Facultad de Agronomia - UBA

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Acceso al documento : Documento de Acceso Restringido. Disponible sólo para la Comunidad FAUBA.
URL al registro : http://ri.agro.uba.ar/cgi-bin/library.cgi?a=d&c=arti&d=2013cavalcanti
Tipo de material : Artículo
Autores : Cavalcanti, I. F. A.; Müller, G. V.; Andrade, K. M.; Fernández Long, M. E.
Título en inglés : Cold air intrusions over southeastern South America - GFDL model behavior regarding climate simulations in the 20th century and future projections
Fuente : Global and Planetary Change
Año : 2013
Volumen y número : Vol.111
Temas : ATMOSPHERIC FEATURES; CMIP3-GFDL-CM2.0; COLD AIR INTRUSION; FUTURE PROJECTIONS; TEMPERATURE CHANGES IN SOUTH AMERICA; TEMPERATURE EXTREMES; COLD AIR; ATMOSPHERIC TEMPERATURE; COMPUTER SIMULATION; GLOBAL WARMING; CLIMATE MODELS; AGRICULTURAL PRODUCTION; AIRFLOW; CLIMATE MODELING; CLIMATE PREDICTION; EXTREME EVENT; FROST; GENERAL CIRCULATION MODEL; NATURE-SOCIETY RELATIONS; TEMPERATURE ANOMALY; TEMPERATURE GRADIENT; TWENTIETH CENTURY; SOUTH AMERICA
Idioma : inglés
Páginas :  p.31-42
Resumen : Cold air intrusions in three areas frequently affected by frosts of southeastern South America are analyzed based on GFDL-CM2.0 Coupled Atmospheric and Oceanic Global Circulation Model. The general objective is to investigate the model ability to simulate the frequency of intrusions in the present climate as well as the changes in the frequency of occurrence and atmospheric characteristics in a future climate scenario. The cold period (May to September) is analyzed for the control period 1961 to 1990 and for the period 2081 to 2100 from the CMIP3 A2 scenario, which reflects the extreme global warming. The coupled GFDL-CM2.0 overestimated the number of cold air intrusions for the present climate (control). This systematic error should be considered in the analyses of future climate results. Future projections indicated a reduction of these cases in GFDL results. As this model overestimated the number of cases, the reduction could be even greater. Composites of extreme cases for the present and future climate in the three areas indicated intensification of the temperature gradient which suggests more vigorous frontal systems, intensification of post-frontal highs and cold air extending to lower latitudes as compared to the present climate. Anomaly intensification was related to the climatological mean temperature, which is higher in the future than in the present. Therefore, even with less cold air intrusion over southeastern South America and a lower number of frost cases in the three areas, the occurrence of more intense systems would have an impact on the agriculture of these areas and such impact would extend to lower latitudes.
DOI : 10.1016/j.gloplacha.2013.08.006
Link al editor : http://www.elsevier.com/
Cita recomendada : Cavalcanti, I. F. A., Müller, G. V., Andrade, K. M., & Fernández Long, M. E. (2013). Cold air intrusions over southeastern South America - GFDL model behavior regarding climate simulations in the 20th century and future projections. Global and Planetary Change‚ 111‚  p.31-42. Doi: 10.1016/j.gloplacha.2013.08.006.
 
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