首页    期刊浏览 2025年06月10日 星期二
登录注册

文章基本信息

  • 标题:Could promontories have restricted sea-glacier penetration into marine embayments during Snowball Earth events?
  • 本地全文:下载
  • 作者:Adam J. Campbell ; Betzalel Massarano ; Edwin D. Waddington
  • 期刊名称:The Cryosphere
  • 印刷版ISSN:1994-0416
  • 电子版ISSN:1994-0424
  • 出版年度:2017
  • 卷号:11
  • 期号:3
  • 页码:1141-1148
  • DOI:10.5194/tc-11-1141-2017
  • 出版社:Copernicus Publications
  • 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.
国家哲学社会科学文献中心版权所有