High resolution spectroscopic study of atmospheric trace gases with climate research application

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dc.contributor.authorHashemi, Robab
dc.contributor.authorUniversity of Lethbridge. Faculty of Arts and Science
dc.contributor.supervisorBillinghurst, Brant
dc.date.accessioned2019-06-20T17:09:21Z
dc.date.available2019-06-20T17:09:21Z
dc.date.issued2018
dc.degree.levelPh.Den_US
dc.description.abstractThe presented research was conducted to collect, and analyze the laboratory spectroscopic data together with theoretical calculations of the line shape parameters for the HITRAN (High Resolution Transmission) molecular spectroscopic database. The most updated version of this database is HITRAN2016 \cite{HITRAN16}, and this research has contributed to this database by adding improved laboratory results to it. There is a demand for accurate retrieval of concentration values for carbon dioxide and methane (with accuracy better than 0.3 percent) which requires accurate line shape parameters. These line shape parameters are invaluable for modelling and interpreting spectra of Earth and planetary atmospheres. It is necessary to measure advanced line shape parameters such as the speed-dependence (to explain the impact of the speed of colliding molecules) and line mixing (where there is interference of neighbouring transitions) for all the transitions in the databases. The molecules of interest for the present research are atmospheric trace gases; acetylene (C$_2$H$_2$), methane (CH$_4$) and carbon monoxide (CO). For C$_2$H$_2$, the goal is to determine the fundamental Boltzmann constant based on a line shape analysis of $\nu_1+\nu_3$ band recorded using a tunable diode laser. The next focus of the thesis is the examination of different line profiles on the absorption spectra of the CO-CO$_2$ in the $2-0$ band and CH$_4$-air in 2.3 $\mu m$. A standard multispectrum non-linear least squares fitting technique is used to measure line width and line shift coefficients, and their temperature dependencies considering the effect of speed dependence and line mixing.en_US
dc.description.sponsorshipThe Natural Sciences and Engineering Research Council of Canada, the NSERC CREATE AMETHYST, the Alberta Innovates Technology Futures (AITF), the SGS Dean's Scholarship, Department of Physics and Astronomy, and SGS University of Lethbridge.en_US
dc.embargoNoen_US
dc.identifier.urihttps://hdl.handle.net/10133/5422
dc.language.isoen_USen_US
dc.proquest.subject0605en_US
dc.proquest.subject0606en_US
dc.proquestyesYesen_US
dc.publisherLethbridge, Alta. : Universtiy of Lethbridge, Department of Physics and Astronomyen_US
dc.publisher.departmentDepartment of Physics and Astronomyen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectSpectrum analysisen_US
dc.subjectMethane -- Spectraen_US
dc.subjectAcetylene -- Sprectraen_US
dc.subjectCarbon monoxide -- Spectraen_US
dc.subjectHigh resolution spectroscopyen_US
dc.subjectRemote sensingen_US
dc.subjectDissertations, Academicen_US
dc.subjectline shape studyen_US
dc.subjectspeed dependent effecten_US
dc.subjectVoigt profileen_US
dc.titleHigh resolution spectroscopic study of atmospheric trace gases with climate research applicationen_US
dc.typeThesisen_US
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