Cosmogenic nuclide evidence for enhanced sensitivity of an East Antarctic ice stream to change during the last deglaciation
Cosmogenic nuclide evidence for enhanced sensitivity of an East Antarctic ice stream to change during the last deglaciation
复制标题
宇宙成因核素证据表明东南极冰流在上次冰消期期间变化的敏感性增强
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
D. Gore
中科院分区：
文献类型：
--
作者：
D. White;D. Fink;D. Gore
南极洲东部查尔斯王子山脉的冰川沉积物记录了世界上最大的冰沟之一的兰伯特冰川-埃默里冰架系统中晚更新世冰厚度的变化。一个前冰川的限制，划分的最低限度风化的存款，遵循一个凹的纵向剖面，表明一个区域的强冰流通过最北端的兰伯特地堑500公里。在原位10 Be和26铝暴露年龄从这些相对未风化的存款表明，最近阶段的冰下降发生在约。18和8 ka，之前多达6 k. y。邻近沿海地区的冰川消退。在一个强冰流地区，冰川消退的早期开始表明，南极东部冰盖对末次冰盛期后气候和海平面变化的敏感性比以前认识到的要高。
Glacial sediments from the Prince Charles Mountains, East Antarctica, record late Pleistocene ice thickness variability in the Lambert Glacier–Amery Ice Shelf system, one of the world9s largest ice drainages. A former glacial limit, demarcated by minimally weathered deposits, follows a concave longitudinal profile, indicating a zone of strong ice streaming through the northernmost 500 km of the Lambert Graben. In situ 10 Be and 26 Al exposure ages from these relatively unweathered deposits indicate that the most recent phase of ice lowering occurred between ca. 18 and 8 ka, preceding by as many as 6 k.y. the deglaciation of adjacent coastal regions. Earlier onset of deglaciation in an area of strong ice streaming suggests a heightened sensitivity of the East Antarctic Ice Sheet to climate and sea-level changes following the Last Glacial Maximum than previously recognized.