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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ftunibueairesbd:paper:paper_00393169_v49_n4_p573_Castaneda 2023-05-15T13:50:11+02:00 Temporal variability of lower stratosphere temperature Castañeda, María Elizabeth Compagnucci, Rosa Hilda 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v49_n4_p573_Castaneda https://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v49_n4_p573_Castaneda http://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda Global MSU Northern Hemisphere Principal component analysis QBO Southern Hemisphere Stratosphere Temperature anthropogenic effect 2005 ftunibueairesbd https://doi.org/20.500.12110/paper_00393169_v49_n4_p573_Castaneda 2023-02-16T02:23:33Z 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. ... Other/Unknown Material Antarc* Antarctic Arctic Greenland Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Arctic Canada Greenland |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Global MSU Northern Hemisphere Principal component analysis QBO Southern Hemisphere Stratosphere Temperature anthropogenic effect |
spellingShingle |
Global MSU Northern Hemisphere Principal component analysis QBO Southern Hemisphere Stratosphere Temperature anthropogenic effect Castañeda, María Elizabeth Compagnucci, Rosa Hilda Temporal variability of lower stratosphere temperature |
topic_facet |
Global MSU Northern Hemisphere Principal component analysis QBO Southern Hemisphere Stratosphere Temperature anthropogenic effect |
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. Fil:Castañeda, M.E. ... |
author |
Castañeda, María Elizabeth Compagnucci, Rosa Hilda |
author_facet |
Castañeda, María Elizabeth Compagnucci, Rosa Hilda |
author_sort |
Castañeda, María Elizabeth |
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 |
publishDate |
2005 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v49_n4_p573_Castaneda https://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda |
geographic |
Antarctic Arctic Canada Greenland |
geographic_facet |
Antarctic Arctic Canada Greenland |
genre |
Antarc* Antarctic Arctic Greenland |
genre_facet |
Antarc* Antarctic Arctic Greenland |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00393169_v49_n4_p573_Castaneda http://hdl.handle.net/20.500.12110/paper_00393169_v49_n4_p573_Castaneda |
op_doi |
https://doi.org/20.500.12110/paper_00393169_v49_n4_p573_Castaneda |
_version_ |
1766253178201833472 |