Collaborative Research: High-Resolution, Low-Latitude Paleoclimatology Through Scientific Drilling of Lake Bosumtwi, Ghana

合作研究：通过加纳博苏姆特维湖科学钻探获得高分辨率、低纬度古气候学

• 批准号: 0401908
• 负责人: Jonathan Overpeck
• 金额: $ 6.09万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-05-01 至 2005-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0401908&HistoricalAwards=false
• 关键词: Collaborative; Research; Resolution; Low; Latitude

This award is to augment $1.2M in operational funds from the International Continental Drilling Program (ICDP) to obtain multiple lake cores for paleoclimatic analyses from Lake Bosumtwi, a meteorite impact crater located in the tropical forest lowlands of Ghana, West Africa. The researchers aim to produce a multi-proxy and inter-annual to millennial scale record of climate change over the last ~1.0 million years (Ma). The data derived from the cores will be examined for potential linkages among climate from the North Atlantic, Africa, and the Asia regions. The lake is located beneath the seasonal passage of the Inter Tropical Convergence Zone (ITCZ) and is hydrologically closed with deep anoxic waters that preserve annual laminations. Previous research by the team has yielded seismic profiles that documented the impact origin of the crater while analyses of previously recovered piston sediment cores produced an 800-year record of environmental data. These cores have shown that the intensity of the African summer monsoon decreased during the Younger Dryas and during Heinrich 1 and 2 climatic events. The new sites will drill through multiple warm interglacial periods and will further the paleoclimate community's broader understand of climate variability from the Tropics. This research will be carried out in full collaboration with Ghanaian scientists to support capacity building and technology transfer between the US scientists and their Ghanaian colleagues. The research funds will also support American graduate students and provide them with a unique research experience.

该奖项将从国际大陆钻探计划（ICDP）中增加120万美元的运营资金，以获取多个湖泊核心，用于从Bosumtwi湖进行古气候分析，Bosumtwi湖是位于西非加纳热带森林低地的陨石撞击火山口。研究人员旨在在过去〜100万年（MA）中产生多种婚礼和千禧年气候变化的千禧年量表记录。将检查核心的数据，以了解来自北大西洋，非洲和亚洲地区的气候之间的潜在联系。该湖位于热带融合区（ITCZ）的季节性通道下方，并在水中封闭了深层缺氧水，可保留年度层压。该团队的先前研究产生了地震概况，这些曲线记录了火山口的影响，而对先前回收的活塞沉积物核心的分析产生了800年的环境数据记录。这些核心表明，非洲夏季季风的强度在年轻的德莱斯和海因里希1和2气候事件期间下降。新地点将在多个温暖的冰川间钻探，并将进一步进一步了解古气候社区对热带气候变化的广泛了解。这项研究将与加纳科学家完全合作，以支持美国科学家及其加纳同事之间的能力建设和技术转移。研究基金还将为美国研究生提供支持，并为他们提供独特的研究经验。