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  • 1. Rex, M
    et al.
    von der Gathen, P
    Harris, N R P
    Lucic, D
    Knudsen, B M
    Braathen, G O
    Reid, S J
    De Backer, H
    Claude, H
    Fabian, R
    Fast, H
    Gil, M
    Kyro, E
    Mikkelsen, I S
    Rummukainen, Markku
    SMHI, Research Department, Climate research - Rossby Centre.
    Smit, H G
    Stahelin, J
    Varotsos, C
    Zaitcev, I
    In situ measurements of stratospheric ozone depletion rates in the Arctic winter 1991/1992: A Lagrangian approach1998In: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 103, no D5, p. 5843-5853Article in journal (Refereed)
    Abstract [en]

    A Lagrangian approach has been used to assess the degree of chemically induced ozone loss in the Arctic lower stratosphere in winter 1991/1992. Trajectory calculations are used to identify air parcels probed by two ozonesondes at different points along the trajectories. A statistical analysis of the measured differences in ozone mixing ratio and the time the air parcel spent in sunlight between the measurements provides the chemical ozone loss. Initial results were first described by von der Gathen et al. [1995]. Here we present a more detailed description of the technique and a more comprehensive discussion of the results. Ozone loss rates of up to 10 ppbv per sunlit hour (or 54 ppbv per day) were found inside the polar vortex on the 475 K potential temperature surface (about 19.5 km in altitude) at the end of January. The period of rapid ozone loss coincides and slightly lags a period when temperatures were cold enough for type I polar stratospheric clouds to form. It is shown that the ozone loss occurs exclusively during the sunlit portions of the trajectories. The time evolution and vertical distribution of the ozone loss rates are discussed.

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