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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3628

Title: SPECTROSCOPIC MEASUREMENTS OF TROPOSPHERIC HCN AND C2H6 OVER ADDIS ABABA
Authors: AMBACHEW, ABEJE
Advisors: Dr.Gizaw Mengistu
Keywords: HCN
TROPOSPHERIC
C2H6
Copyright: Jun-2011
Date Added: 6-Nov-2012
Publisher: AAU
Abstract: The atmospheric concentrations of HCN and C2H6 are important indicators of tropospheric pollution and transport because they are primarily emitted from biomass burning and anthropogenic sources. Tropospheric column amounts and mixing ratios of C2H6 and HCN were retrieved from ground-based infrared solar spectra using a vertical pro le retrieval algorithm (PROFFIT). The spectra were recorded with high spectral resolution Fourier transform infrared (FTIR) spectrometer at Addis Ababa (9.010 N, 38.760 E and 2.45 km asl), Ethiopia from May 2009 to February 2011. The selected microwindows are found to be good with a maximum residual error of less than 0.1% for HCN and less than 3.5% for C2H6 retrievals. We found that the degrees of freedom for HCN is 2 and 1.5 for C2H6 with a total statistical error 38.78% and 17.74% and a total systematic error 37.33% and 12.04% respectively. HCN is more sensitive in the upper atmosphere while C2H6 is sensitive in the lower atmosphere. The total column amount of HCN ranges from 9.83 1018 to 6.39 1019 while of C2H6 from 3.60 1019 to 1.70 1020 molecules/m2. The maximum volume mixing ratio for both gases was found in March. xi
Description: A Thesis SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN PHYSICS
URI: http://hdl.handle.net/123456789/3628
Appears in:Thesis - Physics

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