Author: Robert H. Hunt
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
High Resolution Infrared Absorption Spectra of Various Trace Gases Present in the Upper Atmosphere of the Earth
Scientific and Technical Aerospace Reports
Energy Research Abstracts
High Resolution Spectroscopic Study of Atmospheric Trace Gases with Climate Research Application
Author: Robab Hashemi
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The 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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The 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.
Handbook of High Resolution Infrared Laboratory Spectra of Atmospheric Interest (1981)
Author: Aaron Goldman
Publisher: CRC Press
ISBN: 1351363050
Category : Science
Languages : en
Pages : 266
Book Description
The handbook presents spectra to be utilized for the detection and measurement of new constituents in the earth's atmosphere and to obtain data for common minor species with large gas amounts in the absorption cell (such as CH/sub 4/ and N/sub 2/O). These results can be applied in the identification of absorption features in atmospheric spectra determined over long atmospheric paths. The spectra were recorded with Fourier Transform Spectrometers which are more precise than grating spectrometers. Each molecule spectrum was plotted on two scales: a condensed scale covering the range from 75 to 300/cm in one frame, and an expanded view covering 20 or 10/cm per frame. Each plot contains the name of the molecule, chemical formula, the gas pressure, cell length, and estimated resolution of the spectrum.
Publisher: CRC Press
ISBN: 1351363050
Category : Science
Languages : en
Pages : 266
Book Description
The handbook presents spectra to be utilized for the detection and measurement of new constituents in the earth's atmosphere and to obtain data for common minor species with large gas amounts in the absorption cell (such as CH/sub 4/ and N/sub 2/O). These results can be applied in the identification of absorption features in atmospheric spectra determined over long atmospheric paths. The spectra were recorded with Fourier Transform Spectrometers which are more precise than grating spectrometers. Each molecule spectrum was plotted on two scales: a condensed scale covering the range from 75 to 300/cm in one frame, and an expanded view covering 20 or 10/cm per frame. Each plot contains the name of the molecule, chemical formula, the gas pressure, cell length, and estimated resolution of the spectrum.
High Resolution Infrared Spectroscopy of Carbon Dioxide and Nitrous Oxide at Elevated Temperatures
Author: Mark P. Esplin
Publisher:
ISBN:
Category : Atmospheric carbon dioxide
Languages : en
Pages : 72
Book Description
Although both Carbon Dioxide and Nitrous Oxide are minor constituents of the terrestrial atmosphere, they play leading roles in several current atmospheric problems. Both CO2 and N2O are greenhouse gases, and while it is known that the atmospheric concentrations of both gases is increasing, the impact of these trends on global temperature is not yet adequately understood. In addition to being a greenhouse gas, N2O plays an indirect part in ozone chemistry. Heating a molecule makes possible the observations of molecular transitions originating from highly excited rotation-vibration states. Heating a molecule makes possible the observations of molecular transitions originating from highly excited rotation-vibration states. These observations can then be used to characterize the shape of the molecular potential function at increasing distances from the minimum of the potential function. The infrared spectra of linear molecules like CO2 and N2O are composed of vibration bands made up of a number of nearly equally spaced rotation lines. A Fourier Spectrometer is ideally suited to the study of high temperature gases since it meets both of these needs by providing high resolution over a wide spectral region.
Publisher:
ISBN:
Category : Atmospheric carbon dioxide
Languages : en
Pages : 72
Book Description
Although both Carbon Dioxide and Nitrous Oxide are minor constituents of the terrestrial atmosphere, they play leading roles in several current atmospheric problems. Both CO2 and N2O are greenhouse gases, and while it is known that the atmospheric concentrations of both gases is increasing, the impact of these trends on global temperature is not yet adequately understood. In addition to being a greenhouse gas, N2O plays an indirect part in ozone chemistry. Heating a molecule makes possible the observations of molecular transitions originating from highly excited rotation-vibration states. Heating a molecule makes possible the observations of molecular transitions originating from highly excited rotation-vibration states. These observations can then be used to characterize the shape of the molecular potential function at increasing distances from the minimum of the potential function. The infrared spectra of linear molecules like CO2 and N2O are composed of vibration bands made up of a number of nearly equally spaced rotation lines. A Fourier Spectrometer is ideally suited to the study of high temperature gases since it meets both of these needs by providing high resolution over a wide spectral region.
Collaborative Study of Analysis of High Resolution Infrared Atmospheric Spectra Between NASA Langley Research Center and the University of Denver
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721192632
Category :
Languages : en
Pages : 28
Book Description
The Langley-D.U. collaboration on the analysis of high resolution infrared atmospheric spectra covered a number of important studies of trace gases identification and quantification from field spectra, and spectral line parameters analysis. The collaborative work included: Quantification and monitoring of trace gases from ground-based spectra available from various locations and seasons and from balloon flights. Studies toward identification and quantification of isotopic species, mostly oxygen and Sulfur isotopes. Search for new species on the available spectra. Update of spectroscopic line parameters, by combining laboratory and atmospheric spectra with theoretical spectroscopy methods. Study of trends of atmosphere trace constituents. Algorithms developments, retrievals intercomparisons and automatization of the analysis of NDSC spectra, for both column amounts and vertical profiles. Goldman, Aaron Langley Research Center
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721192632
Category :
Languages : en
Pages : 28
Book Description
The Langley-D.U. collaboration on the analysis of high resolution infrared atmospheric spectra covered a number of important studies of trace gases identification and quantification from field spectra, and spectral line parameters analysis. The collaborative work included: Quantification and monitoring of trace gases from ground-based spectra available from various locations and seasons and from balloon flights. Studies toward identification and quantification of isotopic species, mostly oxygen and Sulfur isotopes. Search for new species on the available spectra. Update of spectroscopic line parameters, by combining laboratory and atmospheric spectra with theoretical spectroscopy methods. Study of trends of atmosphere trace constituents. Algorithms developments, retrievals intercomparisons and automatization of the analysis of NDSC spectra, for both column amounts and vertical profiles. Goldman, Aaron Langley Research Center
The Earth Observer
Author:
Publisher:
ISBN:
Category : Artificial satellites in earth sciences
Languages : en
Pages : 274
Book Description
Publisher:
ISBN:
Category : Artificial satellites in earth sciences
Languages : en
Pages : 274
Book Description
Monthly Catalogue, United States Public Documents
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 868
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 868
Book Description
Earth Resources
Author:
Publisher:
ISBN:
Category : Astronautics in earth sciences
Languages : en
Pages : 758
Book Description
Publisher:
ISBN:
Category : Astronautics in earth sciences
Languages : en
Pages : 758
Book Description