Collaborative Research: (ESH) Hydrologically Coupled Estimates of Decadal to Millennial Climate Variability During the Holocene and Late Pleistocene: Estancia Basin

合作研究：（ESH）全新世和晚更新世期间十年至千年气候变化的水文耦合估计：埃斯坦西亚盆地

• 批准号: 9618077
• 负责人: Bruce Allen
• 金额: $ 7.28万
• 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: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9618077&HistoricalAwards=false
• 关键词: Collaborative; Research; ESH; Hydrologically; Coupled

9618077 Allen A high-resolution record of climate changes, reconstructed from lake sediments and shoreline features in Estancia Basin, central New Mexico, has documented a land-based record of large and abrupt shifts in climate during the latest Pleistocene. Nine major fluctuations in lake level between ~24 and ~12 kyr correspond, within errors of dating, to major isotopic shifts between stadial and interstadial conditions in Greenland ice cores. Four of the lowstands coincide with changes in ocean circulation and zones of anoxic sediment in Santa Barbara Basin, at the same latitude. Estancia Basin also contains a record of changes in hydrologic balance for conditions of extreme, dry climate in the mid-Holocene. Previously funded research is providing the temporal, spatial, compositional, and hydrochemical data and framework needed for coupling hydrologic responses to Estancia Basin to changes in atmospheric parameters through the application of physically based, landscape-scale hydrologic models. This project will obtain the temporal, spatial, and geomorphic data needed to define the mid-Holocene hydrologic response and subsequent changes in hydrologic meteorological system will be employed in order to modify and apply existing hydrologic models. We propose to use the highly responsive hydrologic setting and a tested physically based model to link the extreme changes in climate recorded in Estancia Basin with changes in atmospheric conditions and climatic variables. Output from high-resolution atmospheric models will be used as input to the hydrologic models in simulations of key climate events. Hydrologic simulations for key climatic events, including stadials, interstadials, and mid- to late Holocene climate changes will be reconciled with output from atmospheric models, with the long-term objective of testing hypotheses for explaining abrupt, decade- to millenium-scale changes in climate. ??

小艾伦9618077 根据新墨西哥州中部埃斯坦西亚盆地的湖泊沉积物和海岸线特征重建的高分辨率气候变化记录，记录了最晚更新世期间气候大幅度突变的陆基记录。 在测年误差范围内，湖平面在24 ~12 kyr之间的9次主要波动对应于格陵兰冰芯中stadial和interstadial条件之间的主要同位素变化。 其中四个低水位与同一纬度的圣巴巴拉盆地海洋环流和缺氧沉积物区的变化相吻合。 埃斯坦西亚盆地还记录了全新世中期极端干旱气候条件下的水文平衡变化。 以前资助的研究提供了时间，空间，成分和水化学数据和框架耦合水文响应埃斯坦西亚盆地大气参数的变化，通过应用物理为基础的，大规模的水文模型。 该项目将获得确定中全新世水文响应所需的时间、空间和地貌数据，并将采用水文气象系统的后续变化，以修改和应用现有的水文模型。 我们建议使用高度响应的水文设置和测试的物理为基础的模型，以连接在埃斯坦西亚盆地记录的极端气候变化与大气条件和气候变量的变化。 高分辨率大气模型的输出将用作模拟关键气候事件的水文模型的输入。 水文模拟的关键气候事件，包括stadials，interstadials，和中晚全新世气候变化将与大气模型的输出，长期目标是测试假设解释突然，十年至千年尺度的气候变化。 ??