The influence of south Foehn on the ozone mixing ratios at the alpine site Arosa
Within 2 years of trace gas measurements performed at Arosa (Switzerland, 2030 m above sea level), enhanced ozone mixing ratios were observed during south foehn events during summer and spring (5–10 ppb above the median value). The enhancements can be traced back to ozone produced in the strongly industrialized Po basin as confirmed by various analyses. Backward trajectories clearly show advection from this region during foehn. NOy versus O3 correlation and comparison of O3 mixing ratios between Arosa and Mt. Cimone (Italy, 2165 m asl) suggest that ozone is the result of recent photochemical production (+5.6 ppb on average), either directly formed during the transport or via mixing of air processed in the Po basin boundary layer. The absence of a correlation between air parcel residence times over Europe and ozone mixing ratios at Arosa during foehn events is in contrast to a previous analysis, which suggested such correlation without reference to the origin of the air. In the case of south foehn, the continental scale influence of pollutants emission on ozone at Arosa appears to be far less important than the direct influence of the Po basin emissions. In contrast, winter time displays a different situation, with mean ozone reductions of about 4 ppb for air parcels passing the Po basin, probably caused by mixing with ozone-poor air from the Po basin boundary layer.
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Citation proposal
Mike Campana (Institute for Atmospheric and Climate Sciences, ETH Zurich,) - Yingshi Li (Institute for Atmospheric and Climate Sciences, ETH Zurich,) - Johannes Staehelin (Institute for Atmospheric and Climate Sciences, ETH Zurich,) - Andre S.H. Prevot (Paul Scherrer Institut, Laboratory of Atmospheric Chemistry,) - Paolo Bonasoni (Institute of Atmospheric Sciences and Climate (ISAC) - CNR) - Hanspeter Loetscher (Institute for Environmental Protection-KVU) - Thomas Peter (Institute for Atmospheric and Climate Sciences, ETH Zurich,) - Elsevier Science Publishing Company (2011) . The influence of south Foehn on the ozone mixing ratios at the alpine site Arosa. https://geoportal.mountaingenius.org/geonetwork/srv/api/records/14784de5-a53b-49e9-ad6b-24e30b1a2bc3 |
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- Mountains , Trace gases , Trajectories , Case study , Ozone
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- Alps , Arosa , Mt. Cimone
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- 2011-06-10T08:00:00
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"The influence of south Foehn on the ozone mixing ratios at the alpine site Arosa."
Atmospheric Environment, 39,Issue 16, 2005,Pages 2945-2955.
Campana, M., Li, Y., Staehelin, J., Prévôt ,A.S.H., Bonasoni, P., Loetscher, H.P., Peter, T.
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- mike.campana@freesurf.ch
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- Institute for Atmospheric and Climate Sciences, ETH Zurich,
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- Institute for Atmospheric and Climate Sciences, ETH Zurich,
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- Paul Scherrer Institut, Laboratory of Atmospheric Chemistry,
- andre.prevot@psi.ch
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- Institute of Atmospheric Sciences and Climate (ISAC) - CNR
- p.bonasoni@isac.cnr.it
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- Institute for Environmental Protection-KVU
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- Institute for Atmospheric and Climate Sciences, ETH Zurich,
- thomas.peter@env.ethz.ch
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- mike.campana@freesurf.ch
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- Institute for Atmospheric and Climate Sciences, ETH Zurich,
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- Institute for Atmospheric and Climate Sciences, ETH Zurich,
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- Paul Scherrer Institut, Laboratory of Atmospheric Chemistry,
- andre.prevot@psi.ch
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- Institute of Atmospheric Sciences and Climate (ISAC) - CNR
- p.bonasoni@isac.cnr.it
- Organisation name
- Institute for Environmental Protection-KVU
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- Institute for Atmospheric and Climate Sciences, ETH Zurich,
- thomas.peter@env.ethz.ch
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- Elsevier Science Publishing Company
- nlinfo@sciencedirect.com
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