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Circulation of the Chukchi Sea shelfbreak and slope from moored timeseries
Li, Min2,3; Pickart, Robert S.; Spall, Michael A.; Weingartner, Thomas J.; Lin, Peigen1; Moore, G. W. K.; Qi, Yiquan6
AbstractData 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.
KeywordCirculation Chukchi Sea Boundary currents Arctic Shelfbreak upwelling
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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.Weingartner, Thomas J.] Univ Alaska, Inst Marine Sci, Fairbanks, AK 99775 USA
6.Moore, G. W. K.] Univ Toronto, Dept Phys, Toronto, ON, Canada
7.Hohai Univ, Coll Oceanog, Nanjing 210098, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, Min,Pickart, Robert S.,Spall, Michael A.,et al. Circulation of the Chukchi Sea shelfbreak and slope from moored timeseries[J]. PROGRESS IN OCEANOGRAPHY,2019,172:14, 33.
APA Li, Min.,Pickart, Robert S..,Spall, Michael A..,Weingartner, Thomas J..,Lin, Peigen.,...&Qi, Yiquan.(2019).Circulation of the Chukchi Sea shelfbreak and slope from moored timeseries.PROGRESS IN OCEANOGRAPHY,172,14.
MLA Li, Min,et al."Circulation of the Chukchi Sea shelfbreak and slope from moored timeseries".PROGRESS IN OCEANOGRAPHY 172(2019):14.
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