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  • 1
    Electronic Resource
    Electronic Resource
    A Study of Ozone Laminae Using Diabatic Trajectories, Contour Advection and Photochemical Trajectory Model Simulations. (1998)
    Springer
    Journal of atmospheric chemistry 30 (1998), S. 187-207 
    Details
    ISSN: 1573-0662
    Keywords: Ozone laminae ; mid-latitudes ; ozone depletion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract In this paper, we show that the rate of ozone loss in both polar and mid-latitudes, derived from ozonesonde and satellite data, has almost the same vertical distribution (although opposite sense) to that of ozone laminae abundance. Ozone laminae appear in the lower stratosphere soon after the polar vortex is established in autumn, increase in number throughout the winter and reach a maximum abundance in late winter or spring. We indicate a possible coupling between mid-winter, sudden stratospheric warmings (when the vortex is weakened or disrupted) and the abundance of ozone laminae using a 23-year record of ozonesonde data from the World Ozone Data Center in Canada combined with monthly-mean January polar temperatures at 30 hPa. Results are presented from an experiment conducted during the winter of 1994/95, in phase II of the Second European Stratospheric And Mid-latitude Experiment (SESAME), in which 93 ozone-enhanced laminae of polar origin observed by ozonesondes at different time and locations are linked by diabatic trajectories, enabling them to be probed twice or more. It is shown that, in general, ozone concentrations inside laminae fall progressively with time, mixing irreversibly with mid-latitude air on time-scales of a few weeks. A particular set of laminae which advected across Europe during mid February 1995 are examined in detail. These laminae were observed almost simultaneously at seven ozonesonde stations, providing information on their spatial scales. The development of these laminae has been modelled using the Contour Advection algorithm of Norton (1994), adding support to the concept that many laminae are extrusions of vortex air. Finally, a photochemical trajectory model is used to show that, if the air in the laminae is chemically activated, it will impact on mid-latitude ozone concentrations. An estimate is made of the potential number of ozone molecules lost each winter via this mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005836212979
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical Ozone Loss in the Arctic Winter 1994/95 as Determined by the Match Technique (1999)
    Springer
    Journal of atmospheric chemistry 32 (1999), S. 35-59 
    Details
    ISSN: 1573-0662
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The chemically induced ozone loss inside the Arctic vortex during the winter 1994/95 has been quantified by coordinated launches of over 1000 ozonesondes from 35 stations within the Match 94/95 campaign. Trajectory calculations, which allow diabatic heating or cooling, were used to trigger the balloon launches so that the ozone concentrations in a large number of air parcels are each measured twice a few days apart. The difference in ozone concentration is calculated for each pair and is interpreted as a change caused by chemistry. The data analysis has been carried out for January to March between 370 K and 600 K potential temperature. Ozone loss along these trajectories occurred exclusively during sunlit periods, and the periods of ozone loss coincided with, but slightly lagged, periods where stratospheric temperatures were low enough for polar stratospheric clouds to exist. Two clearly separated periods of ozone loss show up. Ozone loss rates first peaked in late January with a maximum value of 53 ppbv per day (1.6 % per day) at 475 K and faster losses higher up. Then, in mid-March ozone loss rates at 475 K reached 34 ppbv per day (1.3 % per day), faster losses were observed lower down and no ozone loss was found above 480 K during that period. The ozone loss in hypothetical air parcels with average diabetic descent rates has been integrated to give an accumulated loss through the winter. The most severe depletion of 2.0 ppmv (60 %) took place in air that was at 515 K on 1 January and at 450 K on 20 March. Vertical integration over the levels from 370 K to 600 K gives a column loss rate, which reached a maximum value of 2.7 Dobson Units per day in mid-March. The accumulated column loss between 1 January and 31 March was found to be 127 DU (∼36 %).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006093826861
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  • 3
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    Chemical ozone loss in the Arctic winter 1994/95 as determined by the Match technique (1999)
    In:  EPIC3Journal of Atmospheric Chemistry, 32(1), pp. 35-59
    Details
    Publication Date: 2019-07-16
