Artículo
Abstract:
An objective classification of sequence patterns of 1000 hPa and 500 hPa geopotential heights associated with cold surges over Central Argentina was carried out. Polar Outbreaks during wintertime in Central Argentina (May to September) cause important damage to the regional agriculture and sometimes affect the energy supply. In particular, the consumption of natural gas is strongly dependent on significant temperature descents. The rotated Principal Components Analysis (PCA) was used to obtain the basic patterns of sequence of 1000 hPa and 500 hPa geopotential heights. The winter cold surges during the 1979-1993 period occur in seven patterns at 1000 hPa and three modes at 500 hPa. The combination of both levels shows three typical situations related to cold surges over Central Argentina. The most classic pattern shows an important ridge west of the Pacific coast of the continent at its upper level and a postfrontal anticyclone at its lower level producing cold air advection over Central Argentina. The other two patterns present a long wave trough at upper levels affecting the continent, one of them with the postfrontal anticyclone moving over middle and low latitudes, and the other with the migratory anticyclone affecting lower latitudes.
Registro:
| Documento: | Artículo |
| Título: | Sequence patterns of 1000 hPa and 500 hPa geopotential height fields associated with cold surges over Central Argentina |
| Autor: | Escobar, G.; Compagnucci, R.; Bischoff, S. |
| Filiación: | Depto. de Ciencias de la Atmosfera, Universidad de Buenos Aires, Buenos Aires 1428, Argentina |
| Palabras clave: | Blockings; Cold surges; Principal components; atmospheric blocking; cold front; geopotential; Argentina; South America |
| Año: | 2004 |
| Volumen: | 17 |
| Número: | 2 |
| Página de inicio: | 69 |
| Página de fin: | 89 |
| Título revista: | Atmosfera |
| Título revista abreviado: | Atmosfera |
| ISSN: | 01876236 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01876236_v17_n2_p69_Escobar |
Referencias:
- Cattell, R., The scientific use of factor analysis (1978) Behavior and Life Sciences, p. 617. , Plenum, New York and London
- Compagnucci, R., Araneo, D., Canziani, P., Principal sequence pattern analysis: A new approach to classifying the evolution of atmospheric systems (2001) Int. Journal. Clim., 21, pp. 197-217
- Elliot, R., Smith, T., A study of the effects of large blocking highs on the general circulation in the Northern Hemisphere westerlies (1949) J. Met., 6 (2), pp. 67-85
- Escobar, G., Bischoff, S., Meteorological situations associated with significant temperature falls in Buenos Aires: An application to the daily consumption of residential natural gas (1999) Meteorol. Appl., 6, pp. 253-260
- Escobar, G., Bischoff, S., Criterio de detección de irrupciones de aire frío en la región central de Argentina a partir de descensos interdiurnos de temperatura (2001) Meteorológica, 26 (1-2), pp. 57-68
- Fortune, M., Kousky, V., Two severe freezes in Brazil: Precursors and synoptic evolution (1983) Mon. Wea. Rev., 111, pp. 181-196
- Garreaud, R., Cold air incursions over subtropical South America: Mean structure and dynamics (2000) Mon. Wea. Rev., 128, pp. 2544-2559
- Green, P., (1978) Analysing Multivariate Data, p. 519. , The Dryden Press. Illinois, U.S.A
- Harman, H., (1976) Modern Factor Analysis, , The University of Chicago Press, Chicago, IL
- Krishnamurty, T., Tewari, M., Chakraborty, D., Downstream amplification: A possible precursor to Mayor freeze events over Southeastern Brazil (1999) Wea. and Forecasting, 14, pp. 242-271
- Marengo, J., Cornejo, A., Satyamurty, P., Nobre, C., Cold surges in tropical and extratropical South America: The strong event in June 1994 (1997) Mon. Wea. Rev., 125, pp. 2759-2786
- Nocera, J., Bosart, L., Knight, D., A climatology and compositing study of cold surges in South America (2000) Sixth International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 378-379. , 3-7 April 2000, Santiago, Chile
- Richman, M., Rotation of principal components (1986) J. of Climatology, 6, pp. 293-335
- Richman, M., Angel, J., Gong, X., Determination of dimensionality in eingenanalysis (1992) Fifth International Meeting on Statistical Climatology, pp. 229-235. , 22-26 June 1992, Toronto, Canada
- Scian, B., Situación sinóptica asociada a las temperaturas extremas observadas en junio de 1967 (1970) Meteorológica, 1, pp. 22-37
- Sinclair, M., A climatology of anticyclones and blocking for Southern Hemisphere (1996) Mon. Wea. Rev., 124, pp. 245-263
- Trenberth, K., Mo, K., Blocking in the Southern Hemisphere (1985) Mon. Wea. Rev., 113, pp. 3-21
Citas:
---------- APA ----------
Escobar, G., Compagnucci, R. & Bischoff, S. (2004) . Sequence patterns of 1000 hPa and 500 hPa geopotential height fields associated with cold surges over Central Argentina. Atmosfera, 17(2), 69-89.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01876236_v17_n2_p69_Escobar [ ]
---------- CHICAGO ----------
Escobar, G., Compagnucci, R., Bischoff, S. "Sequence patterns of 1000 hPa and 500 hPa geopotential height fields associated with cold surges over Central Argentina" . Atmosfera 17, no. 2 (2004) : 69-89.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01876236_v17_n2_p69_Escobar [ ]
---------- MLA ----------
Escobar, G., Compagnucci, R., Bischoff, S. "Sequence patterns of 1000 hPa and 500 hPa geopotential height fields associated with cold surges over Central Argentina" . Atmosfera, vol. 17, no. 2, 2004, pp. 69-89.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01876236_v17_n2_p69_Escobar [ ]
---------- VANCOUVER ----------
Escobar, G., Compagnucci, R., Bischoff, S. Sequence patterns of 1000 hPa and 500 hPa geopotential height fields associated with cold surges over Central Argentina. Atmosfera. 2004;17(2):69-89.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01876236_v17_n2_p69_Escobar [ ]
