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

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，记录了最新更新世期间大规模气候突变的陆地记录。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在静期和间期条件之间的主要同位素变化。其中四个低洼与海洋环流的变化和圣巴巴拉盆地缺氧沉积物带的变化相吻合，在同一纬度。埃斯坦西亚盆地还包含了全新世中期极端干燥气候条件下的水文平衡变化记录。先前资助的研究通过应用基于物理的景观尺度水文模型，提供了将对Estancia盆地的水文响应与大气参数变化耦合所需的时间、空间、成分和水化学数据和框架。该项目将获得定义全新世中期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。我们建议使用高度响应的水文环境和经过测试的基于物理的模型来将Estancia盆地记录的极端气候变化与大气条件和气候变量的变化联系起来。高分辨率大气模式的输出将作为水文模式的输入，用于模拟关键气候事件。关键气候事件的水文模拟，包括间冰期、间冰期和全新世中晚期气候变化，将与大气模式的输出相协调，其长期目标是检验解释十年至千年尺度气候突变的假设。?？

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. ??