Temporal variability of lower stratosphere temperature

Inter-monthly to inter-decadal global variability of lower stratosphere temperature (LST) is studied in order to improve current knowledge on its variability and trends, as well as natural and anthropogenic influences upon it. Principal Component Analysis (PCA) with S-mode Varimax rotated PCA were u...

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Autores principales: Castañeda, M.E., Compagnucci, R.H.
Formato: JOUR
Materias:
Global
MSU
Northern Hemisphere
Principal component analysis
QBO
Southern Hemisphere
Stratosphere
Temperature
anthropogenic effect
stratosphere
temperature
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00393169_v49_n4_p573_Castaneda
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spelling todo:paper_00393169_v49_n4_p573_Castaneda2023-10-03T14:49:37Z Temporal variability of lower stratosphere temperature Castañeda, M.E. Compagnucci, R.H. Global MSU Northern Hemisphere Principal component analysis QBO Southern Hemisphere Stratosphere Temperature anthropogenic effect stratosphere temperature Inter-monthly to inter-decadal global variability of lower stratosphere temperature (LST) is studied in order to improve current knowledge on its variability and trends, as well as natural and anthropogenic influences upon it. Principal Component Analysis (PCA) with S-mode Varimax rotated PCA were used. The first seven components, which explain 70% of variance make it possible to determine homogeneous LST behaviour zones with little overlap between areas, and practically no unclassified areas. Composite time series, referred to as reference series, in the core of the subregions defined by each of the PCs, were calculated in order to obtain the temporal patterns. The equatorial-tropical zone and the subtropical area display warmings caused by the eruptions of El Chichon and Mt. Pinatubo volcanoes as well as the strong influence of the Quasi-Biennial Oscillation (QBO) which leads to equatorial warming (cooling) in the west (east) phase and cooling (warming) in subtropical latitudes. Only low latitudes show some kind of global teleconnection between hemispheres. Significant correlation with several ocean/atmosphere index time-series like ENSO, Antarctic and Arctic Oscillations (AAO, AO), Arctic Circumpolar Vortex was detected over latitudinally separate regions. Antarctic and Arctic ozone hole values were contrasted with warming and cooling features registered in mid and high latitudes in both hemispheres. The LST reference series exhibit a negative trend, commonly attributed to the increase in greenhouse gases that lead to a warming of the troposphere and a cooling of the stratosphere, in all sub regions. The highest cooling rate of -0.65°C/decade is detected in the Gobi desert, and the lowest values of -0.1 °C/decade over the NE of Canada and Greenland which indicates the great longitudinal variability that the LST trends may present. The difference with other authors is mainly due to the fact that results are based either on latitudinal averages or radiosonde data. © StudiaGeo s.r.o. 2005. Fil:Castañeda, M.E. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Global
MSU
Northern Hemisphere
Principal component analysis
QBO
Southern Hemisphere
Stratosphere
Temperature
anthropogenic effect
stratosphere
temperature
spellingShingle Global
MSU
Northern Hemisphere
Principal component analysis
QBO
Southern Hemisphere
Stratosphere
Temperature
anthropogenic effect
stratosphere
temperature
Castañeda, M.E.
Compagnucci, R.H.
Temporal variability of lower stratosphere temperature
topic_facet Global
MSU
Northern Hemisphere
Principal component analysis
QBO
Southern Hemisphere
Stratosphere
Temperature
anthropogenic effect
stratosphere
temperature
description Inter-monthly to inter-decadal global variability of lower stratosphere temperature (LST) is studied in order to improve current knowledge on its variability and trends, as well as natural and anthropogenic influences upon it. Principal Component Analysis (PCA) with S-mode Varimax rotated PCA were used. The first seven components, which explain 70% of variance make it possible to determine homogeneous LST behaviour zones with little overlap between areas, and practically no unclassified areas. Composite time series, referred to as reference series, in the core of the subregions defined by each of the PCs, were calculated in order to obtain the temporal patterns. The equatorial-tropical zone and the subtropical area display warmings caused by the eruptions of El Chichon and Mt. Pinatubo volcanoes as well as the strong influence of the Quasi-Biennial Oscillation (QBO) which leads to equatorial warming (cooling) in the west (east) phase and cooling (warming) in subtropical latitudes. Only low latitudes show some kind of global teleconnection between hemispheres. Significant correlation with several ocean/atmosphere index time-series like ENSO, Antarctic and Arctic Oscillations (AAO, AO), Arctic Circumpolar Vortex was detected over latitudinally separate regions. Antarctic and Arctic ozone hole values were contrasted with warming and cooling features registered in mid and high latitudes in both hemispheres. The LST reference series exhibit a negative trend, commonly attributed to the increase in greenhouse gases that lead to a warming of the troposphere and a cooling of the stratosphere, in all sub regions. The highest cooling rate of -0.65°C/decade is detected in the Gobi desert, and the lowest values of -0.1 °C/decade over the NE of Canada and Greenland which indicates the great longitudinal variability that the LST trends may present. The difference with other authors is mainly due to the fact that results are based either on latitudinal averages or radiosonde data. © StudiaGeo s.r.o. 2005.
format JOUR
author Castañeda, M.E.
Compagnucci, R.H.
author_facet Castañeda, M.E.
Compagnucci, R.H.
author_sort Castañeda, M.E.
title Temporal variability of lower stratosphere temperature
title_short Temporal variability of lower stratosphere temperature
title_full Temporal variability of lower stratosphere temperature
title_fullStr Temporal variability of lower stratosphere temperature
title_full_unstemmed Temporal variability of lower stratosphere temperature
title_sort temporal variability of lower stratosphere temperature
url http://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda
work_keys_str_mv AT castanedame temporalvariabilityoflowerstratospheretemperature
AT compagnuccirh temporalvariabilityoflowerstratospheretemperature
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