权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

加拿大北极地区东巴芬岛代尔角-曲维图横断面湖沉积物的古气候记录

基本信息

批准号：
9503279
负责人：
Gifford Miller
金额：
$ 20.25万
依托单位：
University of Colorado at Boulder
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-05-01 至 1998-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9503279&HistoricalAwards=false
关键词：
Paleoclimate Records Lake Sediments Cape

项目摘要

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.

摘要ATM-9503279米勒，科罗拉多吉福德大学标题：戴尔角湖泊沉积物的古气候记录- Quvitu样带，东巴芬岛，北极加拿大全球环流模型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迅速变化，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厚度/贝格排放，过去可能对北极以外地区产生巨大影响，未来可能产生类似影响。这些影响是目前人们对北极在全球气候系统中作用的关注的基础。北极湖泊和河口的古气候（PALE Initiative）的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。该项目的重点是0- 20，000年的时间段，在遇到老记录和高分辨率的年轻记录的机会抽样。研究工作将继续进行湖芯取样研究，包括花粉、硅藻、沉积物和同位素分析的解释。利用水生宏化石的同位素组成（C-和O-同位素）和湖泊沉积物中保存的溶解有机物的特定类别以及硅藻植物组合的变化，还在继续开发过去气候的其他替代物。