| 项目编号: | 1702704
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| 项目名称: | Collaborative Research: Quantifying past water table depth and hydroclimate with dissolved noble gas isotopes in groundwater |
| 作者: | Jeffrey Severinghaus
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| 承担单位: | University of California-San Diego Scripps Inst of Oceanography
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| 批准年: | 2017
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| 开始日期: | 2017-07-01
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| 结束日期: | 2020-06-30
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| 资助金额: | 351482
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | water table depth
; heavy isotope
; ancient groundwater
; research
; water resource
; noble gas isotope
; noble gas
; heavy gas
; water table
; past water table fluctuation
; water availability
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| 英文摘要: | Water resources are a critical issue for agriculture in the arid parts of the US, and it is likely that water availability will be affected by future climate change, yet it remains difficult to predict the magnitude of future rainfall changes. The proposed research will develop a new and precise method for quantifying past changes in water table depth, using measurements of dissolved noble gas isotopes in ancient groundwater. This knowledge of past water table fluctuations will help illuminate the regional rainfall response to climate variations, and strengthen predictions by providing rigorous tests of rainfall models.
The method is based on the demonstrated fact that heavy gases settle to the bottom of the stagnant column of air in the soil above the water table depth. The deeper the water table, the more extreme the enrichment of heavy isotopes, and these heavy isotopes become dissolved in the water thus preserving information about the water table depth in aquifers containing ancient groundwater. This groundwater is already routinely sampled to learn about past temperature from the abundance of the noble gases; the proposed research will add water table depth to the information that can be extracted from the samples. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89869
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Jeffrey Severinghaus. Collaborative Research: Quantifying past water table depth and hydroclimate with dissolved noble gas isotopes in groundwater. 2017-01-01.
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