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DDC: 550 × Has files: Yes × Type: article × Publisher: Göttingen : Copernicus × Subject: atmospheric chemistry ×

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    Upper stratospheric ozone decrease events due to a positive feedback between ozone and the ozone dissociation rate
    (Göttingen : Copernicus, 2009) Sonnemann, G.R.; Hartogh, P.
    Ozone measurements taken with a ground based microwave instrument at Lindau (51.66° N, 10.13° E) over some years showed strong ozone decrease events within the stratopause region, particularly during the winter half-year. These events are characterized by a marked drop of the ozone mixing ratio from two to three ppmv to less than half a ppmv in extreme cases. Simultaneous water vapor measurements at the same place, also carried out by a microwave instrument, showed a strong increase of its mixing ratio and the temperature was also enhanced during these episodes. The theoretical analysis brought evidence that these events result from a positive feedback in the complex radiatively-chemical system between the ozone column density and the ozone dissociation rate.