Line Shape Parameters and Their Temperature Dependence for Molecules of Importance in Earth's Atmosphere

地球大气中重要分子的线形参数及其温度依赖性

• 批准号: 0803135
• 负责人: Robert Gamache
• 金额: $ 35.61万
• 依托单位: University of Massachusetts Lowell
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0803135&HistoricalAwards=false
• 关键词: Line; Shape; Parameters; Their; Temperature

The Principal Investigator (PI) plans to develop a theoretical framework to calculate pressure-broadened half-widths and pressure-induced line shifts for trace gases in the terrestrial atmosphere. The half-width remains the major source of error in the spectral parameters used for reducing remote sensing data and in line-by-line models used to calculate radiative forcing from greenhouse gases. The inclusion of the line shift in profile retrievals also reduces the error in the procedure. For applications to the Earth's atmosphere, data are needed for thousands of ro-vibrational transitions. Hence a theoretical model is needed that is computationally efficient and capable of determining gamma and delta within the needs of the spectroscopic and remote sensing communities. In this work the temperature dependence of the half-width and the line shift will be investigated. The vibrational state, rotational state, and temperature dependence of these collision-induced parameters will be investigated.Broader impacts include education of a postdoctoral student and three undergraduate students in the research project. The work will also provide resources for research and education. All the results of the calculations will be made available online (http://faculty.uml.edu/Robert_Gamache). The line shape information for atmospheric molecules will be incorporated into the HITRAN molecular absorption parameter database for use by the community. The contributions beyond science and engineering are that the results will be used by the remote sensing community and will allow them more confidence in their data. These results will allow a better understanding about planet Earth, its energy balance, how the concentration of ozone and other gases are changing with time, and how climate is evolving. This knowledge will allow for better regulation and stewardship of the planet's interacting systems and will allow better presentations of the information to the citizens of the United States and the world.

首席研究员计划开发一个理论框架，以计算地球大气中痕量气体的压力加宽半宽度和压力引起的谱线位移。 半宽度仍然是用于减少遥感数据的光谱参数和用于计算温室气体辐射强迫的逐线模型的主要误差来源。 在轮廓检索中包括线偏移也减少了过程中的误差。 对于地球大气层的应用，需要数千个振转跃迁的数据。 因此，需要一个理论模型，计算效率高，能够确定伽马和三角洲的光谱和遥感社区的需要。 在这项工作中的半宽度和线位移的温度依赖性将被调查。 研究这些碰撞诱导参数的振动态、转动态和温度依赖性。更广泛的影响包括在研究项目中培养一名博士后和三名本科生。 这项工作还将为研究和教育提供资源。 所有计算结果将在网上公布（http：//faculty.uml.edu/Robert_Gamache）。 大气分子的线形信息将被纳入HITRAN分子吸收参数数据库，供社区使用。 科学和工程以外的贡献是，遥感界将使用这些结果，使他们对自己的数据更有信心。 这些结果将使我们更好地了解地球，它的能量平衡，臭氧和其他气体的浓度如何随时间变化，以及气候如何演变。 这些知识将有助于更好地管理和管理地球上的相互作用系统，并有助于更好地向美国和世界公民提供信息。