| DOI: | 10.5194/tc-14-2071-2020
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| 论文题名: | Measuring the location and width of the Antarctic grounding zone using CryoSat-2 |
| 作者: | Dawson G.J.; Bamber J.L.
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2020
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| 卷: | 14, 期:6 | | 起始页码: | 2071
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| 结束页码: | 2086
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| 语种: | 英语
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| 英文关键词: | CryoSat
; flexure
; glacier mass balance
; hydrostatics
; ice shelf
; ice thickness
; radar interferometry
; sea ice
; Sentinel
; snowmelt
; Amundsen Sea
; Antarctica
; Carlson Inlet
; East Antarctica
; Evans Ice Stream
; Queen Maud Land
; Ross Ice Shelf
; Southern Ocean
; West Antarctica
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| 英文摘要: | We present the results of mapping the limit of the tidal flexure (point F) and hydrostatic equilibrium (point H) of the grounding zone of Antarctic ice shelves from CryoSat- 2 standard and swath elevation data. Overall we were able to map 31% of the grounding zone of the Antarctic floating ice shelves and outlet glaciers.We obtain near-complete coverage of the Filchner-Ronne Ice Shelf. Here we manage to map areas of Support Force Glacier and the Doake Ice Rumples, which have previously only been mapped using breakin- slope methods. Over the Ross Ice Shelf, Dronning Maud Land and the Antarctic Peninsula, we obtained partial coverage, and we could not map a continuous grounding zone for the Amery Ice Shelf and the Amundsen Sea sector. Tidal amplitude and distance south (i.e. across-track spacing) are controlling factors in the quality of the coverage and performance of the approach. The location of the point F agrees well with previous observations that used differential satellite radar interferometry (DInSAR) and ICESat-1, with an average landward bias of 0.1 and 0.6 km and standard deviation of 1.1 and 1.5 km for DInSAR and ICESat measurements, respectively.We also compared the results directly with DIn- SAR interferograms from the Sentinel-1 satellites, acquired over the Evans Ice Stream and the Carlson Inlet (Ronne Ice Shelf), and found good agreement with the mapped points F and H. We also present the results of the spatial distribution of the grounding zone width (the distance between points F and H) and used a simple elastic beam model, along with ice thickness calculations, to calculate an effective Young modulus of ice of E D 1:4_0:9 GPa. © 2020 Copernicus GmbH. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/164438
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| Appears in Collections: | 气候变化与战略
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作者单位: | Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom
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| Recommended Citation: | |
Dawson G.J.,Bamber J.L.. Measuring the location and width of the Antarctic grounding zone using CryoSat-2[J]. Cryosphere,2020-01-01,14(6)
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