SGER: Midwest Lake Coring Swath for Holocene Varves

摘要本提案寻求资金支持 1999 年夏季的 SGER 探险活动，从 9-12 个沼泽湖点收集长（10 米）库伦伯格活塞芯，有效利用多种科学需求、技术发展和后勤机会。支持者已经确定了密歇根州约 30 个深度超过 25m 的湖泊，这些湖泊具有形成非冰川钙质全新世 varve 序列的巨大潜力。主要的科学目标是收集一套核心来测试太阳节律和突发气候事件的假设。如果受到外部强迫，这些应该在大陆范围内的类似时间窗口内保持一致，这是最近完成的明尼苏达州遗址论文面临的一个挥之不去的挑战。该试点项目还承诺取得旨在促进地球系统历史界发展的其他重大成就：1）完成高度机动且经济高效的系统的开发，用于在深度超过 25m 的湖泊中收集长达 14m 的活塞芯。然后，该系统将可供其他研究团队使用，2）在 LRC 培训一支由 4 人组成的年轻取芯操作团队，他们可以为该社区提供持续的专业知识，3）根据新的协议和管理标准收集和描述有价值的岩心，这将促进研究并向其他研究项目提供样本。

AbstractThis proposal seeks funds to support a summer 1999 SGER expedition to collect long (l0+m) Kullenberg piston cores from a swath of 9-12 varved lake sites that takes efficient advantage of several convergent scientific needs, technical developments, and logistical opportunities. The proponents have identified some 30 lakes deeper than 25m across Michigan with high potential for non-glacial calcareous Holocene varve sequences. The main scientific goal is collect a suite of cores to test hypotheses of solar rhythms and abrupt climatic events. If externally forced, these should be coherent in similar time-windows on a continental scale, a lingering challenge from a recently-completed thesis for sites in Minnesota. This pilot project also promises other significant achievements intended to promote the Earth System History community: 1) to complete development of a highly-mobile and cost-effective system for collecting piston cores up to 14m long in lakes greater than 25m deep. This system will then become available to other investigator teams, 2) to train a young coring operations team of 4 persons at LRC who can provide continuing expertise to this community, and 3) to collect and describe valuable cores according to new standards of protocol and curation that will catalyze research and provide samples to other investigator projects.