| Abstract |
The split of gases in the atmosphere under the effect of light is the force of chemical
reactions that changes the chemical constitution of the atmosphere.
The stratospheric ozone is really important for the preservation of life on Earth as it
protects us from the ultraviolet radiation. On the contrary, the tropospheric ozone is
characterized as a pollutant and its dissociation in excited atom O1D (singlet oxygen),
(which would react with vapour) leads to the production of the radical OH, one of the
most effective chemical compounds in the atmosphere.
Additionally, the photodissociation of NO2 is the main source of individual oxygen
O3P (triplet oxygen) that is necessary for the production of ozone in the troposphere.
The investigation of the photolysis rates of those two chemical compounds is of
great importance concerning the photochemistry of the troposphere.
The aim of this project is:
- The study of the photodissociation rates of O3 and NO2 at the Finokalia station
considering the measurements that took place during the years 2002-2006.
- The aerosol effect at the photodisociation of O3 and NO2 using a radiation
model and the differences of the dissociation levels with and without aerosols.
Chapter 1: The interaction of solar radiation with the constituents of the atmosphere
and its distribution within the atmosphere.
Chapter 2: Tropospheric chemistry/production and loss of ozone.
Chapter 3: The factors that affect the photolysis rates of O3and NO2.
Chapter 4: Description of the radiation model and the instruments that were used at
the Finokalia station.
Chapter 5: The effect of the existence of the aerosols at the distribution of the solar
radiation throughout the atmosphere.
Chapter 6: Digrams presenting the results and discussion of the conclusions.
In conclusion, in this study, it is shown that the photolysis rate of O3 is 40%
decreased due to aerosols while the effect on the photodissociation of NO2 can reach
up to 20%. Also, it was found that during summer the photolysis rate of NO2 can be
enhanced up to 2.5% because of multiple scattering.
Moreover, it was really interesting that using 4π sr for JO3 and JNO2
calculations instead of 2π sr (used at the station of Finokalia), the levels of the
photolysis rates are 12% (in average) higher for O3 and 15% for NO2.
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Επίδραση των αερολυμάτων στη φωτοδιάσπαση του όζοντος στην Ανατολική Μεσόγειο
