Artículo
Abstract:
The connection between the tropical convection over South America and rainfall in subtropical Argentina is studied using outgoing longwave radiation (OLR) measurements obtained from the scanning radiometer aboard the polar orbiting NOM operational satellites and rainfall measurements of 32 selected Argentine stations for the period 1975-1991. The mean annual rainfall cycle in subtropical Argentina can be described by the composition of the first three eigenvectors. The first eigenvector explains 59% of the variance having a strong influence in north-eastern Argentina and little variability during the year. The second, explaining 19% of the variance, represents the summer rainfall with maximum variability in the northwest part of the country. The third eigenvector explains 4% of the variance and is related to the semiannual cycle observed in the southeast of subtropical Argentina. The tropical convection may be related to rainfall in subtropical Argentina. It influences the vertical movements by compensatory subsidence and the higher humidity at low levels accompanying the convection, which can be advected towards Argentina. Also, the position of the mean centres of tropical convection is related to the latitude of the subtropical jet and of the tropospheric circulation. As a consequence, it influences the possible advection of humidity from the Atlantic Ocean. Different parameters are used to detect the influence of the onset of the summer monsoon on the end of the dry winter over almost all subtropical Argentina. Significant correlation is evident when rainfall in September in subtropical Argentina is correlated with the onset monsoon date anomaly. When the convection is advanced (delayed) from the climatic value, there are positive (negative) rainfall anomalies in the south-eastern region of subtropical Argentina.
Registro:
| Documento: | Artículo |
| Título: | The relationship between tropical convection in South America and the end of the dry period in subtropical Argentina |
| Autor: | Gonzalez, M.; Barros, V. |
| Filiación: | Department of Atmospheric Sciences, University of Buenos Aires, Buenos Aires, Argentina Department of Atmospheric Sciences, University of Buenos Aires, Ciudad University, 1428 Buenos Aires, Argentina |
| Palabras clave: | Annual outgoing longwave radiation; Anomalies; Argentina; Correlation; Factor analysis; Principal component analysis; Rainfall; South America, subtropical; Tropical convection; atmospheric convection; dry season; longwave radiation; precipitation (climatology); statistical analysis; subtropical region; tropical environment; Argentina; South America |
| Año: | 1998 |
| Volumen: | 18 |
| Número: | 15 |
| Página de inicio: | 1669 |
| Página de fin: | 1685 |
| DOI: | http://dx.doi.org/10.1002/(SICI)1097-0088(199812)18:15<1669::AID-JOC340>3.0.CO;2-1 |
| Título revista: | International Journal of Climatology |
| Título revista abreviado: | Int. J. Climatol. |
| ISSN: | 08998418 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08998418_v18_n15_p1669_Gonzalez |
Referencias:
- Aceituno, P., On the functioning of the Southern Oscillation in the South American sector. Part 1: Surface climate (1988) Mon. Wea. Rev., 116, pp. 505-524
- Arkin, P.A., Ardanuy, P.E., Estimating climatic scale precipitation from space: A review (1989) J. Climate, 1, pp. 1229-1238
- Canziani, O., Fortelay, J.A., Troha, A., Estacionalidad de las precipitaciones en el territorio continental Argentino (1992) Geoacta, 19, pp. 21-36
- Doyle, M.E., Los máximos de viento de 200 y 300 Hpa en el sector Sudamerica no y Atlántico adyacente (1994) Semi Nario de Licenciatura en Ciencias de la Atmósfera, 224p. , Departamento de Ciencias de la Atmósfera, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires
- Gonzalez, M., Barros, V., Aspectos estadísticos del ciclo anual de precipitación y sus anomalies en Argentina subtropical (1996) Meteorologica, 21 (1-2), pp. 15-26
- Green, P., (1978) Analysing Multivariate Data, , Dryden Press, Chapter 8
