Tapping outstanding new lake records of annual- to millennial-scale Holocene climate variability in the north Pacific region

挖掘北太平洋地区年至千年尺度全新世气候变化的杰出新湖泊记录

基本信息

批准号：
1602106
负责人：
Darrell Kaufman
金额：
$ 51.7万
依托单位：
Northern Arizona University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-07-01 至 2021-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1602106&HistoricalAwards=false
关键词：
Tapping outstanding new lake records

项目摘要

Understanding climate variability over a wide range of timescales is a primary objective of climate science research because it is likely to improve our ability to foresee future climate. The investigators will document past (Holocene = 12,000 years) climate changes on time scales ranging from annual to millennial using evidence from sediments stored in lakes around Anchorage, Alaska, where climate closely tracks the broader North Pacific region. In addition, the sedimentary records contain information about: (1) ash-fall hazards from Cook Inlet volcanoes, (2) the magnitude and frequency of major earthquakes, (3) changes in glacier meltwater input to Eklutna Lake, a major source of electricity and freshwater for Anchorage, and (4) long-term environmental variability, which serves as a baseline reference for recent ecosystem changes. The project will support early-career scientists and will train graduate and undergraduate students.This study will take advantage of the best annually laminated (varved) sediment -- among the most valuable sources of proxy climate data -- ever recovered from Alaska. Fluctuations in varve thickness and grain size of sediments recovered from the glacier-fed study lakes reflect major hydroclimate changes. In addition, new sediment cores from non-glacial lakes will provide a multi-proxy approach to understanding how shifts in the mean state of climate during the Holocene were associated with changes in north Pacific climate variability.

了解大范围时间尺度内的气候变化是气候科学研究的主要目标，因为它可能提高我们预测未来气候的能力。研究人员将利用阿拉斯加安克雷奇周围湖泊中沉积物的证据，记录过去（全新世 = 12,000 年）气候变化的时间尺度，从每年到千年。阿拉斯加安克雷奇周围的湖泊气候密切跟踪更广泛的北太平洋地区。此外，沉积记录还包含以下信息：(1) 库克湾火山的火山灰坠落危害，(2) 大地震的震级和频率，(3) 流入主要电力来源埃克卢特纳湖的冰川融水变化和安克雷奇的淡水，以及（4）长期环境变化，作为近期生态系统变化的基线参考。该项目将为职业生涯早期的科学家提供支持，并培训研究生和本科生。这项研究将利用从阿拉斯加回收的最好的年度层状（变化）沉积物——最有价值的代理气候数据来源之一。从冰川供水的研究湖泊中回收的沉积物厚度和粒度的波动反映了主要的水文气候变化。此外，来自非冰川湖泊的新沉积物岩芯将提供一种多代理方法，以了解全新世期间气候平均状态的变化如何与北太平洋气候变率的变化相关。