Calculation of Line Shifts and Line Widths for Atmospherically Important Gases: Application to H2O and CH4 Perturbed by N2 or O2

对大气中重要气体的线位移和线宽度的计算：应用于受 N2 或 O2 扰动的 H2O 和 CH4

• 批准号: 9003094
• 负责人: Robert Gamache
• 金额: $ 18.91万
• 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: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9003094&HistoricalAwards=false
• 关键词: Calculation; Line; Shifts; Widths; Atmospherically

A theoretical framework to calculate pressure-broadened halfwidths with an uncertainty of ~ 5% for atmospherically important species will be developed. Calculations are also expected to yield pressure-induced line shifts. Two approaches to computing the halfwidth and line shift for water vapor perturbed by nitrogen or oxygen will be compared with experimental measurements, and the method that results in the best agreement will be used to generate a database for atmospherically important transitions of water vapor. Next, the calculations will be extended to methane perturbed by nitrogen or oxygen. The research is motivated by the need for increased confidence in remote sensing measurements and a better determination of the radiative forcings of greenhouse gases. This investigation will lay the foundation for further calculations of halfwidths and line shifts for other atmospheric species.

将建立一个计算大气重要物种压力加宽半宽的理论框架，其不确定度约为5%。计算也有望产生压力引起的线移。计算受氮或氧扰动的水蒸气的半宽和线移的两种方法将与实验测量结果进行比较，结果最一致的方法将用于生成大气中重要的水蒸气转变的数据库。接下来，计算将扩展到受氮或氧干扰的甲烷。这项研究的动机是需要提高对遥感测量的信心和更好地确定温室气体的辐射强迫。这项研究将为进一步计算其他大气物种的半宽和线移奠定基础。