Late Quaternary Climates of Western Beringia

摘要ATM-9317569安德森，帕特里夏M。 Brubaker，琳达B. 华盛顿大学题目：西白令加晚第四纪气候 该奖项支持北极湖泊和河口（PALE）古气候下的一个项目，该项目专注于第四纪晚期北极气候变化的时间，幅度和速率。 要了解区域对过去全球气候变化的复杂反应，需要：1）汇编大量具有良好日期的古气候指标记录（例如，花粉）;（2）通过确定这些代用指标的现代气候关系来校准代用指标;（3）将从古气候资料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类数据集，但北方西伯利亚几乎没有可比信息。 该奖项支持一个项目，旨在分析花粉，孢子，植物宏体化石和湖芯的沉积物地球化学，以重建西白令海（西伯利亚东北部）的晚第四纪植被和气候。 这些历史将被重建为六个研究领域，其中包括今天的植被和气候的范围在俄罗斯东北部。 对表层湖泥的分析将改善现代花粉-植被-气候关系的定义，并有助于化石数据的古气候解释。 新的俄罗斯数据将允许更详细地描述trans-Beringian古植被模式和推断古气候。 这种大尺度模式的定义将有助于北极的古数据/GCM比较，从而提高对全球气候变化的高纬度响应的理解。

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.