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Communication Dans Un Congrès Année : 2012

Twenty years of ozonesonde measurements at La Reunion Island Instrumental evolution and tropospheric ozone trends between 1992 and 2012.

Résumé

Since1992 ozonesonde measurements have been performed at La Reunion Island located at 21°S and 55.5°E in the southwest Indian Ocean. In 1998, this site joined the Southern Hemisphere Additional OZonesondes (SHADOZ) program allowing to improve the frequency of measurements to once a week. Since the start of ozonesonde measurement at La Reunion Island, some instrumental changes have occurred, such as the cathode solution concentration, and the meteorological radiosonde system from Vaisala to Modem. The influence of this last modification on data has been analyzed with several dual flights. In November 2011, in collaboration with the Finnish Meteorological Institute (FMI), simultaneous measurements have been made combining the Modem, 2 types of Vaisala sondes and the Cryogenic Frost point Hygrometer (CFH). Tropospheric ozone trends have been estimated. Considering the whole tropospheric column, a positive trend has been observed. Trend calculations have also been investigated, separating the troposphere into different layers and according to seasons. The strongest trends are observed in the upper troposphere, and during austral winter. The purpose of this presentation is to describe the instrumentation, its evolution and the impact of instrumental changes, to discuss intercomparisons between different sondes and to present long-term trends characteristics.
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Dates et versions

hal-00965506 , version 1 (25-03-2014)

Identifiants

  • HAL Id : hal-00965506 , version 1

Citer

Françoise Posny, Jean-Luc Baray, Jean-Marc Metzger, Rigel Kivi, Gaëlle Clain. Twenty years of ozonesonde measurements at La Reunion Island Instrumental evolution and tropospheric ozone trends between 1992 and 2012.. Quadiennal Ozone Symposium, Aug 2012, Toronto, Canada. pp.ID:5933. ⟨hal-00965506⟩
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