A High-Resolution Record of Holocene Climate Variability from Lake Edward, Central Africa

中非爱德华湖全新世气候变化的高分辨率记录

• 批准号: 0314832
• 负责人: Tom Johnson
• 金额: $ 19.09万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0314832&HistoricalAwards=false
• 关键词: Resolution; Record; Holocene; Climate; Variability

Tropical Africa is one of three major centers of deep atmospheric convection that energize the Earth's atmosphere through latent heating. There is much to be learned about how tropical Africa's climate contributes to global climate. Lake Edward is a 120-m deep rift lake situated on the eastern edge of the Congo basin, and is perfectly situated to record climate variability in one of the most immense monsoon systems on the planet. The research will generate a decade- to century-scale record of moisture balance based on Holocene sediments from Lake Edward. The main goal of this research is to understand the causes of multi-decade to millennial-scale Holocene climate events in Africa. The research is designed to build upon and refine previous studies by focusing high-resolution analyses on time intervals previously not analyzed in the Lake Edward region: the last 1,000 years and the early Holocene. Results from these analyses will complement ongoing high-resolution studies of the interval 1,000 to 5,000 yr BP in Lake Edward. The combined dataset will allow testing of linkages between continental Africa, the tropical oceans, high-latitudes, and external forcing (i.e. solar variability) at a variety of time-scales. The researcher will develop high-resolution geochemical and stable isotopic stratigraphies from sediment cores already taken from both Lake Edward and nearby crater lakes. Results of this research could significantly advance our understanding of tropical paleoclimate dynamics. This research relates to several areas of paleoclimate research priorities, including the need for analysis of the full range of climate variability over the past 11,000 years from an important monsoon system, and the testing of regional patterns and phasing of climate change within tropical Africa and the global climate system.

热带非洲是深度大气对流的三个主要中心之一，通过潜在的加热为地球的大气提供了能量。关于热带非洲气候如何促进全球气候的原因，还有很多值得一看的知识。爱德华湖是位于刚果盆地东部边缘的120米深裂湖，非常适合记录地球上最巨大的季风系统之一的气候变化。这项研究将基于爱德华湖的全新世沉积物产生十年到世纪的水分平衡记录。这项研究的主要目的是了解非洲千禧一代全新世气候事件的多年原因。这项研究旨在通过以前未在爱德华湖地区未分析的时间间隔将高分辨率分析重点放在以前的研究中：过去的1000年和早期全新世。这些分析的结果将补充爱德华湖中1,000至5,000年bp间隔的高分辨率研究。合并的数据集将允许在各种时间尺度上测试非洲大陆，热带海洋，高贴层和外部强迫（即太阳可变性）之间的联系。研究人员将从已经从爱德华湖和附近的火山口湖中采取的沉积物岩心开发高分辨率的地球化学和稳定的同位素地层。这项研究的结果可以大大提高我们对热带古气候动态的理解。这项研究涉及古气候研究优先级的几个领域，包括在过去的11，000年中分析重要的气候变异性，从重要的季风系统中分析，以及对热带非洲和全球气候系统内气候变化的测试以及对气候变化的测试。