Tropospheric Ozone Over Tropical Latitudes: Measurements and 1-D Steady State Chemistry Model

Desalegne, Tefera (2007) Tropospheric Ozone Over Tropical Latitudes: Measurements and 1-D Steady State Chemistry Model. Masters thesis, Addis Ababa University.

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Abstract

Atmospheric ozone is of interest not just because of the danger of ozone depletion in stratosphere but also because of its basic role in tropospheric chemistry and oxidation reactions, in controlling the temperature structure of atmosphere through absorption in the solar and terrestrial infrared radiation and air pollution along with various gases. The distribution of ozone in troposphere is resulted mainly from the interaction of various atmospheric gases, transport and chemistry and radiation processes. A full description of photochemistry ozone would be very complicated since hundreds of chemical species and reactions, many of which are interlinked, have to be included. In view of these facts, tropospheric ozone over tropics is retrieved from solar spectral radiance measurements by Fourier Transform Infrared Spectrometer (FTIR) onboard German Polar and Marine Research Vessel (Polarstern) during the 1996 expedition. 1-D steady state chemistry model is also used to determine tropospheric ozone over tropics. The retrieved tropospheric ozone distribution agrees with existing understanding that ozone is produced over tropics and transported to higher latitudes by general atmospheric circulation. The 1-D steady state chemistry model prediction is able to capture the main features of the retrieved ozone profile at altitude below 6 km. However, discrepancy between 1-D model and measurement above this altitude might be an indication of inadequacy of 1-D chemistry model.

Item Type:	Thesis (Masters)
Subjects:	Q Science > Q Science (General) Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Africana
Depositing User:	Selom Ghislain
Date Deposited:	27 Jun 2018 07:43
Last Modified:	27 Jun 2018 07:43
URI:	http://thesisbank.jhia.ac.ke/id/eprint/5967

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