High-resolution Stratigraphy: Application to Hydrologic- Climatic Reconstruction in Southwestern United States

这是一个更新的研究，以建立一个气候参考 一节检查异常大的同步性 在此之前，期间，以及 末次盛冰期后（~ 35 ka ~ 12.5ka）。 的 新墨西哥州中部水文封闭的埃斯坦西亚盆地 特别适合作为参考部分，因为它 在极锋急流下的先前位置，由于其 不间断高分辨率地层和古生物 记录，因为它记录了一个强大的，明确的，可衡量的 应对气候变化。 丰富的介形虫和花粉 可用于AMS约会。 采样间隔，由于高 积累速率和弱生物扰动，具有实际的解决方案 气候变化的影响。 紧密间隔（~50- 年）分析沉积物成分、氧18和碳13， 水化学（介形虫物种丰度），沿着质量- 平衡计算和水文模型将用于 以几百年到几千年的时间尺度来量化P-E。 灰色- 比例图像链接到组成和其他变化分析在 年际间隔将更加紧密， 世纪尺度的气候变化 记录的气候模式 变异性包括~2000年高位林和低位林，非常强 ~200- 250年，蒙德尺度振荡，~20年周期。 基于AMS的更精确的年龄模型和年代地层学 大量介形虫的年代测定将决定 异常大和快速的气候波动记录在 埃斯坦西亚遗址在盛冰期和盛冰期后期 同位素第三阶段 埃斯坦西亚参考部分将是 第一份完整的陆基高分辨率变化年表 在这段重要的时间里， 它将作为 联系和解释区域变化的基础， 气候以及半球和全球气候事件。

This is a renewal of research to establish a climatic reference section for examining the synchroneity of the exceptionally large and rapid changes in climate that occurred before, during, and after the last glacial maximum (~35Ka to 12.5ka). The hydrologically closed Estancia basin in central New Mexico is especially well suited as a reference section because of its previous location under the Polar Front Jet Stream, because of its uninterrupted high-resolution stratigraphic and paleontologic record, and because it recorded a strong, clear, and measurable response to climate forcing. Abundant ostracodes and pollen are available for AMS dating. The sampling interval, owing to a high accumulation rate and weak bioturbation, has a practical resolution for changes in climate of less than a decade. Closely spaced (~50- yr) analyses of sediment composition, oxygen 18 and carbon 13, and hydrochemistry (ostracode species abundance), along with mass- balance calculations and a hydrologic model will be used to quantify P-E on the time scale of centuries to millennia. Gray- scale images linked to compositional and other changes analyzed at more closely spaced intervals will characterize interannual to century-scale climatic variability. Patterns of recorded climatic variability include ~2000-yr highstand and lowstands, very strong ~200-to 250-yr, Maunder-scale oscillations, and ~20-years cycles. A more accurate age model and chronostratigraphy based on AMS dating of abundant ostracodes will determine the timing of the unusually large and rapid climatic fluctuations recorded at the Estancia site during the glacial maximum and during the later part of isotope stage 3. The Estancia reference section will be the first complete, land-based high-resolution chronology for changes in climate during this important time interval. It will serve as the basis for correlating and interpreting regional shifts in climate as well as hemispheric and global climatic events.