Editorial Type:
Article
Article Type:
Research Article

Cross–Time Scale Interactions and Rainfall Extreme Events in Southeastern South America for the Austral Summer. Part I: Potential Predictors

Á. G. Muñoz International Research Institute for Climate and Society, The Earth Institute, Columbia University, Palisades, New York, and Centro de Modelado Científico, Universidad del Zulia, Maracaibo, Venezuela

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L. Goddard International Research Institute for Climate and Society, The Earth Institute, Columbia University, Palisades, New York

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A. W. Robertson International Research Institute for Climate and Society, The Earth Institute, Columbia University, Palisades, New York

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Y. Kushnir Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York

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W. Baethgen International Research Institute for Climate and Society, The Earth Institute, Columbia University, Palisades, New York

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Print Publication:
01 Oct 2015
DOI:
https://doi.org/10.1175/JCLI-D-14-00693.1
Page(s):
7894–7913
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Abstract

The physical mechanisms and predictability associated with extreme daily rainfall in southeastern South America (SESA) are investigated for the December–February season in a two-part study. Through a k-mean analysis, this first paper identifies a robust set of daily circulation regimes that are used to link the frequency of rainfall extreme events with large-scale potential predictors at subseasonal-to-seasonal scales. This represents a basic set of daily circulation regimes related to the continental and oceanic phases of the South Atlantic convergence zone (SACZ) and wave train patterns superimposed on the Southern Hemisphere polar jet. Some of these recurrent synoptic circulation types are conducive to extreme rainfall events in the region through synoptic control of different mesoscale physical features and, at the same time, are influenced by climate phenomena that could be used as sources of potential predictability. Extremely high rainfall (as measured by the 95th and 99th percentiles) is associated with two of these weather types (WTs), which are characterized by moisture advection intrusions from lower latitudes and the Pacific Ocean; another three WTs, characterized by above-normal moisture advection toward lower latitudes or the Andes, are associated with dry days (days with no rain). The analysis permits the identification of several subseasonal-to-seasonal scale potential predictors that modulate the occurrence of circulation regimes conducive to extreme rainfall events in SESA. It is conjectured that a cross–time scale interaction between the different climate drivers improves the predictive skill of extreme precipitation in the region.

Denotes Open Access content.

Corresponding author address: Á. G. Muñoz, International Research Institute for Climate and Society (IRI), Monell Building, Columbia University, 61 Route 9W, Palisades, NY 10964-1000. E-mail: agmunoz@iri.columbia.edu

Abstract

The physical mechanisms and predictability associated with extreme daily rainfall in southeastern South America (SESA) are investigated for the December–February season in a two-part study. Through a k-mean analysis, this first paper identifies a robust set of daily circulation regimes that are used to link the frequency of rainfall extreme events with large-scale potential predictors at subseasonal-to-seasonal scales. This represents a basic set of daily circulation regimes related to the continental and oceanic phases of the South Atlantic convergence zone (SACZ) and wave train patterns superimposed on the Southern Hemisphere polar jet. Some of these recurrent synoptic circulation types are conducive to extreme rainfall events in the region through synoptic control of different mesoscale physical features and, at the same time, are influenced by climate phenomena that could be used as sources of potential predictability. Extremely high rainfall (as measured by the 95th and 99th percentiles) is associated with two of these weather types (WTs), which are characterized by moisture advection intrusions from lower latitudes and the Pacific Ocean; another three WTs, characterized by above-normal moisture advection toward lower latitudes or the Andes, are associated with dry days (days with no rain). The analysis permits the identification of several subseasonal-to-seasonal scale potential predictors that modulate the occurrence of circulation regimes conducive to extreme rainfall events in SESA. It is conjectured that a cross–time scale interaction between the different climate drivers improves the predictive skill of extreme precipitation in the region.

Denotes Open Access content.

Corresponding author address: Á. G. Muñoz, International Research Institute for Climate and Society (IRI), Monell Building, Columbia University, 61 Route 9W, Palisades, NY 10964-1000. E-mail: agmunoz@iri.columbia.edu
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