The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour

Monthly lower stratosphere temperature anomalies in a layer centred about 70 hPa, from the MSU data set are analysed for the period 1979-1997. T-mode approach principal component analysis (PCA) is used in order to obtain the leading spatial anomaly patterns and their sequences of occurrence througho...

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Autores principales: Compagnucci, Rosa Hilda, Salles, María Alejandra, Canziani, Pablo Osvaldo
Publicado: 2001
Materias:
MSU
Stratosphere
Temperature
Variability
Climate change
Principal component analysis
Thermal effects
Zonal waves
Upper atmosphere
microwave radiometer
Southern Hemisphere
spatiotemporal analysis
stratosphere
temperature anomaly
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v21_n4_p439_Compagnucci
http://hdl.handle.net/20.500.12110/paper_08998418_v21_n4_p439_Compagnucci
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_08998418_v21_n4_p439_Compagnucci
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spelling paper:paper_08998418_v21_n4_p439_Compagnucci2023-06-08T15:49:36Z The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour Compagnucci, Rosa Hilda Salles, María Alejandra Canziani, Pablo Osvaldo MSU Stratosphere Temperature Variability Climate change Principal component analysis Thermal effects Zonal waves Upper atmosphere microwave radiometer Southern Hemisphere spatiotemporal analysis stratosphere temperature anomaly Monthly lower stratosphere temperature anomalies in a layer centred about 70 hPa, from the MSU data set are analysed for the period 1979-1997. T-mode approach principal component analysis (PCA) is used in order to obtain the leading spatial anomaly patterns and their sequences of occurrence throughout the period under study. Five principal components (PCs) are significantly different from the spatial distribution of noisy data. The patterns given by the PC scores represent ten typical spatial anomaly patterns: five correspond to the direct mode, that is to say anomaly fields with the same sign as the PC score patterns, and five have the opposite sign. The first three PCs represent simple spatial temperature anomaly distributions, with zonal wave 0 to wave 2 wave structures. The following significant PCs, orders four and five, display a more complex spatial behaviour, with wave 3 wave structures. The first two PC's frequency distribution in time, given by the PC loadings time series, do not show noticeable changes throughout the period analysed. The remaining three PCs show changes in their frequency of occurrence that might be associated with the negative trends in the lower stratosphere temperature, as well as to the other different features observed in the real temperature anomaly time series for the grid points in the Southern Hemisphere. The latter are studied with the PCA in the S-mode approach in the companion paper (Compagnucci et al., 2001. International Journal of Climatology 21: 419-437). Copyright © 2001 Royal Meteorological Society. Fil:Compagnucci, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Salles, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Canziani, P.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2001 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v21_n4_p439_Compagnucci http://hdl.handle.net/20.500.12110/paper_08998418_v21_n4_p439_Compagnucci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic MSU
Stratosphere
Temperature
Variability
Climate change
Principal component analysis
Thermal effects
Zonal waves
Upper atmosphere
microwave radiometer
Southern Hemisphere
spatiotemporal analysis
stratosphere
temperature anomaly
spellingShingle MSU
Stratosphere
Temperature
Variability
Climate change
Principal component analysis
Thermal effects
Zonal waves
Upper atmosphere
microwave radiometer
Southern Hemisphere
spatiotemporal analysis
stratosphere
temperature anomaly
Compagnucci, Rosa Hilda
Salles, María Alejandra
Canziani, Pablo Osvaldo
The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour
topic_facet MSU
Stratosphere
Temperature
Variability
Climate change
Principal component analysis
Thermal effects
Zonal waves
Upper atmosphere
microwave radiometer
Southern Hemisphere
spatiotemporal analysis
stratosphere
temperature anomaly
description Monthly lower stratosphere temperature anomalies in a layer centred about 70 hPa, from the MSU data set are analysed for the period 1979-1997. T-mode approach principal component analysis (PCA) is used in order to obtain the leading spatial anomaly patterns and their sequences of occurrence throughout the period under study. Five principal components (PCs) are significantly different from the spatial distribution of noisy data. The patterns given by the PC scores represent ten typical spatial anomaly patterns: five correspond to the direct mode, that is to say anomaly fields with the same sign as the PC score patterns, and five have the opposite sign. The first three PCs represent simple spatial temperature anomaly distributions, with zonal wave 0 to wave 2 wave structures. The following significant PCs, orders four and five, display a more complex spatial behaviour, with wave 3 wave structures. The first two PC's frequency distribution in time, given by the PC loadings time series, do not show noticeable changes throughout the period analysed. The remaining three PCs show changes in their frequency of occurrence that might be associated with the negative trends in the lower stratosphere temperature, as well as to the other different features observed in the real temperature anomaly time series for the grid points in the Southern Hemisphere. The latter are studied with the PCA in the S-mode approach in the companion paper (Compagnucci et al., 2001. International Journal of Climatology 21: 419-437). Copyright © 2001 Royal Meteorological Society.
author Compagnucci, Rosa Hilda
Salles, María Alejandra
Canziani, Pablo Osvaldo
author_facet Compagnucci, Rosa Hilda
Salles, María Alejandra
Canziani, Pablo Osvaldo
author_sort Compagnucci, Rosa Hilda
title The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour
title_short The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour
title_full The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour
title_fullStr The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour
title_full_unstemmed The spatial and Temporal Behaviour of the Lower Stratospheric Temperature Over the Southern Hemisphere: The MSU view. Part II: Spatial Behaviour
title_sort spatial and temporal behaviour of the lower stratospheric temperature over the southern hemisphere: the msu view. part ii: spatial behaviour
publishDate 2001
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v21_n4_p439_Compagnucci
http://hdl.handle.net/20.500.12110/paper_08998418_v21_n4_p439_Compagnucci
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