- Gruber, A., Krueger, A.F., The status of the NOM outgoing long wave radiation data set (1984) Bull Am Meteorol Soc., 65, pp. 958-962
- (1998) Global Water Vapor Project, , Langley DMC, NASA, Langley Research Centre, Hampton, USA
- Hastenrath, S., Interannual variability and annual cycle: Mechanisms of circulation and climates in the tropical America sector (1984) Mon. Wea. Rev., 112, pp. 1097-1107
- Heddinghaus, T., Krueger, A., Annual and inter-annual variations in outgoing long wave radiation over the tropics (1981) Mon. Wea. Rev., 109, pp. 1208-1218
- Hoffmann, J.A., Características de las series de precipitaciones en la República Argentina (1970) Meteorologica, 1 (3), pp. 166-190
- Horel, J.D., Hahmann, A.N., Geisler, J.E., An investigation of the annual cycle of convective activity over the tropical Americas (1989) J. Climate, 2, pp. 1388-1403
- Janowlak, J.E., Krueger, A.F., Arkin, P.A., Gruber, A., (1985) Atlas of Outgoing Long Wave Radiation Derived from NOM Satellite Data, 44p. , NOM Atlas no. 6, NOM/NWS/NESDIS, US Department of Commerce
- Kousky, V.E., Frontal influences on Northeast Brazil (1979) Mon. Wea. Rev., 107 (7), pp. 1140-1153
- Kousky, V.E., Pentad outgoing long wave radiation climatology for the South America sector (1988) Rev. Brasilera Meteorol., 3, pp. 217-231
- Liebmann, B., Hartmann, D., Interannual variations of outgoing IR associated with tropical circulation changes during 1974-1978 (1982) J. Atmos. Sci., 39, pp. 1153-1162
- Marengo, J., Interannual variability of surface climate in the Amazon Basin (1992) Int. J. Climate, 12, pp. 853-863
- Mitchell, T., Wallace, J., The annual cycle in equatorial convection and sea surface temperature (1992) J. Climate, 5, pp. 1140-1156
- Morrissey, M.L., Graham, N.E., Recent trends in rain gauges precipitation measurements from the tropical Pacific: Evidence for an enhanced hydrological cycle (1996) Bull. Am. Meteorol. Soc., pp. 1207-1219
- Necco, G., Comportamiento de los vórtices ciclónicos en el área sudamericana: Trayectorias y desarrollos (1982) Meteorologica, 13 (1), pp. 21-34
- Nogues-Paegle, J., Mo, K.C., Alternating Wet and Dry conditions over South America during Summer (1997) Mon. Wea. Rev., 125 (2), pp. 279-291
- Prohaska, F.J., Climates of Central and South America (1976) World Survey of Climatology, pp. 57-69. , Elsevier, Amsterdam
- Schmetz, J., Liu, Q., Outgoing long wave radiation and its diurnal variation at regional scales derived from Meteosat (1988) J. Geophys. Res., 11, pp. 192-203
- Wang, M., Paegle, J., Impact of analysis uncertainty upon regional atmospheric moisture flux (1996) J. Geophys. Res., 101, pp. 7291-7303
- Zhou, J., Lau, K., Climatology of the South American Monsoon (1997) Fifth International Conference on Southern Hemisphere Meteorology and Oceanography, pp. 160-161
Citas:
---------- APA ----------
Gonzalez, M. & Barros, V. (1998) . The relationship between tropical convection in South America and the end of the dry period in subtropical Argentina. International Journal of Climatology, 18(15), 1669-1685.http://dx.doi.org/10.1002/(SICI)1097-0088(199812)18:15<1669::AID-JOC340>3.0.CO;2-1
---------- CHICAGO ----------
Gonzalez, M., Barros, V. "The relationship between tropical convection in South America and the end of the dry period in subtropical Argentina" . International Journal of Climatology 18, no. 15 (1998) : 1669-1685.http://dx.doi.org/10.1002/(SICI)1097-0088(199812)18:15<1669::AID-JOC340>3.0.CO;2-1
---------- MLA ----------
Gonzalez, M., Barros, V. "The relationship between tropical convection in South America and the end of the dry period in subtropical Argentina" . International Journal of Climatology, vol. 18, no. 15, 1998, pp. 1669-1685.http://dx.doi.org/10.1002/(SICI)1097-0088(199812)18:15<1669::AID-JOC340>3.0.CO;2-1
---------- VANCOUVER ----------
Gonzalez, M., Barros, V. The relationship between tropical convection in South America and the end of the dry period in subtropical Argentina. Int. J. Climatol. 1998;18(15):1669-1685.http://dx.doi.org/10.1002/(SICI)1097-0088(199812)18:15<1669::AID-JOC340>3.0.CO;2-1
