| 项目编号: | 1640337
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| 项目名称: | Closing the Regional Ammonia and Nitrous Oxide Budgets of an Intensive Agricultural Region |
| 作者: | Timothy Griffis
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| 承担单位: | University of Minnesota-Twin Cities
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| 批准年: | 2016
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| 开始日期: | 2016-10-01
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| 结束日期: | 2019-09-30
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| 资助金额: | 499000
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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 - Atmospheric and Geospace Sciences
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| 英文关键词: | ammonia
; ammonia flux
; nitrous emission
; agricultural intensification
; nitrous oxide
; major ammonia hotspot
; nitrous oxide exchange
; regional atmospheric chemistry
; intensive field campaign
; agricultural system
; nitrous oxide emission
; high-resolution regional scale deposition
; nitrous oxide production
; nitrous oxide emission modeling
; deposition impact regional nitrous oxide emission
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| 英文摘要: | Agricultural intensification is increasing the emissions of ammonia and nitrous oxide that are altering regional atmospheric chemistry and global climate, respectively. The US Corn Belt is one of the five major ammonia hotspot observed by satellites largely from the high density of large cattle and swine operations there. The emitted ammonia can deposit on soils downwind and this can promote nitrous oxide production. The proposal will integrate measurements and modeling to quantify how ammonia fluxes amplify nitrous oxide emissions in the continental US. The science will help develop best practices that are sustainable in the future.
The research focus on analysis of ammonia fluxes and nitrous oxide exchange at natural and agricultural systems improve the mechanistic understanding model representations of these processes. The proposal focuses on the following tasks: (1) High precision and near-continuous measurement of ammonia at the University of Minnesota Tall Tower Trace Gas Observatory and using the results for model validation of its source transport and deposition; (2) Perform intensive field campaigns to characterize the landscape in the context of bi-directional NH3 exchange. (3) Simulate high-resolution atmospheric Nr deposition using regional and global models for constraining the soil nitrogen cycling and nitrous emissions. The models will be evaluated against the high-density data sets prior to their use for high-resolution regional scale deposition and nitrous oxide emission modeling. The research will test hypotheses that ammonia deposition impacts regional nitrous oxide emissions and determine constrained emission factors for this volatization in regional (continental US) models. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90850
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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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