Collaborative Research: Dunefield Records of Late Quaternary Climatic Change, Northern China

合作研究：中国北方晚第四纪气候变化的沙丘记录

• 批准号: 0502511
• 负责人: James Swinehart
• 金额: --
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-06-01 至 2009-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0502511&HistoricalAwards=false
• 关键词: Collaborative; Research; Dunefield; Records; Late

The objective of this project is to develop new records of late Quaternary climatic change. It is designed specifically to yield a composite record of dune activity and associated hydrologic change and dust production from the Last Glacial Maximum to the present, as well as indicating past changes in the East Asian monsoon circulation. These results will derive from stratigraphic and geomorphic evidence preserved in dune fields distributed across northern China. The work will be undertaken collaboratively by scientists in North America and China, and will promote training and learning through the involvement of graduate and undergraduate students in both laboratory and field work. Questions this research is designed to resolve are: a) the relative magnitude of change in the monsoon system at orbital and millennial timescales; b) the timing and abruptness of change at the orbital timescale and the degree to which they are reproduced by model experiments, and c) the synchroneity of millennial-scale climatic change across northern China, as well as on hemispheric and global scales. While the record at any given study site may be incomplete and open to multiple interpretations, a composite record from many different geomorphic settings is expected to provide relatively straightforward, potentially quantitative paleoclimatic information. This landscape-scale record will also be valuable in assessing the importance of land-surface feedbacks in the monsoon system.

该项目的目的是建立晚第四纪气候变化的新记录。它的设计目的是提供从末次盛冰期到现在的沙丘活动和相关水文变化和沙尘产生的综合记录，并表明东亚季风环流过去的变化。这些结果将来自于中国北部分布的沙丘地保存下来的地层和地貌证据。这项工作将由北美和中国的科学家合作进行，并将通过研究生和本科生参与实验室和实地工作来促进培训和学习。本研究旨在解决的问题是：a)季风系统在轨道和千年时间尺度上的相对变化幅度；b)在轨道时间尺度上变化的时代性和突发性，以及模式试验对这些变化的再现程度；c)中国北方地区以及半球和全球尺度上千年尺度气候变化的同步性。虽然在任何给定的研究地点的记录可能是不完整的，并且有多种解释，但来自许多不同地貌环境的综合记录有望提供相对直接的、潜在的定量古气候信息。这种景观尺度的记录对于评估陆地表面反馈在季风系统中的重要性也很有价值。