Editorial Type:
Article
Article Type:
Research Article

Joint Diagnostic of the Surface Air Temperature in Southern South America and the Madden–Julian Oscillation

Gustavo Naumann National Scientific and Technological Research Council (CONICET), and Department of Atmospheric and Oceanic Sciences, Faculty of Sciences, University of Buenos Aires, Buenos Aires, Argentina

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Walter M. Vargas National Scientific and Technological Research Council (CONICET), and Department of Atmospheric and Oceanic Sciences, Faculty of Sciences, University of Buenos Aires, Buenos Aires, Argentina

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Print Publication:
01 Aug 2010
DOI:
https://doi.org/10.1175/2010WAF2222418.1
Page(s):
1275–1280
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Abstract

The objective of this research is to explore the relationship between maximum and minimum temperatures, daily precipitation, and the Madden–Julian oscillation (MJO). It was found that the different phases of the MJO show a consistent signal on winter temperature variability and precipitation in southeastern South America. Additionally, this paper explores the spatial–temporal variations of mutual information and joint entropy between temperature and the MJO. A defined spatial pattern was observed with an increased signal in northeastern Argentina and southern Brazil. In the local mutual information analysis, periods in which the mutual information doubled the average values were observed over the entire region. These results indicate that these connections can be used to forecast winter temperatures with a better skill score in situations where both variables covary.

Corresponding author address: Gustavo Naumann, F.C.E. y N., Universidad de Buenos Aires, Intendente Güiraldes 2160, Pab II, 2nd Fl., Buenos Aires C1428EGA, Argentina. Email: gnaumann@at.fcen.uba.ar

Abstract

The objective of this research is to explore the relationship between maximum and minimum temperatures, daily precipitation, and the Madden–Julian oscillation (MJO). It was found that the different phases of the MJO show a consistent signal on winter temperature variability and precipitation in southeastern South America. Additionally, this paper explores the spatial–temporal variations of mutual information and joint entropy between temperature and the MJO. A defined spatial pattern was observed with an increased signal in northeastern Argentina and southern Brazil. In the local mutual information analysis, periods in which the mutual information doubled the average values were observed over the entire region. These results indicate that these connections can be used to forecast winter temperatures with a better skill score in situations where both variables covary.

Corresponding author address: Gustavo Naumann, F.C.E. y N., Universidad de Buenos Aires, Intendente Güiraldes 2160, Pab II, 2nd Fl., Buenos Aires C1428EGA, Argentina. Email: gnaumann@at.fcen.uba.ar

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