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Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2018

Phenomenology of summer ozone episodes over the Madrid Metropolitan Area, central Spain

Gotzon Gangoiti
  • Fonction : Auteur
Hong Lee
  • Fonction : Auteur
Heeram Eun
  • Fonction : Auteur
Yonghee Park
  • Fonction : Auteur
Enrique Mantilla
  • Fonction : Auteur
Miguel Escudero
  • Fonction : Auteur
Gloria Titos
  • Fonction : Auteur
Lucio Alonso
  • Fonction : Auteur
Nicolas Marchand
Juan Moreta
  • Fonction : Auteur
M. Arantxa Revuelta
  • Fonction : Auteur
Pedro Salvador
  • Fonction : Auteur
Begoña Artíñano
  • Fonction : Auteur
Saúl García dos Santos
  • Fonction : Auteur
Mónica Anguas
  • Fonction : Auteur
Alberto Notario
  • Fonction : Auteur
Alfonso Saiz-Lopez
Millán Millán
  • Fonction : Auteur
Kang-Ho Ahn
  • Fonction : Auteur

Résumé

Various studies have reported that the photochem-ical nucleation of new ultrafine particles (UFPs) in urban environments within high insolation regions occurs simultaneously with high ground ozone (O 3) levels. In this work, we evaluate the atmospheric dynamics leading to summer O 3 episodes in the Madrid air basin (central Iberia) by means of measuring a 3-D distribution of concentrations for both pollutants. To this end, we obtained vertical profiles (up to 1200 m above ground level) using tethered balloons and miniaturised instrumentation at a suburban site located to the SW of the Madrid Metropolitan Area (MMA), the Majada-honda site (MJDH), in July 2016. Simultaneously, measurements of an extensive number of air quality and meteorological parameters were carried out at three supersites across the MMA. Furthermore, data from O 3 soundings and daily radio soundings were also used to interpret atmospheric dynamics. The results demonstrate the concatenation of venting and accumulation episodes, with relative lows (venting) and peaks (accumulation) in O 3 surface levels. Regardless of the episode type, the fumigation of high-altitude O 3 (arising from a variety of origins) contributes the major proportion of surface O 3 concentrations. Accumulation episodes Published by Copernicus Publications on behalf of the European Geosciences Union. 6512 X. Querol et al.: Summer ozone episodes over the Madrid Metropolitan Area are characterised by a relatively thinner planetary boundary layer (< 1500 m at midday, lower in altitude than the oro-graphic features), light synoptic winds, and the development of mountain breezes along the slopes of the Guadarrama Mountain Range (located W and NW of the MMA, with a maximum elevation of > 2400 m a.s.l.). This orographic– meteorological setting causes the vertical recirculation of air masses and enrichment of O 3 in the lower tropospheric layers. When the highly polluted urban plume from Madrid is affected by these dynamics, the highest O x (O 3 + NO 2) concentrations are recorded in the MMA. Vertical O 3 profiles during venting episodes, with strong synoptic winds and a deepening of the planetary boundary layer reaching > 2000 m a.s.l., were characterised by an upward gradient in O 3 levels, whereas a reverse situation with O 3 concentration maxima at lower levels was found during the accumulation episodes due to local and/or regional production. The two contributions to O 3 surface levels (fumigation from high-altitude strata, a high O 3 background, and/or regional production) require very different approaches for policy actions. In contrast to O 3 vertical top-down transfer, UFPs are formed in the planetary boundary layer (PBL) and are transferred upwards progressively with the increase in PBL growth.
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Dates et versions

hal-01788173 , version 1 (11-05-2018)

Identifiants

Citer

Xavier Querol, Andrés Alastuey, Gotzon Gangoiti, Noemí Perez, Hong Lee, et al.. Phenomenology of summer ozone episodes over the Madrid Metropolitan Area, central Spain. Atmospheric Chemistry and Physics, 2018, 18 (9), pp.6511-6533. ⟨10.5194/acp-18-6511-2018⟩. ⟨hal-01788173⟩
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