Perturbaciones del régimen de las lluvias y condiciones de tipo El Niño en América del Sur tropical desde hace 7000 años
Year: 1995
Type: article
Abstract: Disturbance of rainfall regime and El Niño-like conditions in tropical South America during the last 7000 years Sedimentary records from three geographically and climatically distinct South American areas allowed the reconstruction of the rainfall regime during the last 7 000 yrs. In south-eastern Amazonia, palynological and sedimentological analyses from cores retrieved in lakes of Carajás region (6o S) demonstrated the existence of several periods during which tropical rainforest fires where related to short-term (a few decades) dry periods. Likewise, in central Brazil, palynological and sedimentological analyses from two cores taken in the Salitre area (19o S) and in the Boa Vista region (27o S), revealed strong synchronous though opposite variations in the vegetation. Finally, on the northern Bolivian Altiplano, paleoba thymetric reconstructions performed in Lake Titicaca (14-17o S) also point out to large variations in the precipitation pattern, which can be related to those recorded at Carajás and Salitre. Such variations are similar to those presently related to strong El Niño events.
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
OpenAlex ID: W2339836268