Varved-sediment Records of Rapid Climatic Change About 10,700 Years Ago

Varved 沉积物记录了大约 10,700 年前气候快速变化

• 批准号: 9005752
• 负责人: Herbert Wright
• 金额: $ 9.86万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005752&HistoricalAwards=false
• 关键词: Varved; sediment; Records; Rapid; Climatic

The Younger Dryas climate event is important in earth history because it is a rapid reversal in climate change that occurred without any known, direct external forcing. Thus it is the best example of the earth's internal feedbacks causing climate change. At present, the effects of the Younger Dryas cooling event are poorly known in many parts of the world. The purpose of this research is to determine the timing and climatological effects of this event in Minnesota and Wisconsin. The PI will use annually-laminated lake sediments to precisely date the timing of this vegetation change. Then the PI will evaluate the pollen in the cores to determine the changes in temperature and precipitation that accompanied the climatic event. Given the possibility of internal feedbacks altering the effects of future greenhouse warming, it is important to study this past example in order to better predict future changes in climate.

年轻的仙女座气候事件在地球历史上具有重要意义，因为它是气候变化的一次快速逆转，发生在没有任何已知的直接外部强迫的情况下。因此，这是地球内部反馈导致气候变化的最好例子。目前，世界上许多地区对年轻仙女木降温事件的影响知之甚少。这项研究的目的是确定这一事件在明尼苏达州和威斯康星州发生的时间和气候影响。PI将使用每年分层的湖泊沉积物来精确测定这种植被变化的时间。然后，PI将评估岩芯中的花粉，以确定伴随气候事件的温度和降水的变化。考虑到内部反馈可能改变未来温室气体变暖的影响，研究这一过去的例子很重要，以便更好地预测未来的气候变化。