The Study Of Ground Ozone Concentration
Levels: A Functional Analysis Approach Based
On Principal Components Analysis
Author(s)
L. M. Caligiuri, G. D. Costanzo & A. Reda
Abstract
Ground O3 represents one of the most dangerous environmental pollutants. It is
generated through complex physical and chemical processes in the atmosphere
and combustion processes in the troposphere involving a non-linear relationship
between ozone, other pollutants (in particular its precursor as NO or NO2) and
meteorological variables (primarily solar radiation and temperature). Because of
this complexity the determination of O3 concentration levels based on a
deterministic approach is generally not possible or is limited to a very few
particular cases. In this work we have considered an innovative approach based
on the application of Functional Principal Components Analysis (FPCA) to
experimental data consisting in time series of the concentration of ground O3,
NOx, solar irradiation and temperature, in order to extract more or less manifest
features characterizing the behaviour of the variables considered, to be used for a
better understanding of ground ozone dynamics.
1 Introduction
Ground O3 is not produced by anthropic sources, but derives from reactions
involving other pollutants (mainly NOx and volatile organic compounds (VOC))
called \“precursors”, under the action of solar irradiation and temperature. The O3
generation process starts with NO2 photo dissociation and is based on the
following reactions:
NO2 + h ν →ΝΟ +Ο
Ο +Ο2 →Ο3
Keywords
Related Book
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