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Title: Nocturnal surface ozone enhancement over Portugal during winter: Influence of different atmospheric conditions
Authors: Kulkarni, Pavan
Dasari, Hari
Sharma, Ashish
Bortoli, Daniele
Salgado, Rui
Silva, Ana Maria
Keywords: NSO enhancement
WRF model
Vertical mixing
Low-level jet
Issue Date: 2016
Publisher: Elsevier
Citation: 3. Kulkarni, P. S., Dasari, H. P., Sharma A., Bortoli D., Salgado, R., Silva, A. M. (2016) Nocturnal surface ozone enhancement over Portugal during winter: Influence of different atmospheric conditions. Atmospheric Environment, doi: 10.1016/j.atmosenv.2016.09.056.
Abstract: our distinct nocturnal surface ozone (NSO) enhancement events were observed, with NSO concentration exceeding 80μg/m3, at multiple ozone (O3) monitoring stations (32 sites) in January, November and December between year 2000–2010, in Portugal. The reasonable explanation for the observed bimodal pattern of surface ozone with enhanced NSO concentration during nighttime has to be transport processes, as the surface ozone production ceases at nighttime. Simultaneous measurements of O3 at multiple stations during the study period in Portugal suggest that horizontal advection alone cannot explain the observed NSO enhancement. Thus, detailed analysis of the atmospheric conditions, simulated with the Weather Research and Forecasting (WRF) model, were performed to evaluate the atmospheric mechanisms responsible for NSO enhancement in the region. Simulations revealed that each event occurred as a result of one or the combination of different atmospheric processes such as, passage of a cold front followed by a subsidence zone; passage of a moving surface trough, with associated strong horizontal wind speed and vertical shear; combination of vertical and horizontal transport at the synoptic scale; formation of a low level jet with associated vertical mixing below the jet stream. The study confirmed that large-scale flow pattern resulting in enhanced vertical mixing in the nocturnal boundary layer, plays a key role in the NSO enhancement events, which frequently occur over Portugal during winter months.
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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