Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale

We explore the occurrence of intraseasonal summer heat waves in southeastern Patagonia (SEPG, 46°-52°S; 65°-70°W) since the late 19th century by means of the Twentieth Century Reanalysis version 2 (20CRv2). In total, we identify 201 cases for 1872-2010 using criteria of intensity and persistence. In...

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Autores principales:	Vera, Carolina Susana, Cerne, Silvia Bibiana
Publicado:	2016
Materias:	Heat waves Intraseasonal variability Oceania Patagonia South America Temperature Warm season Climate change Warm seasons Climatology air temperature atmospheric circulation extreme event nineteenth century regional climate seasonal variation summer teleconnection timescale twentieth century warming Australia New Zealand Pacific Ocean Pacific Ocean (South) Tasman Sea
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v36_n3_p1359_JacquesCoper http://hdl.handle.net/20.500.12110/paper_08998418_v36_n3_p1359_JacquesCoper
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08998418_v36_n3_p1359_JacquesCoper
record_format	dspace
spelling	paper:paper_08998418_v36_n3_p1359_JacquesCoper2023-06-08T15:49:46Z Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale Vera, Carolina Susana Cerne, Silvia Bibiana Heat waves Intraseasonal variability Oceania Patagonia South America Temperature Warm season Climate change Temperature Heat waves Intraseasonal variability Oceania Patagonia South America Warm seasons Climatology air temperature atmospheric circulation extreme event nineteenth century regional climate seasonal variation summer teleconnection timescale twentieth century warming Australia New Zealand Pacific Ocean Pacific Ocean (South) Patagonia Tasman Sea We explore the occurrence of intraseasonal summer heat waves in southeastern Patagonia (SEPG, 46°-52°S; 65°-70°W) since the late 19th century by means of the Twentieth Century Reanalysis version 2 (20CRv2). In total, we identify 201 cases for 1872-2010 using criteria of intensity and persistence. In SEPG, the corresponding intraseasonal temperature signals are centred around the first day of each cluster of days fulfilling those conditions (named day 0). The mean warm deviation lasts for approximately 2weeks and exhibits a mean temperature peak of 4.3°C on day 0 (the warmest day in the mean signal). In a regional context, the mean temperature perturbation associated with these heat waves affects a broad area on both sides of the Andes. The warming in SEPG is caused by temperature advection and enhanced radiative heating, following a high pressure system over southern South America (SSA). This atmospheric perturbation is embedded in a wave-train-like pattern along the South Pacific. As part of this pattern, a cyclonic anomaly progresses eastward over the Tasman Sea in Oceania, moving from southeastern Australia (day -6, causing a dry anomaly there) over New Zealand (day -3, inducing a wet anomaly on its Southern Island). The anomalous circulation triggered by the wave train leads thus to a teleconnection between SSA and Oceania, documented in a previous work for the interannual scale. Two thirds of the heat wave events are linked to enhanced ascent in the South Atlantic Convergence Zone (SACZ) and around one third of the events within 1957-2010 are associated with extreme absolute maximum temperatures observed at a station-based record from SEPG. Finally, possible spatial modulations of the wave train pattern at the interannual and interdecadal timescales are discussed. © 2016 Royal Meteorological Society. Fil:Vera, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerne, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v36_n3_p1359_JacquesCoper http://hdl.handle.net/20.500.12110/paper_08998418_v36_n3_p1359_JacquesCoper
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Heat waves Intraseasonal variability Oceania Patagonia South America Temperature Warm season Climate change Temperature Heat waves Intraseasonal variability Oceania Patagonia South America Warm seasons Climatology air temperature atmospheric circulation extreme event nineteenth century regional climate seasonal variation summer teleconnection timescale twentieth century warming Australia New Zealand Pacific Ocean Pacific Ocean (South) Patagonia Tasman Sea
spellingShingle	Heat waves Intraseasonal variability Oceania Patagonia South America Temperature Warm season Climate change Temperature Heat waves Intraseasonal variability Oceania Patagonia South America Warm seasons Climatology air temperature atmospheric circulation extreme event nineteenth century regional climate seasonal variation summer teleconnection timescale twentieth century warming Australia New Zealand Pacific Ocean Pacific Ocean (South) Patagonia Tasman Sea Vera, Carolina Susana Cerne, Silvia Bibiana Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale
topic_facet	Heat waves Intraseasonal variability Oceania Patagonia South America Temperature Warm season Climate change Temperature Heat waves Intraseasonal variability Oceania Patagonia South America Warm seasons Climatology air temperature atmospheric circulation extreme event nineteenth century regional climate seasonal variation summer teleconnection timescale twentieth century warming Australia New Zealand Pacific Ocean Pacific Ocean (South) Patagonia Tasman Sea
description	We explore the occurrence of intraseasonal summer heat waves in southeastern Patagonia (SEPG, 46°-52°S; 65°-70°W) since the late 19th century by means of the Twentieth Century Reanalysis version 2 (20CRv2). In total, we identify 201 cases for 1872-2010 using criteria of intensity and persistence. In SEPG, the corresponding intraseasonal temperature signals are centred around the first day of each cluster of days fulfilling those conditions (named day 0). The mean warm deviation lasts for approximately 2weeks and exhibits a mean temperature peak of 4.3°C on day 0 (the warmest day in the mean signal). In a regional context, the mean temperature perturbation associated with these heat waves affects a broad area on both sides of the Andes. The warming in SEPG is caused by temperature advection and enhanced radiative heating, following a high pressure system over southern South America (SSA). This atmospheric perturbation is embedded in a wave-train-like pattern along the South Pacific. As part of this pattern, a cyclonic anomaly progresses eastward over the Tasman Sea in Oceania, moving from southeastern Australia (day -6, causing a dry anomaly there) over New Zealand (day -3, inducing a wet anomaly on its Southern Island). The anomalous circulation triggered by the wave train leads thus to a teleconnection between SSA and Oceania, documented in a previous work for the interannual scale. Two thirds of the heat wave events are linked to enhanced ascent in the South Atlantic Convergence Zone (SACZ) and around one third of the events within 1957-2010 are associated with extreme absolute maximum temperatures observed at a station-based record from SEPG. Finally, possible spatial modulations of the wave train pattern at the interannual and interdecadal timescales are discussed. © 2016 Royal Meteorological Society.
author	Vera, Carolina Susana Cerne, Silvia Bibiana
author_facet	Vera, Carolina Susana Cerne, Silvia Bibiana
author_sort	Vera, Carolina Susana
title	Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale
title_short	Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale
title_full	Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale
title_fullStr	Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale
title_full_unstemmed	Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale
title_sort	summer heat waves in southeastern patagonia: an analysis of the intraseasonal timescale
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v36_n3_p1359_JacquesCoper http://hdl.handle.net/20.500.12110/paper_08998418_v36_n3_p1359_JacquesCoper
work_keys_str_mv	AT veracarolinasusana summerheatwavesinsoutheasternpatagoniaananalysisoftheintraseasonaltimescale AT cernesilviabibiana summerheatwavesinsoutheasternpatagoniaananalysisoftheintraseasonaltimescale
_version_	1768544509166092288

Summer heat waves in southeastern Patagonia: An analysis of the intraseasonal timescale

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