Collaborative Research: Scales of Hydrologic Transients in Holocene Lake Records: Ostracodes, Groundwater Flow, and Paleochemistry

合作研究：全新世湖泊记录中的水文瞬变尺度：介形类、地下水流和古化学

• 批准号: 9305571
• 负责人: Daniel Engstrom
• 金额: $ 9.11万
• 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: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9305571&HistoricalAwards=false
• 关键词: Collaborative; Research; Scales; Hydrologic; Transients

This proposal addresses the problem of determining the hydrochemical response of a groundwater-fed lake to climate change over Holocene time. We intend to determine the relative importance of ground water and surface water input to Elk Lake, Grant Co., Minnesota. We will examine and compare information obtained from ostracode (Crustacea) species distributions, ostracode shell chemistry, and models that describe hydrochemical reactions and groundwater flow. The proposed research will provide an independent means of determining how a lake interacted with groundwater during specific times of past climate change, as well as insight into how lake-groundwater systems can react to future climate change. Our approach will be 1) define the ground water source(s) flowing into Elk Lake at present; 2) recover a complete Holocene core from the lake; 3) reconstruct the solute history using ostracode species distributions, trace-elements, and stable isotope analyses; and 4) test two hypotheses concerning the groundwater input and resultant lake chemistry through Holocene time. This study will provide a new way of reconstructing regional changes in surface hydrology as it responds to climate change and has wide application to the field of hydrology and climatology. The results should be of practical value to hydrologists concerned with surface water-groundwater interactions, and to climatologists interested in climate model validation and forecasting of climate- induced hydrologic changes.

这一建议解决了确定 地下水补给湖泊对气候变化水化学响应 在全新世时期。 我们打算确定 地下水和地表水输入麋鹿湖，格兰特公司， 明尼苏达 我们将研究和比较从以下来源获得的信息： 介形虫（甲壳纲）种类分布，介形虫壳 化学和描述水化学反应的模型， 地下水流 这项研究将提供一个 独立的手段来确定湖泊如何与 在过去气候变化的特定时期， 作为对湖泊地下水系统如何对未来 气候变化 我们的方法是1）定义地下水 目前流入麋鹿湖的水源; 2）恢复一个完整的 湖泊全新世岩心; 3）重建溶质历史 利用介形虫种类分布、微量元素和稳定的 同位素分析;和4）测试有关的两个假设 全新世地下水输入和湖泊化学 时间 本研究将为区域性的城市重建提供一种新的思路 地表水文对气候变化的响应， 在水文气候领域有着广泛的应用。 研究结果对有关水文工作者有一定的实用价值 地表水和地下水的相互作用， 对气候模型验证和气候预测感兴趣- 引起的水文变化。