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The DOMINO (Diel Oxidant Mechanisms in relationto Nitrogen Oxides) campaign was carried out from21 November to 8 December 2008 at the El Arenosillo station(SW of Spain) in a coastal-rural environment. The mainweather conditions are analysed using local meteorologicalvariables, meteorological soundings and synoptic maps, aswell as back trajectories of the air masses using the HYSPLIT(Hybrid Single-Particle Lagrangian Integrated TrajectoryModel) model and a high spatial resolution of meteorologicalfields. Measurements of the main meteorological parameterswere collected both from the surface and from a talltower. A detailed land use analysis was performed on a 80 kmscale showing the main types of vegetation and land use.Also the main anthropogenic atmospheric emission sources –both industrial-urban from Huelva and from the urban Sevillearea – are shown. A study to identify air mass origins andtheir variation with height was carried out. In this intensivecampaign, air masses coming from different areas with differentemission sources were observed: from the NW, witha highly industrial-urban character; continental flows fromnortherly directions; from the NE, with a pathway startingover the Seville metropolitan area and then continuing overthe Doñana National Park; and maritime air masses comingfrom the Atlantic Ocean. To study the chemistry in thefour atmospheric scenarios identified, gas -phase measurementsof primary and secondary species such as ozone, NO,NO2 and SO2, biogenic and anthropogenic VOCs (volatileorganic compounds) like benzene and isoprene, as well astotal particle concentration and chemical composition of theaerosols are compared and discussed. The highest levels fortotal particle concentration, NO, NO2, SO2, benzene, PM10,PM2.5 and chemical elements such as As or Cu were foundunder flows associated with industrial-urban emissions fromthe Huelva–Portugal sector which are transported to the sitebefore significant removal by chemical or deposition mechanismcan occur. The air masses from the north were affectedmainly by crustal elements and biogenic sources, the latterbeing exemplified by the biogenic species such as isoprene,particularly in the first part of the campaign. The urban airfrom the Seville area, before arriving at El Arenosillo, traversedthe Doñana National Park and therefore was affectedby industrial-urban and biogenic emissions. This aged air parcel can transport low levels of NOx, total particle concentrationand SO2 as well as ozone and isoprene. Marine airmasses from the Atlantic Ocean influence El Arenosillo frequently.Under these conditions, the lowest levels of almostall the species – with the exception of ozone levels associatedto long-range transport – were measured

Meteorology during the DOMINO campaign and its connection with trace gases and aerosols