slope current is surface-intensified in summer and fall, and in winter and spring it becomes middepth-intensified, moves shoreward, and weakens. Two extreme states of the circulation were identified: (1) an enhanced slope current and reversed (westward flowing) shelfbreak jet; and (2) a strong eastward-flowing shelfbreak jet and weak slope current. The former state occurs when the wind stress curl on the Chukchi shelf is positive, and the latter state occurs when the curl is negative. A simple theoretical model is used to determine the changes in sea surface height due to such wind stress curl forcing, which is consistent with the observed changes in flow seaward of the shelf both in amplitude and phase via geostrophic set up. Shelfbreak upwelling occurred throughout the year, but there was no correlation between the regional wind conditions and the upwelling. Furthermore, there was no apparent relationship between upwelling and the extreme slope current/shelfbreak jet events. A comparison of water mass signals between the Chukchi slope array and a mooring at the head of Barrow Canyon supports the notion that the slope current is fed by the outflow of Pacific water from the canyon.