Quaternary Paleoclimatic Variations of Beringia: Large-scale Controls and Regional Responses

Am-9532074 Bartlein，帕特里克·J·俄勒冈大学标题：贝林贾的第四纪古气候变化：大尺度控制和区域响应北极的气候系统是全球系统的一个关键组成部分，因此，了解北极古气候变化的性质是预测该地区如何对大尺度气候控制的变化做出反应的重要因素。这项PALAR/ARCS奖支持对贝林贾第四纪古生态记录的分析，以a)记录过去气候变化的性质和大小，b)检验关于区域气候变化控制的假设，以及这些控制的变化如何在区域和地方一级表达，以及c)利用该区域越来越多的古环境记录，用于研究关键断面上的古气候变化，并用于模型验证研究。这种分析需要汇编该区域的现代气候和植被数据，并利用它们来建立植被和气候之间的关系。然后，这些关系可用于a)从气候角度解释化石-花粉数据，从而说明过去气候变化的范围；b)通过将“观察到的”植被变化记录与假设所暗示的情况进行比较，检验关于过去气候变化控制的具体假设；以及c)验证气候模型对北极古气候的模拟。

Abstract ATM-9532074 Bartlein, Patrick J. University of Oregon Title: Quaternary Paleoclimatic Variations of Beringia: Large-scale Controls and Regional Responses The climate system of the Arctic is a key component of the global system, and an understanding of the nature of paleoclimatic variations in the Arctic is therefore an important element in predicting how that region may respond to changes in the large- scale controls of climate. This PALE/ARCSS award supports the analysis of Quaternary paleoecological records from Beringia to a) document the nature and magnitude of past climatic changes, b) test hypotheses about the controls of regional climatic variations, and how changes in those controls are expressed at the regional and local levels, and c) exploit the growing number of paleoenvirnomental records from this region for use in the examination of paleoclimatic variations along key transects and for application in model-validation studies. This analysis requires the compilation of modern sets of climate and vegetation data from the region, and their use to establish relationships between vegetation and climate. These relationships can then be applied to a) interpret fossil-pollen data in climate terms, thereby illustrating the range of past climate changes, b) test specific hypotheses about the controls of past climatic variations by comparing the "observed" record of vegetation change with that implied by the hypotheses, and c) validate climate model simulations of Arctic paleoclimates.