EAGER - Subterranean Ground Water Discharge (SGD) in the Arctic as a Source of Atmospheric Methane ? A Proof of Concept Study

EAGER - 北极的地下水排放 (SGD) 作为大气甲烷的来源？

• 批准号: 1114485
• 负责人: Adina Paytan
• 金额: $ 26.72万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-15 至 2016-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1114485&HistoricalAwards=false
• 关键词: EAGER; Subterranean; Ground; Water; Discharge

The major objective of this proof of concept study is to evaluate the contribution of Subterranean Groundwater Discharge (SGD) in the Arctic to the global methane budget. Methane is a potent greenhouse gas and large natural reservoirs exist in Arctic soils and permafrost. The working hypothesis is that methane released from thawing permafrost in the Arctic is transported via groundwater flow (above and below the permafrost layer) and enters the atmosphere via coastal waters and lakes. This source of methane may be realized as an important source of natural methane to the atmosphere and may provide a positive feedback to global warming.The objectives of the study are: 1) To estimate the magnitude of subterranean groundwater discharge and associated methane flux into lakes and coastal waters in Alaska at three representative sites. 2) To evaluate methane evasion rates from the water column to the atmosphere. 3) To determine if the contribution of methane input from subterranean groundwater discharge to the global methane budget is significant, and if so 4) To use the preliminary data to design a more through research plan that will enable precise estimates of fluxes and provide a basis for global extrapolation of results such that the contribution of this source to current and future climate changes and the global methane budget will be possible.The project will support a graduate student full time for two years. Undergraduate students in the ACCESS program and the California Alliance for Minority Participation in Science, Engineering and Mathematics program at UCSC will also participate in the proposed work. The PIs will work with COSEE Alaska to ntegrate this work in their outreach and education activities including teacher workshops, symposia, and work with local communities in Alaska.

这项概念验证研究的主要目的是评估北极地下地下水排放（SGD）对全球甲烷预算的贡献。甲烷是一种强效的温室气体，在北极土壤和永久冻土中存在着大量的天然储层。目前可行的假设是，北极融化的永久冻土释放的甲烷通过地下水（在永久冻土层的上方和下方）运输，并通过沿海水域和湖泊进入大气。这一甲烷来源可能是大气天然甲烷的重要来源，并可能对全球变暖提供正反馈。本研究的目的是：1)在三个有代表性的地点估计阿拉斯加地下地下水排放和相关的甲烷通量进入湖泊和沿海水域的大小。2)评估从水柱到大气的甲烷逃逸率。3)确定地下地下水排放的甲烷输入对全球甲烷收支的贡献是否显著，如果显著，4)利用初步数据设计一个更全面的研究计划，使通量能够得到精确估计，并为结果的全球外推提供依据，从而使这一来源对当前和未来气候变化和全球甲烷收支的贡献成为可能。该项目将资助一名研究生全日制学习两年。加州大学圣克鲁兹分校ACCESS项目和加州少数族裔参与科学、工程和数学项目联盟的本科生也将参与拟议的工作。pi将与阿拉斯加COSEE合作，将这项工作纳入其外联和教育活动，包括教师讲习班、专题讨论会，并与阿拉斯加当地社区合作。