DOI: 10.5194/tc-14-3611-2020
论文题名: Sea ice drift and arch evolution in the Robeson Channel using the daily coverage of Sentinel-1 SAR data for the 2016-2017 freezing season
作者: Shokr M.E. ; Wang Z. ; Liu T.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 11 起始页码: 3611
结束页码: 3627
语种: 英语
英文关键词: ice cover
; ice drift
; satellite data
; satellite imagery
; sea ice
; seawater
; spatiotemporal analysis
; synthetic aperture radar
; tracking
; Arctic
; Baffin Bay
; Canada
; Ellesmere Island
; Greenland
; Nunavut
; Queen Elizabeth Islands
; Robeson Channel
; Satellites
英文摘要: The Robeson Channel is a narrow sea water passage between Greenland and Ellesmere Island in the Arctic. It is a pathway of sea ice from the central Arctic and out to Baffin Bay. In this study, we used a set of daily synthetic aperture radar (SAR) images from the Sentinel-1A/1B satellites, acquired between September 2016 and April 2017, to study the kinematics of individual ice floes as they approach and then drift through the Robeson Channel. The tracking of 39 selected ice floes was visually performed in the image sequence, and their speed was calculated and linked to the reanalysis 10 m wind from ERA5. The results show that the drift of ice floes is very slow in the compact ice regime upstream of the Robeson Channel, unless the ice floe is surrounded by water or thin ice. In this case, the wind has more influence on the drift. On the other hand, the ice floe drift is found to be about 4-5 times faster in the open-drift regime within the Robeson Channel and is clearly influenced by wind. A linear trend is found between the change in wind and the change in ice drift speed components, along the length of the channel. Case studies are presented to reveal the role of wind in ice floe drift. This paper also addresses the development of the ice arch at the entry of the Robeson Channel, which started development on 24 January and matured on 1 February 2017. Details of the development, obtained using the sequential SAR images, are presented. It is found that the arch's shape continued to adjust by rupturing ice pieces at the locations of cracks under the influence of the southward wind (and hence the contour kept displacing northward). The findings of this study highlight the advantage of using the high-resolution daily SAR coverage in monitoring aspects of sea ice cover in narrow water passages where the ice cover is highly dynamic. The information will be particularly interesting for the possible applications of SAR constellation systems. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164587
Appears in Collections: 气候变化与战略
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作者单位: Meteorological Research Division, Environment and Climate Change Canada, Toronto, ON M3H-5T4, Canada; Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan, 430079, China
Recommended Citation:
Shokr M.E.,Wang Z.,Liu T.. Sea ice drift and arch evolution in the Robeson Channel using the daily coverage of Sentinel-1 SAR data for the 2016-2017 freezing season[J]. Cryosphere,2020-01-01,14(11)