A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America

During the austral autumn of 1997, a sequence of record low ozone events with anomalous behavior occurred at subtropical latitudes to midlatitudes over southern South America, also known as the South Cone (Chile, Argentina, Uruguay, and Southern Brazil). The extreme low ozone events took place in Ma...

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Autores principales:	Canziani, Pablo Osvaldo, Compagnucci, Rosa Hilda, Bischoff, Susana A., Legnani, Walter E.
Publicado:	2002
Materias:	0341 Atmospheric Composition and Structure: Middle atmosphere - constituent transport and chemistry (3334) 3364 Meteorology and Atmospheric Dynamics: Synoptic-scale meteorology
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v107_n24_pXIII_Canziani http://hdl.handle.net/20.500.12110/paper_01480227_v107_n24_pXIII_Canziani
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_01480227_v107_n24_pXIII_Canziani
record_format	dspace
spelling	paper:paper_01480227_v107_n24_pXIII_Canziani2023-06-08T15:13:03Z A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America Canziani, Pablo Osvaldo Compagnucci, Rosa Hilda Bischoff, Susana A. Legnani, Walter E. 0341 Atmospheric Composition and Structure: Middle atmosphere - constituent transport and chemistry (3334) 3364 Meteorology and Atmospheric Dynamics: Synoptic-scale meteorology During the austral autumn of 1997, a sequence of record low ozone events with anomalous behavior occurred at subtropical latitudes to midlatitudes over southern South America, also known as the South Cone (Chile, Argentina, Uruguay, and Southern Brazil). The extreme low ozone events took place in May and early June 1997, i.e., at a time of the year when according to the climatological studies for Northern Hemisphere ozone miniholes, the most significant events would not be expected (if such studies could be simply extrapolated to the Southern Hemisphere). The first and most prominent ozone minihole, with a quasi-stationary evolution, reached values near 200 DU, i.e., a negative anomaly near 90 DU, close to 40°S. Simultaneously, extreme weather conditions were observed over the South Cone: three significant blocking events took place separated by short intervals. Both the behavior of the ozone layer over the region and the evolution of the blocking events were analyzed. As expected, the evolution of the total ozone column is shown to be linked to these perturbed weather conditions. Despite the apparently similar nature of the blocking events and of the ozone decrease during each of these events, the present study shows that the response of the UT/LS region is different in each case. The respective roles of the vertical displacement of the tropopause and the horizontal advection/divergence of ozone is discussed for the two most important events, showing how these two mechanisms combine in different ways to yield very low total ozone values. The vertical displacement of the tropopause, coupled to the size of the tropopause pressure gradient, appears to be the most efficient mechanism to modify the total ozone column amounts. Copyright 2002 by the American Geophysical Union. Fil:Canziani, P.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Compagnucci, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bischoff, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Legnani, W.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v107_n24_pXIII_Canziani http://hdl.handle.net/20.500.12110/paper_01480227_v107_n24_pXIII_Canziani
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	0341 Atmospheric Composition and Structure: Middle atmosphere - constituent transport and chemistry (3334) 3364 Meteorology and Atmospheric Dynamics: Synoptic-scale meteorology
spellingShingle	0341 Atmospheric Composition and Structure: Middle atmosphere - constituent transport and chemistry (3334) 3364 Meteorology and Atmospheric Dynamics: Synoptic-scale meteorology Canziani, Pablo Osvaldo Compagnucci, Rosa Hilda Bischoff, Susana A. Legnani, Walter E. A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America
topic_facet	0341 Atmospheric Composition and Structure: Middle atmosphere - constituent transport and chemistry (3334) 3364 Meteorology and Atmospheric Dynamics: Synoptic-scale meteorology
description	During the austral autumn of 1997, a sequence of record low ozone events with anomalous behavior occurred at subtropical latitudes to midlatitudes over southern South America, also known as the South Cone (Chile, Argentina, Uruguay, and Southern Brazil). The extreme low ozone events took place in May and early June 1997, i.e., at a time of the year when according to the climatological studies for Northern Hemisphere ozone miniholes, the most significant events would not be expected (if such studies could be simply extrapolated to the Southern Hemisphere). The first and most prominent ozone minihole, with a quasi-stationary evolution, reached values near 200 DU, i.e., a negative anomaly near 90 DU, close to 40°S. Simultaneously, extreme weather conditions were observed over the South Cone: three significant blocking events took place separated by short intervals. Both the behavior of the ozone layer over the region and the evolution of the blocking events were analyzed. As expected, the evolution of the total ozone column is shown to be linked to these perturbed weather conditions. Despite the apparently similar nature of the blocking events and of the ozone decrease during each of these events, the present study shows that the response of the UT/LS region is different in each case. The respective roles of the vertical displacement of the tropopause and the horizontal advection/divergence of ozone is discussed for the two most important events, showing how these two mechanisms combine in different ways to yield very low total ozone values. The vertical displacement of the tropopause, coupled to the size of the tropopause pressure gradient, appears to be the most efficient mechanism to modify the total ozone column amounts. Copyright 2002 by the American Geophysical Union.
author	Canziani, Pablo Osvaldo Compagnucci, Rosa Hilda Bischoff, Susana A. Legnani, Walter E.
author_facet	Canziani, Pablo Osvaldo Compagnucci, Rosa Hilda Bischoff, Susana A. Legnani, Walter E.
author_sort	Canziani, Pablo Osvaldo
title	A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America
title_short	A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America
title_full	A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America
title_fullStr	A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America
title_full_unstemmed	A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America
title_sort	study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern south america
publishDate	2002
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01480227_v107_n24_pXIII_Canziani http://hdl.handle.net/20.500.12110/paper_01480227_v107_n24_pXIII_Canziani
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A study of impacts of tropospheric synoptic processes on the genesis and evolution of extreme total ozone anomalies over southern South America

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