| 项目编号: | 1343048
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| 项目名称: | CEDAR: Solar Cyclic and Climatic Influences on Upper Atmospheric Hydrogen Distributions |
| 作者: | Susan Nossal
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| 承担单位: | University of Wisconsin-Madison
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| 批准年: | 2013
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| 开始日期: | 2014-04-01
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| 结束日期: | 2018-03-31
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| 资助金额: | USD328013
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| 资助来源: | US-NSF
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| 项目类别: | Continuing 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: | climatic influence
; hydrogen-containing species
; solar minima
; hydrogenous species distribution
; atmospheric model
; upper atmospheric hydrogeneous species distribution
; hydrogenous species
; upper atmospheric hydrogen balmer-alpha emission
; solar variability
; geocoronal hydrogen
; upper boundary
; upper atmospheric coupling
; hydrogen optical emission
; upper atmospheric hydrogen distribution
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| 英文摘要: | This project addresses the influence of solar variability and greenhouse gas increases on upper atmospheric hydrogen distributions from both an observational and modeling perspective. Fabry-Perot observations of upper atmospheric hydrogen Balmer-alpha emissions from Northern mid-latitudes over the time period spanning three solar minima establish a reference data set that can be used to compare with future observations and with atmospheric models. This data set shows an apparent upward trend in hydrogen optical emissions of greater magnitude than predicted alone from increases in hydrogen abundance due to the rise in greenhouse gases. In order to ensure that this is not a result of a calibration artifact, the accuracy of the Northern hemisphere long-term Balmer-alpha data set will be improved through use of updated knowledge of the background Galactic emission intensity, current analysis tools, and an updated tropospheric scattering correction code. In addition, observations from the Northern and Southern Hemisphere will be compared.
The major science questions to be addressed by this project are as follows: What are the solar cyclic and climatic influences on mechanisms governing lower to upper atmospheric coupling of hydrogenous species? What are the solar cyclic and possibly longer-term trends in emission observations from geocoronal hydrogen, the upper boundary of the Earth's hydrogenous species distribution? What are the predicted magnitudes for changes in hydrogen-containing species? To address this, the Whole Atmosphere Community Climate Model (WACCM) will be used to carry out sensitivity studies of solar cyclic and climatic influences on middle and upper atmospheric hydrogeneous species distributions. The NCAR Global Mean Model will be used to study how these forcings propagate through the thermosphere.
A faculty member at a two-year UW college campus and undergraduate students will be involved in this work. Public outreach activities will be carried out aimed at increasing public literacy about the science of climate change, and facilitating opportunities for youth exposure and involvement in the sciences. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/97128
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Susan Nossal. CEDAR: Solar Cyclic and Climatic Influences on Upper Atmospheric Hydrogen Distributions. 2013-01-01.
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