Late Quaternary Climate Change Across Northern Alaska: A Comparison of Lake-Level and Pollen Variations

阿拉斯加北部晚第四纪气候变化：湖泊水位和花粉变化的比较

• 批准号: 9500906
• 负责人: Bruce Finney
• 金额: $ 10.65万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-01 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9500906&HistoricalAwards=false
• 关键词: Late; Quaternary; Climate; Change; Across

Abstract ATM-9500906 Finney, Bruce University of Alaska Title: Late Quaternary Climate Change Across Northern Alaska: A Comparison of Lake-Level and Pollen Variations This research project will address paleoclimatic questions and hypotheses for northern Alaska during the late-Quaternary (21,000 yr BP to present) using lake-level records as proxies for effective moisture. Results of climate model simulations and conceptual paleoclimate scenarios provide hypotheses to be tested against the geologic record. Other questions are derived from regional changes in the paleovegetational record that require climatic explanations. Specific paleoclimatic questions are: 1) was there an east-west gradient in effective moisture across northern Alaska during the late glacial as well as the Holocene, 2) when did the major increase in effective moisture related to late-glacial circulation changes occur, 3) was precipitation either enhanced or reduced during the period 11,000-6000 (calibrated) yr BP, when temperatures were probably warmer that present, and 4) are there other rapid, regional effective moisture changes in the record? The major contributions of this research will be 1) empirical data on regional paleohydrology, and 2) an assessment of changes in vegetation and other factors of the terrestrial system (e.g., eolian processes and watershed geochemistry) in the light of the paleohydrologic and other paleoclimatic data.

摘要ATM-9500906 Finney，布鲁斯阿拉斯加大学题目：横跨北方阿拉斯加的晚第四纪气候变化：A 湖泊水位变化与花粉变化的比较 这个研究项目将解决古气候问题和假说的北方阿拉斯加在晚第四纪（21,000年BP到现在）使用湖泊水位记录作为代理有效水分。 气候模式模拟和概念性古气候情景的结果提供了一些假设，以供对照地质记录进行检验。 其他问题来自于古植被记录中的区域变化，需要气候解释。 具体的古气候问题有：1）在晚冰期和全新世期间，横跨北方阿拉斯加的有效湿度是否存在东西梯度，2）与晚冰期环流变化相关的有效湿度的主要增加发生在什么时候，3）在11，000 -6000年期间，降水是增加还是减少（校准）年BP，当温度可能是温暖的，目前，和4）是否有其他快速，区域有效的水分变化的记录？ 这项研究的主要贡献将是1）区域古水文学的经验数据，2）对植被和陆地系统其他因素（例如， 风成过程和流域地球化学）的古水文和其他古气候资料。