Climatology of Ozone, PAN, CO, and NMHC in the Free Troposphere Over the Southern North Atlantic |
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Authors: | Rainer Schmitt Andreas Volz-Thomas |
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Affiliation: | (1) Meteorologie Consult GmbH, D-61479 Glashütten, Germany;(2) ICG-2, Forschungszentrum Jülich, D-52425 Jülich, Germany |
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Abstract: | Free tropospheric measurements of ozone, peroxyacetylnitrate andprecursors (CO, NMHC) that were made within the framework of the EUROTRACsub-project TOR (Tropospheric Ozone Research) between 1990 and 1995 at theGAW station Izana, Tenerife (28°18N, 16°30W) arediscussed. The average annual cycles reveal the importance of transport fromnorthern mid-latitudes and the role of photo-chemistry. According toair-mass trajectories, which were supplied to us from AEROCE(Atmosphere/Ocean Chemistry Experiment), transport from northernmid-latitudes is associated with high precursor concentrations in winter,whereas ozone concentrations in winter are not much influenced by transportpatterns, suggesting a rather uniform distribution over the northern part ofthe Northern Hemisphere around mean value of 43 ± 5 ppb. In summer,high ozone concentrations of up to 90 ppb are often encountered duringtransport from north, while the levels of precursors are much lower than inwinter, because of photochemical destruction. Trajectories from southerlylatitudes and the Sahara usually have the lowest ozone concentrationsassociated with them. |
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Keywords: | free troposphere ozone non methane hydrocarbons peroxyacetylnitrate carbon monoxide photo chemistry North Atlantic seasonal cycle long range transport back-trajectories photochemical age |
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