Spectroscopic Measurements Of Tropospheric Hcn And C2h6 Over Addis Ababa

The atmospheric concentrations of HCN and C2H6 are important indicators of troposphericrnpollution and transport because they are primarily emitted from biomass burningrnand anthropogenic sources. Tropospheric column amounts and mixing ratios of C2H6rnand HCN were retrieved from ground-based infrared solar spectra using a vertical pro lernretrieval algorithm (PROFFIT). The spectra were recorded with high spectral resolutionrnFourier transform infrared (FTIR) spectrometer at Addis Ababa (9.010 N, 38.760 E andrn2.45 km asl), Ethiopia from May 2009 to February 2011. The selected microwindows arernfound to be good with a maximum residual error of less than 0.1% for HCN and less thanrn3.5% for C2H6 retrievals. We found that the degrees of freedom for HCN is 2 and 1.5rnfor C2H6 with a total statistical error 38.78% and 17.74% and a total systematic errorrn37.33% and 12.04% respectively. HCN is more sensitive in the upper atmosphere whilernC2H6 is sensitive in the lower atmosphere. The total column amount of HCN ranges fromrn9.83 1018 to 6.39 1019 while of C2H6 from 3.60 1019 to 1.70 1020 molecules/m2. Thernmaximum volume mixing ratio for both gases was found in March

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