Monitoring of ozone in a marine environment in Tenerife (Canary Islands) |
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| Institution: | 1. Instituto de Ciencias de La Tierra Jaume Almera, CSIC, C/Lluis Solé i Sabarı́s, s/n, 08028 Barcelona, Spain;2. Facultad de Fı́sicas, Universidad de La Laguna, Avda. Astrofı́sico Francisco Sánchez s/n 38071, La Laguna, Tenerife, Canary Islands, Spain;1. Delft Center for Systems and Control, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands;2. Department of Computer Science, University of Oxford, Wolfson Building, Parks Road, Oxford, OX1 3QD, United Kingdom;1. Environmental Radioactivity Laboratory (LaboRA), University of the Balearic Islands, 07122 Palma de Mallorca, Spain;1. Centro Nacional de Aceleradores (Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, Junta de Andalucía), Thomas Alva Edison 7, 41092 Seville, Spain;2. Laboratory of Ion Beam Physics, ETH Zurich, Otto Stern Weg 5, CH-8093 Zurich, Switzerland;3. Department of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, ACT 2601, Australia;1. Physics Dept., Faculty of Science, Yarmouk University, Irbid 211-63, Jordan;2. Physics Dept., Faculty of Science, Islamic University in Madinah, Al-Madinah, P.O. Box 170, Saudi Arabia;3. Basic Sciences Department, College of Science and Health Professions, King Saud bin Abdulaziz University for Health Sciences, Riyadh, P.O.Box 3660, Saudi Arabia;1. Department of Public Health and Maternal and Child Health, Complutense University of Madrid. Plaza Ramón y Cajal, S/n., 28040, Madrid, Spain;2. CIBER of Epidemiology and Public Health (CIBERESP). Monforte de Lemos, 3-5. 28029, Madrid, Spain;3. Department of Preventive Medicine and Public Health, University of Granada, Avda. de La Investigación 11. 18016, Granada, Spain;4. Cancer and Environmental Epidemiology Unit, Department of Epidemiology of Chronic Diseases, National Center for Epidemiology, Carlos III Institute of Health, Calle Sinesio Delgado, 4. 28029, Madrid, Spain;5. National School of Public Health. Carlos III Institute of Health, Calle Sinesio Delgado, 4. 28029, Madrid, Spain;6. Health Research Institute of the Hospital Clínico San Carlos (IdISSC), Calle Del Profesor Martín Lagos. 28040, Madrid, Spain |
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| Abstract: | In the Aguere Valley (in the oceanic boundary layer at Tenerife, 28°N, 16°W, 580 m a.s.l.) the ozone levels were monitored for ambient air quality assessment. Although precursors are emitted in this area, the strong correlation between ozone levels and wind velocity indicates that ozone is transported into the valley from the ocean. The inland ozone supply along the valley is induced by an orographic channelling effect of the northern oceanic air masses. The highest ozone concentrations are mostly recorded during the nocturnal stage under the influence of fresh oceanic air masses, and during high wind speed events. The seasonal cycle is characterised by elevated ozone mixing ratios in the spring (nighttime levels >45 ppbv) and low mixing ratios in the summer (nighttime levels in the range 20–35 ppbv). Back-trajectory analysis shows that the ozone monitored in the Aguere Valley is associated with long-range transport processes. High ozone events in the spring are associated with transport from upper tropospheric levels, both over the North Atlantic-high latitudes (>45°N) and Europe. This downward transport was observed in the western edge of upper tropospheric cyclones, which suggests that the upper tropospheric/low stratospheric ozone sources play a significant role. In summer, ozone is mainly transported from the North Atlantic-high latitudes (>45°N) and from mid- to low-tropospheric levels. In autumn and winter, the high ozone concentrations are transported from sources located a few km above the North Atlantic-high latitudes (>45°N) and over Europe. The Central-North Atlantic (<45°N) and North Africa are not significant sources of ozone. The high spring and lower summer ozone events in the Aguere Valley agree with other North Atlantic ozone observation in the oceanic boundary layer. However, this behaviour contrasts with the high ozone events frequently recorded at Izaña BAPMoN station (located in the free troposphere in Tenerife) during the summer, which have been attributed in the literature to downward transport from upper levels. An intensification of the inversion layer that separates the oceanic boundary layer of the free troposphere during the summer in Canary Islands is interpreted as the cause of this different behaviour between ozone in the Aguere Valley and Izaña BAPMoN station. |
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