DOI: 10.5194/tc-11-1141-2017
Scopus记录号: 2-s2.0-85018873859
论文题名: Could promontories have restricted sea-glacier penetration into marine embayments during Snowball Earth events?
作者: Campbell A ; J ; , Massarano B ; , Waddington E ; D ; , Warren S ; G
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 3 起始页码: 1141
结束页码: 1148
语种: 英语
英文关键词: alga
; bay
; climate conditions
; Earth
; eukaryote
; extreme event
; glacier dynamics
; ice flow
; marine environment
; paleoceanography
; paleoecology
; Proterozoic
; range expansion
; refugium
; sea ice
; survival
; algae
; Eukaryota
英文摘要: During the Neoproterozoic (∼1000-550 Ma), Earth experienced several climate excursions of extreme cold, often referred to as the Snowball Earth events. During these periods, thick flowing ice, referred to as sea glaciers, covered the entire planet's oceans. In addition, there is evidence that photosynthetic eukaryotic algae survived during these periods. With thick sea glaciers covering the oceans, it is uncertain where these organisms survived. One hypothesis is that these algae survived in marine embayments hydrologically connected to the global ocean, where the flow of sea glacier could be resisted. In order for an embayment to act as a refugium, the invading sea glacier must not completely penetrate the embayment. Recent studies have shown that straight-sided marine embayments could have prevented full sea-glacier penetration under a narrow range of climate conditions suitable for the Snowball Earth events. Here we test whether promontories, i.e., headlands emerging from a side shoreline, could further restrict sea-glacier flow. We use an ice-flow model, suitable for floating ice, to determine the flow of an invading sea glacier. We show that promontories can expand the range of climate conditions allowing refugia by resisting the flow of invading sea glaciers. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75557
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Astrobiology Program, University of Washington, Seattle, WA, United States; School of Surveying, University of Otago, Dunedin, New Zealand; Pacific Science Center, Seattle, WA, United States
Recommended Citation:
Campbell A,J,, Massarano B,et al. Could promontories have restricted sea-glacier penetration into marine embayments during Snowball Earth events?[J]. Cryosphere,2017-01-01,11(3)