Study of ozone distribution over the south-eastern France (ESCOMPTE campaign): discrimination between ozone tendencies due to chemistry and to transport |
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Authors: | J Arteta S Cautenet |
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Institution: | (1) Laboratoire de Météorologie Physique, OPGC-CNRS and Université Blaise Pascal, Campus des Cézeaux, 24, Av des Landais, Aubière, 63170, France |
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Abstract: | Ozone tendencies due to chemistry and transport are calculated by a mesoscale model using a fine horizontal resolution (3 km × 3 km),
over South-Eastern France. Over that region where the anthropogenic emissions are very strong, ozone pollution is highlighted
during two intensive observations periods of the ESCOMPTE campaign, when the sea breeze penetrates far into the Durance and
Rhone valleys and the up-slope breezes are developed. From a fine analysis of time series of ozone concentration at different
ground stations along these valleys and from numerical results, it is possible to discriminate the tendency due to chemistry
from the tendency due to dynamical processes. We can distinguish both processes, either local chemical production/loss or
dynamical increase/decrease (transport, deposition) on maps of ozone budget according to the meteorological conditions. In
particular, we show that the variations due to transport can be have the same order of magnitude than those due to chemistry,
reaching 20 ppbv h−1, whereas those due to chemistry are around 30 ppbv h−1. |
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Keywords: | Ozone peak Ozone tendency Sea breeze Channeling in the valleys Chemistry transport modeling |
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