Two-year (1996/1997) ozone DIAL measurement over Dumont d’Urville (Antarctica).

Santecesario, V. and Stefanutti, L. and Morandi, M. and Guzzi, D. and Mackenzie, A. Robert (1999) Two-year (1996/1997) ozone DIAL measurement over Dumont d’Urville (Antarctica). Geophysical Research Letters, 26 (4). pp. 463-466. ISSN 0094-8276

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Two years of ozone measurements (1996, 1997), sorted according to the analysed potential vorticity over Dumont d’Urville (66 °S), are presented. Subsidence in the vortex was observed by tracing the descent of the ozone maximum. Chemical depletion was also observed. In springtime, the ozone mixing ratio was reduced by a factor 10 on isentropes between about 400 K and 475 K. Using the observations of descent and depletion, it is shown that, at the latitude of Dumont d’Urville, chemical depletion starts close to mid-winter. Depletion starts earlier at higher altitudes (above 450 K) than at lower altitudes (below 450 K). The earlier presence of Polar Stratospheric Clouds (PSCs) at higher altitudes than at lower altitudes is a likely reason. The mid-winter maximum in Antarctic total ozone columns [Roscoe et al., 1997] is then due to the integrated effect of these phase-shifted maxima on the various isentropic surfaces

Item Type:
Journal Article
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Geophysical Research Letters
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?? geophysicsgeneral earth and planetary sciencesearth and planetary sciences(all)ge environmental sciences ??
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05 Feb 2009 13:32
Last Modified:
16 Jul 2024 08:21