    Description: The chemically induced ozone loss inside the Arctic vortex during the winter 1994/95 has beenquantified by coordinated launches of over 1000 ozonesondes from 35 stations within the Match94/95 campaign. Trajectory calculations, which allow diabatic heating or cooling, were used totrigger the balloon launches so that the ozone concentrations in a large number of air parcels areeach measured twice a few days apart. The difference in ozone concentration is calculated foreach pair and is interpreted as a change caused by chemistry. The data analysis has been carriedout far January to March between 370 K and 600 K potential temperature. Ozone loss along thesetrajectories occurred exclusively during sunlit periods, and the periods of ozone loss coincidedwith, but slightly lagged, periods where stratospheric temperatures were low enough for polarstratospheric clouds to exist. Two clearly separated periods of ozone loss show up. Ozone lossrates first peaked in late January with a maximum value of 53 ppbv per day (1.6 % per day) at475 K and faster losses higher up. Then, in mid-March ozone loss rates at 475 K reached 34 ppbvper day (1.3 % per day), faster losses were observed lower down and no ozone loss was foundabove 480 K during that period. The ozone loss in hypothetical air parcels with average diabaticdescent rates has been integrated to give an accumulated loss through the winter. The most severedepletion of 2.0 ppmv (60 %) took place in air that was at 515 K on 1 January and at 450 K on20 March. Vertical integration over the levels from 370 K to 600 K gives a column lass rate,which reached a maximum value of 2.7 Dobson Units per day in mid-March. The accumulatedcolumn loss between 1 January and 31 March was found to be 127 DU (similar to 36 %).
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    A study of ozone laminae using diabatic trajectories, contour advection and photochemical trajectory model simulations (1998)
    In:  EPIC3Journal of Atmospheric Chemistry, 30(1), pp. 187-207
    Details
    Publication Date: 2019-07-16
    Description: In this paper, we show that the rate of ozone loss in both polar and mid-latitudes, derived from ozonesonde and satellite data, has almost the same vertical distribution (although opposite sense) to that of ozone laminae abundance. Ozone laminae appear in the lower stratosphere soon after the polar vortex is established in autumn, increase in number throughout the winter and reach a maximum abundance in late winter or spring. We indicate a possible coupling between mid-winter, sudden stratospheric warmings (when the vortex is weakened or disrupted) and the abundance of ozone laminae using a 23-year record of ozonesonde data from the World Ozone Data Center in Canada combined with monthly-mean January polar temperatures at 30 hPa.Results are presented from an experiment conducted during the winter of 1994/95, in phase II of the Second European Stratospheric And Mid-latitude Experiment (SESAME), in which 93 ozone-enhanced laminae of polar origin observed by ozonesondes at different time and locations are linked by diabatic trajectories, enabling them to be probed twice or more. It is shown that, in general, ozone concentrations inside laminae fall progressively with time, mixing irreversibly with mid-latitude air on time-scales of a few weeks.A particular set of laminae which advected across Europe during mid February 1995 are examined in detail. These laminae were observed almost simultaneously at seven ozonesonde stations, providing information on their spatial scales. The development of these laminae has been modelled using the Contour Advection algorithm of Norton (1994), adding support to the concept that many laminae are extrusions of vortex air. Finally, a photochemical trajectory model is used to show that, if the air in the laminae is chemically activated, it will impact on mid-latitude ozone concentrations. An estimate is made of the potential number of ozone molecules lost each winter via this mechanism.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    The evolution of ozone laminae using the Match approach (1996)
    In:  EPIC3Proceedings 3rd European Symposium on Polar Stratospheric Ozone, Schliersee, 1995, (J. A. Pyle, N. R. P. Harris, and G. T. Amanatidis, eds), Air pollution research report 56, pp. 590-594, ISBN: 92-827-5722-6
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 6
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    Chemical ozone loss in the Arctic winters 1991/92 and 1994/95 (Match) (1996)
    In:  EPIC3Polar stratospheric ozone, Proceedings 3rd European Symposium on Polar Stratospheric Ozone, Schliersee(J. A. Pyle, N. R. P. Harris, and G. T. Amanatidis eds) Air pollution research report 56, 1995, pp. 586-589, ISBN: 92-827-5722-6, 586-
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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