Collaborative Researach: Lake Bosumtwi, Ghana: High-resolution Paleoclimatogy and Seismic Reflection Site Survey

科罗拉多大学的ATM-9810254 OVERPECK乔纳森·T·科罗拉多大学题目：博苏姆特维湖，加纳：高分辨率古气候学和地震反射场地调查加纳博苏姆特维湖是古环境研究的重要和独特的资源。博苏姆特维湖沉积物在重建西非季风百年至千年尺度变化方面的价值已得到证明。分层计数和辐射测量数据证明，博苏姆特维沉积物记录的最后1000年是每年分层的，因此是重建和了解非洲大片地区年际至百年尺度气候变化的理想选择，没有其他此类记录。该奖项支持一个项目，以开展所需的实地和实验室工作，以制作第一个每年层叠的西非季风和萨赫勒干旱的连续记录，该记录可追溯到几个世纪甚至数千年。这一记录将被用来检验北大西洋可变性和西非降雨量之间的关系，这些关系是仅使用短暂的仪器记录来假设的。由于其独特的地理位置、气候敏感性和古环境潜力，博苏姆特维湖已被国际古环境界(即IGBP-PAGE过去的全球变化和ICDP国际大陆钻探计划)确定为科学钻探的高度优先事项。该项目将进行详细的高分辨率单通道和中分辨率地震反射调查，以规划科学优化和安全的钻井方案。

Abstract ATM-9810254 Overpeck, Jonathan T. University of Colorado Title: Lake Bosumtwi, Ghana: High-resolution Paleoclimatology and Seismic Reflection Site Survey Lake Bosumtwi, Ghana, is an important and unique resource for paleoenvironmental research. The value of the Lake Bosumtwi sediments has been demonstrated for reconstructing centennial to millennial-scale variations of the West African monsoon. Lamination counts and radiometric data prove that the last 1000 years of the Bosumtwi sediment record is annually-laminated (varved), and thus ideal for reconstructing and understanding interannual to centennial-scale climate variability in a vast area of Africa continuing no other such record. This award supports a project to carry out the field and laboratory work needed to produce the first annually-laminated continuous record of the West African Monsoon and Sahel drought extending back centuries and perhaps millennia. This record will be used to test relationships between North Atlantic variability and West African rainfall that have been hypothesized using the short instrumental record alone. Because of its unique location, climate sensitivity and paleoenvironmental potential, Lake Bosumtwi has been identified by the international paleoenvironmental community (i.e., IGBP-PAGES Past Global Changes and ICDP International Continental Drilling Programme ) as a high priority for scientific drilling. This project will conduct the detailed high-resolution single-channel and intermediate-resolution seismic reflection survey needed to plan a scientifically-optimal and safe drilling program.