INVESTIGADORES
BETTOLLI Maria Laura
congresos y reuniones científicas
Título:
Trends and periodicities in the annual amount of dry days over Argentina, looking towards the climatic change
Autor/es:
PENALBA, OLGA C; RIVERA, JUAN ANTONIO; BETTOLLI, MARIA LAURA
Lugar:
Istanbul, Turkey
Reunión:
Conferencia; Second International Conference on Drought Management: Economics of Drought and Drought Preparedness in the Mediterranean; 2010
Resumen:
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During the second half of the twentieth century, Southeastern South America experienced a positive trend
in annual precipitation. Since Argentina
is a country whose economy mostly relies on rain-fed agriculture, this trend
has favored the extension of the agricultural frontier, increasing the
availability of productive lands. However, this precipitation increase was
accompanied by greater interannual variability in precipitation, which
increases the risk of droughts and their consequent negative impacts. In this
work we analyze the temporal variability of the annual amounts of dry days
(days without rainfall) over Argentina.
We found significant trends in several regions of the country that reflects the
increments in precipitation amounts. To analyze the interdecadal variability of
dry days, we apply the wavelets analysis to the longest time series available,
some of them from the beginning of the 20th century. This analysis
identifies significant nonstationary periodicities between 8 and 16 years,
mainly in the stations of the eastern region.
