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Sensitivity of ozone production derived from field measurements in the Italian Po basin

2002; American Geophysical Union; Volume: 107; Issue: D22 Linguagem: Inglês

10.1029/2000jd000119

2156-2202

Axel Thielmann, Andrê S. H. Prévôt, J. Staehelin,

Atmospheric and Environmental Gas Dynamics

Ozone, nitric oxides, and total reactive nitrogen, measured at two stations in the vicinity of Milan, Italy, are used to infer information on the reactive organic gas (ROG) versus NO x sensitivity of ozone production. At the rural station, ozone production per NO x consumed is less efficient when the advected air masses originate from Milan. This lower efficiency is indicative of ROG‐sensitive ozone production. Furthermore, the indicator variables H 2 O 2 /NO z , HCHO/NO y , and O 3 /NO z are applied to both sets of data. The data set with lower ozone production efficiency consistently shows lower indicator values. These findings corroborate the interpretation that ozone production within the Po basin has a tendency to be NO x sensitive and that ROG‐sensitive ozone production is only possible within the Milan urban plume. Important links to model calculations for the domain are highlighted.