Late Quaternary Climates of Western Beringia

Am-9317569 Anderson，Patricia M.Brubaker，Linda B.华盛顿大学题目：西Beringia的晚第四纪气候该奖项支持北极湖泊和河口古气候(PALE)下的一个项目，该项目专注于第四纪晚期北极气候的时间、幅度和变化速度。要了解各区域对过去全球气候变化的复杂反应，需要：1)汇编大量有日期的古气候指标(例如花粉)的记录；2)通过确定这些指标的现代气候关系对这些指标进行校准；3)将从古数据推断的气候历史与定性或定量的古气候模型进行比较。虽然北美和欧洲北极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类似的信息。该奖项支持一个项目，该项目旨在分析湖心的花粉、孢子、植物大型化石和沉积物地球化学，以重建西贝林贾(西伯利亚东北部)晚第四纪的植被和气候。这些历史将为六个研究区域重建，这些区域今天涵盖了俄罗斯东北部的植被和气候范围。表层湖泥的分析将完善现代花粉-植被-气候关系的定义，并有助于化石数据的古气候解释。新的俄罗斯数据将允许更详细地描述跨柏林纪的古植被模式和推断的古气候。这种大尺度模式的定义将有助于对北极的古数据/全球气候变化模式进行比较，从而改善对高纬度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.