Temporal variability on dry days in Argentina. Teleconnections in La Plata Basin.

JUAN ANTONIO RIVERA; OLGA PENALBA; MARÍA LAURA BETTOLLI

Buenos Aires

Encuentro; CLARIS LPB Kick off meeting; 2008

CLARIS LPB

The knowledge of the regional behavior of dry days (days without precipitation) and his decadal-to-interdecadal variability could be a useful tool. For example, the monitoring of dry conditions,mainly in regions that has experienced the expansion of grain crops in the last years in the semi-arid borders of Argentina and are more sensitive to precipitation interannual variability. In many situations, social and economic impacts are proportional to the amount of dry days on a seasonal and annual basis. Two methods of developing dry days regionalization are explored: principal component analysis and cluster analysis, both on annual and seasonal basis. Large- and regional-scale factors interact with dry extreme events. The main objective of this poster is to illustrate some ENSO-dry extreme events relationships, and to evaluate if this extreme events are related to the variability of the South American Monsoon System (SAMS) in the North-eastern of Argentina.