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Modeling the January 2006 low ozone episode over Western Europe and comparison with ozone sonde data

dc.contributor.authorMangold, A.
dc.contributor.authorGrooß, J.U.
dc.contributor.authorRuhnke, R.
dc.contributor.authorDe Backer, H.
dc.contributor.authorKirner, O.
dc.contributor.authorRuhnke, R.
dc.contributor.authorMüller, R.
dc.coverage.temporal2009
dc.date2009
dc.date.accessioned2016-03-07T16:17:32Z
dc.date.accessioned2021-12-09T09:55:48Z
dc.date.available2016-03-07T16:17:32Z
dc.date.available2021-12-09T09:55:48Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/9184
dc.descriptionTotal column and stratospheric ozone levels at mid-latitudes often reveal strong fluctuations on time scales of days caused by dynamic processes. In some cases the total ozone column is distinctly reduced below climatological values. Here, a very low total ozone episode around 19 January 2006 over Western Europe is investigated when the observed total ozone column over Uccle (BE), measured by a Brewer spectrophotometer, reached a daily minimum of 200 DU, the lowest recorded value at this station. In order to investigate the mechanisms leading to the ozone minimum, the present study used data from (i) six ozone sounding stations in Western and Middle Europe, (ii) ECMWF meteorological fields, (iii) a simulation of the CLaMS model for January 2006, (iv) a multi-year run of the chemistry transport model KASIMA, and (v) a six-year run of the climate chemistry model ECHAM5/MESSy1. The ozone decrease at different heights was quantified and it was determined to what extent different transport mechanisms, and instantaneous, insitu chemical ozone depletion contributed to the event. All three models reproduced the evolution and formation of the event. The ozone column decrease between 2=300 and 750 K was strongest at Uccle (BE) and De Bilt (NL) with 108 and 103 DU, respectively, and somewhat lower at Hohenpeissenberg (DE), Payerne (CH), Prague (CZ) and Lerwick (UK) with 85, 84, 83 and 74 DU, respectively. This analysis demonstrated that mainly the displacement of the ozone depleted polar vortex contributed to the ozone column decrease. Advection of ozone-poor low-latitude air masses was important in the UTLS region. The vertical displacement of isentropes connected with divergence of air out of the column was found to be of minor importance compared to the horizontal transport processes. Severe low total ozone episodes seem to occur when the mentioned mechanisms are superimposed. Instantaneous, in-situ chemical ozone depletion accounted for only 2± 1% of the overall total ozone decrease at the sounding stations.
dc.languageeng
dc.publisherIRM
dc.publisherKMI
dc.publisherRMI
dc.relation.ispartofseriesAtmos. Chem. and Phys., 9, http://www.atmos-chem-phys.net/9/6429/2009/acp-9-6429-2009.pdf
dc.titleModeling the January 2006 low ozone episode over Western Europe and comparison with ozone sonde data
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceGeneral Public
dc.audienceScientific
dc.subject.freeNatural sciences
dc.subject.freeEarth and related Environmental sciences
dc.source.issueAtmos. Chem. and Phys., 9, http://www.atmos-chem-phys.net/9/6429/2009/acp-9-6429-2009.pdf
dc.source.page6429-6451
Orfeo.peerreviewedYes


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