Solar activity forcing of terrestrial hydrological phenomena

MAUAS, P.J.D.; BUCCINO, A.P.; FLAMENCO, E.

Maresias

Simposio; Living Around Active Stars IAU Symposium 328; 2016

International Astronomical Union

Recently, the study of the influence of solar activity on the Earth´sclimate received strong attention, mainly due to the possibility,proposed by several authors, that global warming is not anthropogenic,but is due to an increase in solar activity. Although this possibilityhas been ruled out, there are strong evidences that solar variabilityhas an influence on Earth´s climate, in regional scales.Here we review some of these evidences, focusing in a particular aspectof climate: atmospheric moisture and related quantities likeprecipitation. In particular, we studied the influence of activity onSouth American precipitations during centuries. First, we analyzed thestream flow of the Paraná and other rivers of the region, andfound a very strong correlation with Sunspot Number in decadal timescales. We found a similar correlation between Sunspot Number andtree-ring chronologies, which allows us to extend our study to cover thelast two centuries.