DOI: 10.1029/2018JC013833
Scopus记录号: 2-s2.0-85046093016
论文题名: Calibrated Seismic Imaging of Eddy-Dominated Warm-Water Transport Across the Bellingshausen Sea, Southern Ocean
作者: Gunn K.L. ; White N.J. ; Larter R.D. ; Caulfield C.P.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 4 起始页码: 3072
结束页码: 3099
语种: 英语
英文关键词: Antarctic Slope Front
; Bellingshausen Sea
; ice-shelf basal melt
; seismic oceanography
; warm-core eddies
英文摘要: Seismic reflection images of thermohaline circulation from the Bellingshausen Sea, adjacent to the West Antarctica Peninsula, were acquired during February 2015. This survey shows that bright reflectivity occurs throughout the upper 300 m. By calibrating these seismic images with coeval hydrographic measurements, intrusion of warm water features onto the continental shelf at Marguerite and Belgica Troughs is identified and characterized. These features have distinctive lens-shaped patterns of reflectivity with lengths of 0.75–11.00 km and thicknesses of 100–150 m, suggesting that they are small mesoscale to submesoscale eddies. Abundant eddies are observed along a transect that crosses Belgica Trough. Near Alexander Island Drift, a large, of order (O)102 km3, bowl-like feature, that may represent an anticyclonic Taylor column, is imaged on a pair of orthogonal images. A modified iterative procedure is used to convert seismic imagery into maps of temperature that enable the number and size of eddies being transported onto the shelf to be quantified. Finally, analysis of prestack shot records suggests that these eddies are advecting southward at speeds of O(0.1) m s−1, consistent with limited legacy hydrographic measurements. Concentration of observed eddies south of the Southern Antarctic Circumpolar Current Front implies they represent both a dominant, and a long-lived, mechanism of warm-water transport, especially across Belgica Trough. Our observations suggest that previous estimates of eddy frequency may have been underestimated by up to 1 order of magnitude, which has significant implications for calculations of ice mass loss on the shelf of the West Antarctic Peninsula. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114128
Appears in Collections: 气候减缓与适应
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作者单位: Bullard Laboratories, Department of Earth Sciences, Madingley Rise, University of Cambridge, Cambridge, United Kingdom; British Antarctic Survey, High Cross, Cambridge, United Kingdom; BP Institute and Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, United Kingdom
Recommended Citation:
Gunn K.L.,White N.J.,Larter R.D.,et al. Calibrated Seismic Imaging of Eddy-Dominated Warm-Water Transport Across the Bellingshausen Sea, Southern Ocean[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(4)