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

9618077艾伦从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，记录了最近更新世气候大而突然变化的陆基记录。在~24到~12KYR之间的九个主要湖平面波动，在测年误差范围内，对应于格陵兰冰芯平日和年际条件之间的主要同位素位移。其中四个低水位与同一纬度的圣巴巴拉盆地的海洋环流和缺氧沉淀区的变化相吻合。埃斯坦西亚盆地还记录了全新世中期极端干燥气候条件下的水文平衡变化。以前得到资助的研究正在提供所需的时间、空间、成分和水化学数据和框架，以便通过应用基于物理的、景观尺度的水文模型，将对埃斯坦西亚盆地的水文响应与大气参数的变化联系起来。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，并将利用水文气象系统的后续变化来修改和应用现有的水文模型。我们建议使用高响应性的水文环境和经过测试的基于物理的模型，将Estancia盆地记录的气候极端变化与大气条件和气候变量的变化联系起来。高分辨率大气模型的输出将被用作关键气候事件模拟中的水文模型的输入。对关键气候事件的水文模拟将与大气模型的结果相一致，包括场站、场间气候变化和全新世中后期气候变化，长期目标是检验用于解释气候突变的假设，这些假设是十到千年尺度的变化。?？

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. ??