Late Quaternary Climates of Western Beringia

题目：西白令陆桥晚第四纪气候本奖项支持北极湖泊和河口古气候（PALE）项目，该项目主要研究晚第四纪北极气候的时间、幅度和变化速率。要理解复杂的区域对过去全球气候变化的响应，需要：1)收集大量年代准确的古气候指标（如花粉）记录；2)通过确定这些代用物的现代气候关系来校准它们；3)与定性或定量古气候模式的比较。虽然北美和欧洲北极地区许多地区的湖泊都有这样的数据集，但西伯利亚北部几乎没有可比的信息。该奖项支持一个旨在分析花粉、孢子、植物大化石和湖泊岩心沉积物地球化学的项目，以重建西白令陆桥（西伯利亚东北部）晚第四纪植被和气候。这些历史将被重建为六个研究区域，今天包括俄罗斯东北部的植被和气候范围。表层湖泥的分析将改善现代花粉-植被-气候关系的定义，并有助于化石资料的古气候解释。俄罗斯的新数据将允许对跨白令陆桥古植被模式和推断的古气候进行更详细的描述。这种大尺度模式的定义将有助于北极的古数据/GCM比较，从而提高对高纬度地区对全球气候变化的响应的理解。

Abstract ATM-9317569 Anderson, Patricia M. Brubaker, Linda B. University of Washington Title: Late Quaternary Climate of Western Beringia This award supports a project under paleoclimates in Arctic Lakes and Estuaries (PALE), a program that focuses on the timing, magnitude, and rates of change in arctic climates during the late Quaternary. Understanding the complex regional responses to past shifts in global climate requires: 1) the compilation of numerous well-dated records of paleoclimate indicators (e.g., pollen); 2) the calibration of these proxies by defining their modern climatic relationships; and 3) the comparison of climatic histories inferred from the paleo-data to qualitative or quantitative paleoclimatic models. Although such data set are available from lakes in many areas of the North American and European Arctic, comparable information is virtually absent from northern Siberia. This award supports a project designed to analyze pollen, spores, plant macrofossils, and sediment geochemistry of lake cores to reconstruct the late Quaternary vegetation and climate of Western Beringia (northeast Siberia). These histories will be reconstructed for six study areas, which today encompass the range of vegetation and climate in far northeast Russia. Analyses of surficial lake muds will improve the definition of modern pollen- vegetation-climate relationships and aid the paleoclimatic interpretation of fossil data. The new Russian data will allow a more detailed description of trans-Beringian paleovegetational patterns and inferred paleoclimates. Definition of such broad- scale patterns will help paleo-data/GCM comparisons for the Arctic, thereby improving the understanding of high latitude responses to global climatic changes.