Collaborative Research: A Southern Hemispheric Perspective on Holocene Climate Variability Based on Mountain Glacial Chronologies

合作研究：基于山地冰川年代学的全新世气候变化的南半球视角

• 批准号: 0902739
• 负责人: Robert Finkel
• 金额: $ 7.6万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902739&HistoricalAwards=false
• 关键词: Collaborative; Research; Southern; Hemispheric; Perspective

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). The group will test hypotheses concerning how temporal and spatial variability of Southern Hemisphere climate compared with the Northern Hemisphere during the Holocene. This research will help resolve drivers of paleoclimate by providing a perspective on Southern Hemisphere climate changes. Using recent analytic advances, the group uses 10Be measurements to directly date mid- to late Holocene moraines. These ages provide a new perspective, especially when combined with other proxy records, on Southern terrestrial-atmosphere climate variability. The focus is on the history of land ice-cover in the southern Andes, where the cryosphere is particularly sensitive to changes in atmospheric temperature and precipitation. This new chronology illustrates changes in land ice in Patagonia and the Southern Hemisphere during the mid- to late Holocene and the context for 20th/21st century changes. Patagonia is in a key area of the globe to provide insight into past changes in atmospheric climate variability. It is the only major landmass between ~46°S and Antarctica in an area affected by both polar and middle latitude climate regimes. Modern human civilization has developed against the backdrop of Holocene climate variability, and one of the most important goals in paleoclimatology has been to understand the causes of this variability. As pointed out by the IPCC, knowledge of Southern Hemisphere climate, especially over the last 2000 years, is 'severely limited' by the lack of dated paleoclimate records. The proposed research helps transform our understanding of Southern Hemisphere paleoclimate by using a new approach to date Late Holocene moraines. This technique allows study of sequences that have been difficult to date because of a lack of organic matter. This project also improves our understanding of 20th/21st century changes in glaciers, which may be different between the hemispheres. The project coordinates expertise in glacial geology and geochronology and collaboration between experts in glacier-climate modeling and paleoecology. Broader impacts include strengthening the relations between universities in the U.S., UK, Chile, Argentina, and New Zealand. The international collaborations involve several scientists relatively close to the start of their careers. The PIs are all actively engaged in education and outreach, which involves the glacial history of one of the busiest national parks in the world. The results will be avilable in open datasets, and on displays in the parks.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。该小组将检验有关在全新世期间与北半球相比，南半球气候的暂时性和空间变异性的假设。这项研究将通过提供有关南半球气候变化的观点来帮助解决古气候的驱动因素。利用最近的分析进步，该小组使用10BE测量值直接约会全新世羊膜中期。这些年龄提供了一种新的视角，尤其是与其他代理记录相结合的南部大气气候变化时。重点是安第斯山脉南部的陆冰覆盖史，那里的冰冻圈对大气温度和降水的变化特别敏感。该新的年表插图在全新世晚期至晚期的巴塔哥尼亚和南半球的陆地冰上发生了变化，以及20/21世纪的背景变化。巴塔哥尼亚正处于全球关键领域，以洞悉大气气候变化的过去变化。它是受极性和中纬度气候状态影响的区域中唯一的〜46°S和南极洲之间的唯一主要陆地。现代人类文明在全新世气候变异性的背景下发展了，古气候学中最重要的目标之一是我们了解这种变异性的原因。正如IPCC指出的那样，由于缺乏过时的古气候记录，对南半球气候的知识，尤其是在过去的2000年中，受到了“限制”。拟议的研究有助于通过使用一种新近全新世的新方法来改变我们对南半球古气候的理解。该技术允许研究由于缺乏有机物而难以约会的序列。该项目还提高了我们对冰川20/21世纪变化的理解，这可能会在半球之间有所不同。该项目协调冰川地质和地质学专业知识以及冰川气候建模和古生态学专家之间的合作。更广泛的影响包括加强美国，英国，智利，阿根廷和新西兰之间的关系。国际合作涉及几位科学家相对接近职业生涯的开始。 PI都积极从事教育和外展活动，其中涉及世界上最繁忙的国家公园之一的冰川历史。结果将在开放数据集和公园中的显示器中可用。