Paleoclimate Records from Lake Sediments in a Cape Dyer- Quvitu Transect, Eastern Baffin Island, Arctic Canada

Am-9503279 Miller，科罗拉多吉福德大学标题：加拿大北极巴芬岛东部Dyer-Quvitu样带湖泊沉积物的古气候记录极地地区对温室气体增加的敏感性由全球环流模式描述。影响气候的北极边界条件的迅速变化，例如植被类型(特别是苔原和北方森林)、海冰和季节性积雪的范围和持续时间、以及大陆冰厚度/冰山排放，过去可能对北极以外的地区产生重大影响，未来也可能产生类似的影响。这些影响是目前人们对北极在全球气候系统中的作用感兴趣的基础。PALE倡议(来自北极湖泊和河口的古气候)的一个主要目标是获取和分析横跨环北极地区的一系列湖泊沉积岩芯。该项目专注于0-20,000年的时间段，对遇到的较旧记录和高分辨率较年轻记录进行机会性抽样。研究将继续进行湖泊取心研究工作，包括对花粉、硅藻、沉积学和同位素分析的解释。工作还在继续利用水生大型化石的同位素组成(碳和氧同位素)和保存在湖泊沉积物中的特定类别的溶解有机物质以及硅藻植物组合的变化来开发其他过去气候的替代指标。

Abstract ATM-9503279 Miller, Gifford University of Colorado Title: Paleoclimate Records from Lake Sediment in a Cape Dyer- Quvitu Transect, Eastern Baffin Island, Arctic Canada The sensitivity of the polar regions to increased greenhouse gases is described by global circulation models. Rapid changes in Arctic boundary conditions that influence climate, such as vegetation type (especially tundra vs boreal forest), extent and duration of sea ice and seasonal snow cover, and continental ice thickness/ice berg discharge may have had dramatic impacts outside the Arctic in the past, and may have similar future impacts. These impacts underlie current interest in the role of the Arctic in the global climate system. A primary objective of the PALE Initiative (Paleoclimate from Arctic Lakes and Estuaries) is to obtain and analyze a series of lake sediment cores that span the circum-arctic region. This project focuses on the 0-20,000 yr time period, with opportunistic sampling of older records and high-resolution younger records where encountered. Research will continue lake-coring research efforts, including the interpretation of pollen, diatom, sedimentological and isotopic analyses. Work also continues to develop additional proxies for past climate utilizing the isotopic composition (C- and O- isotopes) of aquatic macrofossils and specific classes of dissolved organic matter preserved in lake sediments and changes in diatom floral assemblages.