CEDAR: Solar Cyclic and Climatic Influences on Upper Atmospheric Hydrogen Distributions

CEDAR：太阳周期和气候对高层大气氢分布的影响

• 批准号: 1343048
• 负责人: Susan Nossal
• 金额: $ 31.34万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2019-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1343048&HistoricalAwards=false
• 关键词: CEDAR; Solar; Cyclic; Climatic; Influences

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.

该项目从观察和建模的角度来解决太阳可变性和温室气体增加对上大气氢分布的影响。 Fabry-perot观察到跨越三个太阳能最小值的北部延迟的上大气氢α排放量建立了一个参考数据集，可用于与未来的观察结果和大气模型进行比较。该数据集显示出比由于温室气体的增加而导致的氢丰度增加的氢光学排放量的明显向上趋势。为了确保这不是校准工件的结果，通过使用更新的背景银河发射强度，当前的分析工具以及更新的对流层散射校正代码，将通过更新的知识来改善北半球长期Balmer-Alpha数据集的精度。此外，将比较北半球和南半球的观察结果。该项目要解决的主要科学问题如下：太阳环和气候对氢化物种高层偶联机制的影响是什么？从地球氢（地球上的氢种分布的上边界）发出的发射观测中，太阳能周期性和可能的​​长期趋势是什么？含氢的变化的预测幅度是什么？为了解决这个问题，整个大气社区气候模型（WACCM）将用于对太阳环和气候对中大气中和上层大气中的亚二烯分布的影响进行敏感性研究。 NCAR全球平均模型将用于研究这些强迫如何通过热圈传播。在两年的UW大学校园内的教师和本科生将参与这项工作。将进行公共外展活动，旨在提高有关气候变化科学的公共素养，并促进青年接触和参与科学的机会。