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|Title: ||TROPOSPHERIC OZONE OVER TROPICAL LATITUDES: MEASUREMENTS AND 1-D STEADY STATE CHEMISTRY MODEL|
|Authors: ||Desalegne, Tefera|
|Advisors: ||Dr. Gizaw Mengistu|
|Copyright: ||Jul-2007 |
|Date Added: ||4-May-2012 |
|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 interac-
tion 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 under-
standing 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.|
|Appears in:||Thesis - Physics|
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