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GRGC: Reconstruction of Water Balance Fluctuations During the Last Deglaciation Based on Glacial/Lacustrine Systems in the Western Great Basin

GRGC：基于西部大盆地冰川/湖泊系统重建末次冰消期水平衡波动

基本信息

批准号：
9417810
负责人：
Fred Phillips
金额：
$ 22.59万
依托单位：
New Mexico Institute of Mining and Technology
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-03-01 至 1999-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9417810&HistoricalAwards=false
关键词：
GRGC Reconstruction Water Balance Fluctuations

项目摘要

9417810 Phillips The end of the last glaciation was accomplished by a series of major and abrupt climatic events. It is clear that changes in the atmospheric transport of water vapor played a key role in the deglacial process. Although these events apparently resulted in a global secession of glacial conditions, the details of the sequence of events is poorly known outside the North Atlantic region. In this project we propose to apply new geochronological and paleohydrological methods to the interpretation of glacial and lacustrine data in a single, closed drainage basin: the paleo-Owens River system in the western Great Basin. We will apply mass spectrometric U/Th and cosmosgenic 36Cl dating to refining the existing chronology for lacustrine deposits and shorelines in the terminal basins. This chronology will be compared with one derived from cosmosgenic 36Cl and carbon-14 for glacial deposits and surfaces in the eastern Sierra Nevada, at the headwaters of the Owens River. These new and refined chronologies will allow the sequence of events for the glacial and lacustrine systems to be compared with each other. The combined sequence will then be quantitatively interpreted in terms of climatic driving forces, using a transient numerical energy and mass balance model. Finally, the reconstructed climatic history can be compared with recent ice core and marine sediment records of global conditions to assess how the global events were reflected by changes in temperature and water vapor transport in a continental setting.

9417810菲利普斯末次冰期的结束是由一系列重大而突然的气候事件完成的。很明显，大气中水汽输送的变化在冰消过程中起着关键作用。虽然这些事件显然导致了全球冰川条件的分离，但北大西洋地区以外的地区对事件序列的细节知之甚少。在这个项目中，我们建议应用新的地质年代学和古水文学方法来解释冰川和湖泊数据在一个单一的，封闭的流域：西部大盆地的古欧文斯河系统。我们将应用质谱U/Th和宇宙成因36 Cl定年法来完善终端盆地湖泊沉积物和海岸线的现有年代学。这一年表将与一个来自宇宙成因的36 Cl和碳-14冰川沉积物和表面在东部山脉内华达州，在欧文斯河的源头。这些新的和完善的年表将允许事件的顺序为冰川和湖泊系统相互比较。然后，将使用瞬态数值能量和质量平衡模型，从气候驱动力的角度对组合序列进行定量解释。最后，重建的气候历史可以与最近的冰芯和海洋沉积物记录的全球条件进行比较，以评估全球事件如何反映在大陆温度和水汽输送的变化中。设置.