Collaborative Research: Laboratory and Modeling Studies to Resolve a Grand Challenge for Upper Atmospheric Science

合作研究：实验室和模型研究解决高层大气科学的巨大挑战

• 批准号: 2312191
• 负责人: Konstantinos Kalogerakis
• 金额: $ 55.93万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2312191&HistoricalAwards=false
• 关键词: Collaborative; Research; Laboratory; Modeling; Studies

This collaborative project will exploit the synergy of space-based observations, atmospheric modeling, and laser-based laboratory experiments to resolve the origins of the CO2 15-um emission. It aims to provide a better quantification of upper atmospheric radiative cooling by IR emissions through multi-disciplinary research and educational activities that promote a broader appreciation of the complexity of thermal energy balance in planetary atmospheres. The project will enable improved determination of atmospheric temperature profile retrievals from satellite observations of the CO2 15-um emission and advance our understanding of radiative balance in the atmospheres of Earth, Mars, and Venus. The work has the potential to add new knowledge to the radiative energetics of the MLT and address the long-standing question of CO2 15-um excitation and deexcitation processes. It will also advance new knowledge relevant to other research areas such as molecular energy transfer, chemical lasers, extrasolar planetary atmospheres, the extreme environments in the shock waves generated during space vehicle reentry, as well as chemical reaction dynamics and kinetics. The results of this research benefit modelers of planetary atmospheres within and beyond our solar system, theoreticians, and experimentalists, and enhance the scientific returns of ground- and space-based remote sensing observations. This project will also contribute to the education and formative research experiences of a Ph.D. graduate student and one or more postdoctoral fellows and summer undergraduate students.The most important process controlling the population of CO2(nu-2) is assumed to be its excitation and relaxation in collisions of CO2 with thermalized atomic oxygen in its ground state, O(3P). This process is poorly understood despite numerous studies over the past several decades. There are telltale signs of a major fundamental deficiency in our understanding of the underlying processes. This collaborative research effort combines (1) analysis of ground- and space-based observations to quantify previously unrecognized sources of the CO2 15-µm emission, (2) laser-based laboratory experimental studies of the O + CO2 interaction, and (3) state-of-the-art, non-LTE atmospheric modeling calculations to reevaluate the global thermal balance of the MLT in the 15-µm CO2 band. The team will conduct laboratory studies of O + CO2 collisions to 1) measure the rate constant for relaxation of the CO2(010) vibrational level by O atoms, 2) determine its temperature dependence from 150 K to 600 K, 3) investigate the collision energy dependence of CO2 vibrational excitation in collisions with O atoms, and 4) characterize the concentration of O atoms in the interaction region and their diffusion out of the observation volume. They will also perform observation analysis of SABER and LIDAR data, theory, and Non-LTE modeling studies of O + CO2 Collisions.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这种协作将利用二氧化碳15-UM发射的起源大气建模的协同作用。在行星中的热能平衡。对于辐射的二氧化碳15-UM激发和去脱水过程的长期问题。我们的Sorar系统和实验者，并增强了基于空间的MOTE感应观察的科学回报。夏季地下本科生。控制二氧化碳种群（NU-2）的最重要的过程，其兴奋和放松在二氧化碳与热原子氧气状态下的二氧化碳碰撞中，尽管这一过程很差。我们对协作努力的理解的过去迹象结合了（1）对基于空间的观测值的分析，以使二氧化碳排放的先前未被识别的来源，基于激光的基于激光的实验室实验研究O + CO2相互作用（O + CO2相互作用）（ 3）F-Then-Art，非LTE大气模型在15 µm CO2频段中重新评估MLT的全局热平衡。 ，2）确定从150 K到600 K的温度依赖性，3）与原子相碰撞中CO2振动的碰撞依赖性4）相互作用军团中的OTOM的碰撞，并且它们也将从观察量中扩散对SABER和LIDAR数据进行观察分析，以及O + CO2 Collisons的非LTE建模研究。该奖项反映了NSF'Sftory Mission，并且通过使用基金会的知识分子和更广泛的影响评估标准评估，认为值得一提的是值得支持的。 。