Line Shape for Collision Systems Important in Earth&#39;s, Planetary, and Exoplanet Atmospheres

GSTDTAP

项目编号	1622676
	Line Shape for Collision Systems Important in Earth's, Planetary, and Exoplanet Atmospheres
	Robert Gamache
主持机构	University of Massachusetts Lowell
项目开始年	2016
	2016-08-01
项目结束日期	2018-07-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	290304(USD)
国家	美国
语种	英语
英文摘要	Infrared and solar radiation absorbed by atmospheric water and trace gases drives atmospheric chemistry and climate. Individual species absorb radiation in unique spectral bands and windows and the amounts vary with pressure and temperature for each molecule. In order to accurately compute the energy absorbed by our atmosphere and to use remote sensing to detect these molecules accurate line by line spectral absorption parameters including their variation with environmental parameters is needed. This research uses fundamental physics to construct accurate line shape parameters of key atmospheric species that will be used in atmospheric radiation and remote sensing retrieval models to advance our knowledge of atmospheric chemistry. This research will develop a unified theoretical framework to calculate pressure-broadened half-widths and pressure-induced line shifts, their velocity and temperature dependences for gases important in the Earth's atmosphere. The improved formalism will go beyond the current Voigt profile approximation to enhance remote sensing retrievals and line-by-line computations of radiative forcing of climate. The research will develop the new Hartmann-Tran profiles that require velocity dependent line shape parameters that will be estimated from thousands of ro-vibronic transitions that will be computed using ab initio and Modified Complex Robert-Bonamy codes. It will target H2O, CO2, O3 and CH4 line broadening in collision with N2, O2, and self-collisions at atmospherically relevant temperatures and pressures. Specifically, the effects of line coupling and mixing on half-widths will be rigorously treated and calibrated using available observations. In addition to advancing the U.S. community HITRAN database focused studies will enrich remote sensing retrievals and radiative forcing by trace gases to advance atmospheric chemistry and climate.
来源学科分类	Geosciences - Atmospheric and Geospace Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/69963
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Robert Gamache.Line Shape for Collision Systems Important in Earth's, Planetary, and Exoplanet Atmospheres.2016.