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Glacial history of the NE Antarctic Peninsula region over centennial to millennial timescales

南极半岛东北部地区百年至千年时间尺度的冰川历史

基本信息

批准号：
NE/F012896/1
负责人：
Jonathan Carrivick
金额：
$ 4.48万
依托单位：
University of Leeds
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FF012896%2F1
关键词：
Glacial history NE Antarctic Peninsula

项目摘要

When glaciers and ice sheets melt, they release large volumes of fresh water into the oceans. The release of fresh water into the oceans not only raises sea level but also influences deep sea circulation and therefore regional climate. On the Antarctic continent, the largest freshwater store on the planet, glaciers are bufferered from the oceans by large ice shelves. These ice shelves form when glaciers reach sea level and spread out to form a floating or grounded shelf. Recent media coverage of Twentieth Century Antarctic ice shelf collapse has focused the world's attention on this topic and it has been suggested that many ice shelves, particularly around the Antarctic Peninsula, are now becoming unsable as a resut of global temperature rise. Against this background, it is important that we understand the behaviour of Antarctic glaciers and ice shelves in the past, present and future. The aim of this project is therefore to reconstruct the outline and evolution of the Antarctic Peninsula Ice Sheet through the Quaternary Period (the last two million years). We will do this using a variety of different methods including mapping of glaciers and associated landforms from satellite imagery and in the field; collecting samples of rock from glacial moraines for dating with cosmogenic isotope dating; and comparing our evidence on land to previous studies from offshore cores that record past fluctuations of the Antarctic Peninsula Ice Sheet. Obtaining dates for the timing of periods of growth and decay of the Antarctic Peninsula Ice Sheet will enable us to reconstruct the former fluctuations of this ice mass and therefore to make predictions about its possibe future behaviour. We will also be in a position to draw conclusions about whether or not the ice shelves surrounding the Antarctic Ice Sheet have collapsed in the past.

当冰川和冰盖融化时，它们会向海洋释放大量淡水。淡水释放到海洋不仅会升高海平面，还会影响深海环流，从而影响区域气候。在地球上最大的淡水储藏地南极大陆，巨大的冰架将冰川与海洋隔离开来。当冰川达到海平面并展开形成浮动或接地的冰架时，这些冰架就形成了。最近媒体对二十世纪南极冰架崩塌的报道引起了世界对这个话题的关注，有人认为，由于全球气温上升，许多冰架，特别是南极半岛周围的冰架现在变得不稳定。在此背景下，了解南极冰川和冰架过去、现在和未来的行为非常重要。因此，该项目的目的是重建第四纪（过去两百万年）南极半岛冰盖的轮廓和演变。我们将使用各种不同的方法来做到这一点，包括通过卫星图像和实地绘制冰川和相关地貌图；从冰川冰碛中收集岩石样本，用于宇宙成因同位素测年；并将我们在陆地上的证据与之前记录南极半岛冰盖过去波动的近海岩芯研究进行比较。获得南极半岛冰盖生长和衰退时期的日期将使我们能够重建该冰块以前的波动，从而预测其未来可能的行为。我们还将能够得出关于南极冰盖周围的冰架过去是否崩塌的结论。