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We present ozone measurements made using state-of-the-art ultraviolet photometers onboard three long-duration stratospheric balloons launched as part of the Concordiasi campaign in austral spring 2010. Ozone loss rates calculated by matching air-parcels sampled at different times and places during the polar spring are in agreement with rates previously derived from ozonesonde measurements, for the vortex-average, ranging between 2–7 ppbv (sunlit h)<sup>−1</sup> or 25–110 ppbv per day. However,doi:10.5194/acpd-14-22245-2014 fatcat:uarjx3sbhvezfcskqonvvdra5m