Global S&T Development Trend Analysis Platform of Resources and Environment
项目编号 | 1552230 |
Cosmogenic surface exposure dating of Cordilleran-Laurentide ice-sheet separation during the last deglaciation: implications for abrupt sea-level rise | |
Anders Carlson | |
主持机构 | Oregon State University |
项目开始年 | 2016 |
2016-02-15 | |
项目结束日期 | 2018-01-31 |
资助机构 | US-NSF |
项目类别 | Standard Grant |
项目经费 | 249931(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | The rise in sea level during the last deglaciation (21,000-6,000 years ago) was punctuated by intervals of abrupt sea-level rise, called meltwater pulses (MWP), which indicate the development of instability in one or more of Earth's ice sheets. The largest MWP, MWP-1A, occurred 14,600-14,300 years ago with ~14 m of global-mean sea-level rise. It was recently hypothesized that the collapse of an ice saddle between the Cordilleran (CIS) and Laurentide (LIS) ice sheets could have caused MWP-1A when the two ice sheets separated. Results from this research will provide important data on whether the ice sheet failure caused rapid jumps in sea level. Determining if the ice sheet separation caused a MWP will provide insight into the evolution of North Atlantic climate and its relationship to meltwater discharge to the Arctic Ocean where much of the ice sheet separation meltwater would be routed. These findings will also have implications for development of instability in the Greenland ice sheet as it has an ice saddle similar to the one previously seen in the Cordilleran-Laurentide. Finally, these results will date when an ice-free corridor formed between the Cordilleran and Laurentide ice sheets, which has important ramifications for human migration routes to the Americas. This project will date the end of CIS-LIS separation with 50 boulder cosmogenic surface exposure ages at six locations along the suture zone of the ice sheets between 50°N and 60°N. These ages will determine when CIS-LIS separation was complete, and if it was concurrent with MWP-1A or another interval of rapid sea-level rise. They will also document if CIS-LIS separation occur over centuries, which could cause a MWP, or over millennia which would be inconsistent with separation causing a MWP. |
来源学科分类 | Geosciences - Earth Sciences |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/69139 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Anders Carlson.Cosmogenic surface exposure dating of Cordilleran-Laurentide ice-sheet separation during the last deglaciation: implications for abrupt sea-level rise.2016. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Anders Carlson]的文章 |
百度学术 |
百度学术中相似的文章 |
[Anders Carlson]的文章 |
必应学术 |
必应学术中相似的文章 |
[Anders Carlson]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论