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Title: Upper stratospheric ozone decrease events due to a positive feedback between ozone and the ozone dissociation rate
Authors: Sonnemann, G.R.Hartogh, P.
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Issue Date: 2009
Published in: Nonlinear Processes in Geophysics Vol. 16 (2009), No. 3
Publisher: Göttingen : Copernicus
Abstract: 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.
Keywords: atmospheric chemistry; measurement method; microwave limb sounder; mixing ratio; ozone; stratosphere; temperature profile; water vapor
DDC: 550
License: CC BY 3.0 Unported
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