Nonstationary impacts of the southern annular mode on Southern Hemisphere climate

The temporal stability of the southern annular mode (SAM) impacts on Southern Hemisphere climate during austral spring is analyzed. Results show changes in the typical hemispheric circulation pattern associated with SAM, particularly over South America and Australia, between the 1960s-70s and 1980s-...

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Autores principales:	Silvestri, G., Vera, C.
Formato:	JOUR
Materias:	Antarctic Peninsula Anticyclonic anomalies Anticyclonic circulation Austral spring Australia Circulation patterns Moisture advection Moisture convergence Multi-decadal time scale New zealand Nonstationary Positive correlations Precipitation anomalies South America Southeastern South America Southern annular mode Southern Hemisphere Temperature anomaly Temporal stability Moisture Advection
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_08948755_v22_n22_p6142_Silvestri
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_08948755_v22_n22_p6142_Silvestri
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spelling	todo:paper_08948755_v22_n22_p6142_Silvestri2023-10-03T15:42:12Z Nonstationary impacts of the southern annular mode on Southern Hemisphere climate Silvestri, G. Vera, C. Antarctic Peninsula Anticyclonic anomalies Anticyclonic circulation Austral spring Australia Circulation patterns Moisture advection Moisture convergence Multi-decadal time scale New zealand Nonstationary Positive correlations Precipitation anomalies South America Southeastern South America Southern annular mode Southern Hemisphere Temperature anomaly Temporal stability Moisture Advection The temporal stability of the southern annular mode (SAM) impacts on Southern Hemisphere climate during austral spring is analyzed. Results show changes in the typical hemispheric circulation pattern associated with SAM, particularly over South America and Australia, between the 1960s-70s and 1980s-90s. In the first decades, the SAM positive phase is associated with an anomalous anticyclonic circulation developed in the southwestern subtropical Atlantic that enhances moisture advection and promotes precipitation increase over southeastern South America (SESA). On the other hand, during the last decades the anticyclonic anomaly induced by the SAM's positive phase covers most of southern South America and the adjacent Atlantic, producing weakened moisture convergence and decreased precipitation over SESA as well as positive temperature anomaly advection over southern South America. Some stations in the Australia-New Zealand sector and Africa exhibit significant correlations between the SAM and precipitation anomalies in both or one of the subperiods, but they do not characterize a consistent area in which the SAM signal can be certainly determined. Significant changes of SAM influence on temperature anomalies on multidecadal time scales are observed elsewhere. Particularly over the Australia-New Zealand sector, significant positive correlations during the first decades become insignificant or even negative in the later period, whereas changes of opposite sign occur in the Antarctic Peninsula between both subperiods. © 2009 American Meteorological Society. Fil:Silvestri, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vera, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08948755_v22_n22_p6142_Silvestri
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Antarctic Peninsula Anticyclonic anomalies Anticyclonic circulation Austral spring Australia Circulation patterns Moisture advection Moisture convergence Multi-decadal time scale New zealand Nonstationary Positive correlations Precipitation anomalies South America Southeastern South America Southern annular mode Southern Hemisphere Temperature anomaly Temporal stability Moisture Advection
spellingShingle	Antarctic Peninsula Anticyclonic anomalies Anticyclonic circulation Austral spring Australia Circulation patterns Moisture advection Moisture convergence Multi-decadal time scale New zealand Nonstationary Positive correlations Precipitation anomalies South America Southeastern South America Southern annular mode Southern Hemisphere Temperature anomaly Temporal stability Moisture Advection Silvestri, G. Vera, C. Nonstationary impacts of the southern annular mode on Southern Hemisphere climate
topic_facet	Antarctic Peninsula Anticyclonic anomalies Anticyclonic circulation Austral spring Australia Circulation patterns Moisture advection Moisture convergence Multi-decadal time scale New zealand Nonstationary Positive correlations Precipitation anomalies South America Southeastern South America Southern annular mode Southern Hemisphere Temperature anomaly Temporal stability Moisture Advection
description	The temporal stability of the southern annular mode (SAM) impacts on Southern Hemisphere climate during austral spring is analyzed. Results show changes in the typical hemispheric circulation pattern associated with SAM, particularly over South America and Australia, between the 1960s-70s and 1980s-90s. In the first decades, the SAM positive phase is associated with an anomalous anticyclonic circulation developed in the southwestern subtropical Atlantic that enhances moisture advection and promotes precipitation increase over southeastern South America (SESA). On the other hand, during the last decades the anticyclonic anomaly induced by the SAM's positive phase covers most of southern South America and the adjacent Atlantic, producing weakened moisture convergence and decreased precipitation over SESA as well as positive temperature anomaly advection over southern South America. Some stations in the Australia-New Zealand sector and Africa exhibit significant correlations between the SAM and precipitation anomalies in both or one of the subperiods, but they do not characterize a consistent area in which the SAM signal can be certainly determined. Significant changes of SAM influence on temperature anomalies on multidecadal time scales are observed elsewhere. Particularly over the Australia-New Zealand sector, significant positive correlations during the first decades become insignificant or even negative in the later period, whereas changes of opposite sign occur in the Antarctic Peninsula between both subperiods. © 2009 American Meteorological Society.
format	JOUR
author	Silvestri, G. Vera, C.
author_facet	Silvestri, G. Vera, C.
author_sort	Silvestri, G.
title	Nonstationary impacts of the southern annular mode on Southern Hemisphere climate
title_short	Nonstationary impacts of the southern annular mode on Southern Hemisphere climate
title_full	Nonstationary impacts of the southern annular mode on Southern Hemisphere climate
title_fullStr	Nonstationary impacts of the southern annular mode on Southern Hemisphere climate
title_full_unstemmed	Nonstationary impacts of the southern annular mode on Southern Hemisphere climate
title_sort	nonstationary impacts of the southern annular mode on southern hemisphere climate
url	http://hdl.handle.net/20.500.12110/paper_08948755_v22_n22_p6142_Silvestri
work_keys_str_mv	AT silvestrig nonstationaryimpactsofthesouthernannularmodeonsouthernhemisphereclimate AT verac nonstationaryimpactsofthesouthernannularmodeonsouthernhemisphereclimate
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Nonstationary impacts of the southern annular mode on Southern Hemisphere climate

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