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

题目：加拿大东部巴芬岛Cape Dyer- Quvitu样带湖泊沉积物的古气候记录。全球环流模式描述了极地地区对温室气体增加的敏感性。影响气候的北极边界条件的快速变化，如植被类型（特别是苔原与北方森林）、海冰和季节性积雪的范围和持续时间，以及大陆冰层厚度/冰山流量，过去可能对北极以外地区产生巨大影响，未来也可能产生类似影响。这些影响使人们对北极在全球气候系统中的作用产生了当前的兴趣。“北极湖泊和河口古气候”项目的一个主要目标是获取和分析一系列横跨环北极地区的湖泊沉积物岩心。该项目侧重于0-20,000年的时间段，对旧记录和遇到的高分辨率新记录进行机会抽样。研究将继续进行湖芯研究工作，包括花粉、硅藻、沉积学和同位素分析的解释。利用水生大型化石的同位素组成（C-和O-同位素）和湖泊沉积物中保存的特定类别的溶解有机质以及硅藻植物组合的变化，工作还在继续开发过去气候的其他代用物。

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.