Characteristics of Atmospheric Wave-Induced Laminae Observed by Ozonesondes at the Southern Tip of South America
Ohyama, H.
Nagoya University
Mizuno, A.
Nagoya University
Sugita, T.
National Institute for Environmental Studies - Japan
Akiyoshi, H.
National Institute for Environmental Studies - Japan
Noguchi, K.
Nara Womens University
Wolfram, E.
CEILAP UNIDEF MINDEF CONICET
Salvador, J.
CEILAP UNIDEF MINDEF CONICET
Benitez, G. C.
Natl Meteorol Serv
Journal
Journal of Geophysical Research: Atmospheres
ISSN
2169-897X
2169-8996
Open Access
bronze
Volume
123
Start page
11811
End page
11829
Fluctuations of ozone concentrations with dimensions of a few kilometers (i.e., ozone laminae) are frequently found in ozone-sounding profiles. We used ozonesonde measurements made at the southern tip of South America to examine the relationship between ozone laminae and atmospheric waves near the edge of the polar vortex and on the leeward side of the Andes Mountains. Laminar structures are formed by vertical and horizontal displacements of isopleths due to gravity waves and by isentropic advection of vortex air filaments with low ozone concentration due to Rossby wave breaking. We extracted components of these ozone fluctuations by applying a high-pass filter to the observed ozone profiles and normalizing them to background concentrations, which were extracted with a low-pass filter. Ozone fluctuations due to displacements caused by gravity waves were individually evaluated with experimental data. We assumed that the residuals between the observed and gravity wave-induced fluctuations were Rossby waves-induced fluctuations. We found that the gravity wave-induced variability was larger in the upper troposphere than in the lower stratosphere and was a maximum in winter. Rossby wave-induced variability showed a distinct seasonal pattern in the lower stratosphere and accounted for a large portion of the observed variability. We also examined the relationship between gravity wave-induced and Rossby wave-induced ozone variability and the differences in equivalent latitudes between the sonde positions and the polar vortex edge. We found that variability was larger inside than outside the polar vortex.