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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/F012942/1
负责人：
Neil Glasser
金额：
$ 44.93万
依托单位：
Aberystwyth University
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%2FF012942%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的淡水。向海洋释放淡水不仅会提高海平面，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——南极大陆上，巨大的冰架将冰川与海洋隔开。当冰川到达海平面时，这些冰架就会形成漂浮的或接地的冰架。最近媒体对20世纪南极冰架崩塌的报道使全世界的注意力集中在这个话题上，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，现在正变得无法使用。在这种背景下，我们必须了解南极冰川和冰架在过去、现在和未来的行为。因此，该项目的目的是重建第四纪（过去200万年）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，包括从卫星图像和实地绘制冰川和相关地貌；收集冰碛岩样品，用宇宙成因同位素定年；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核心研究进行比较。获得南极半岛冰盖生长和衰退期的时间，将使我们能够重建这一冰块以前的波动，从而对其未来可能的行为作出预测。我们也将能够得出关于南极冰盖周围的冰架在过去是否坍塌的结论。