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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/210

Title: IMPACT ASSESSMENT OF UNCERTAINTY OF SPECTROSCOPIC PARAMETERS ON THE ACCURACY OF TRACE GASES ABUNDANCE
Authors: Samuel, Takele
Advisors: Dr. Gizaw Mengistu
Copyright: 2007
Date Added: 9-Nov-2007
Publisher: Addis Ababa University
Abstract: We have studied sensitivity of the retrieved state vector (the atmospheric parameters) such as concentration (volume mixing ratio) profiles of targeted trace gases to uncertainty in spectroscopic parameters. Spectral line strength and pressure broadened half width of air are the spectroscopic parameters considered for this study. The atmospheric trace gases, for which the sensitives studies are performed, include source gases such H2O, N2O, CH4 and SO2, and stratospheric gases such as HNO3 and O3. The uncertainties of spectroscopic parameters considered ranges from 0.1% to 20% for spectral line strength and 0.1% to 3% for pressure broadened half width of air. The comparisons of difference of VMR of retrieved trace gases with and without perturbation of the spectroscopic parameters have shown different characteristics for different gases. The sensitivity is high at lower altitudes for source gases (H2O, N2O, CH4) while the sensitivity for stratospheric gases (HNO3 and O3) is high at the altitude of peak VMR. In the case of SO2, the impact is not noticeable, which is believed to be linked with undetectable level of SO2 under normal atmospheric conditions.
Description: A thesis submitted to the School of Graduate Studies Addis Ababa University In partial Fulfilment of the Requirements for the Degree of Master of Science in Physics
URI: http://hdl.handle.net/123456789/210
Appears in:Thesis - Physics

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