ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-2-507-2002 Observations of large stratospheric ozone variations over Mendoza, Argentina Puliafito C. 1 2 Enrique Puliafito S. 1 2 Hartmann G. K. 3 Universidad de Mendoza – Instituto para el Estudio del Medio Ambiente, Mendoza, Argentina CONICET, Perito Moreno 2397, (5500) Godoy Cruz, Mendoza, Argentina Max Planck Institut für Aeronomie, Max Planck Str. 2, D-37191 Katlenburg-Lindau, Germany 02 05 2002 2 3 507 523 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/2/507/2002/acpd-2-507-2002.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/2/507/2002/acpd-2-507-2002.pdf

Since November 1993 up to present from Benegas Station, Mendoza, Argentina (site of IEMA Institute) and from high locations in the Andes region, ground based radiometric measurements of stratospheric ozone and tropospheric water vapor have been achieved. Ozone measurements are performed by using a radiometer-spectrometer tuned at 142 GHz and tropospheric water vapor by means of a 92 GHz radiometer. In this paper two case studies of large stratospheric ozone variations due to dynamical processes will be presented. These processes are very likely associated to gravity waves, generated by airflow over the Andes Mountains, or due to Zonda wind effect.