Astronomical forcing of contrasting rainfall changes in tropical South America between 12,400 and 8800 cal yr B.P.

Auteur(s) et Affiliation(s)



Description :
Today, precipitation over tropical South America is largelly controlled by the seasonal movements of the Inter-Tropical Convergence Zone (ITCZ). In this paper, the AA. reconstruct the rainfall regimes from 2 sedimentary records in South America that exhibit contrasting characteristics (southeastern Amazonia and the northern part of the Bolivian Altiplano). The paleoclimatic reconstructions are compared with present-day climatic conditions in the 2 regions and with other tropical South American records. The results suggest that the ITCZ during summer was farther north than it is today.


Type de document :
Article de périodique

Source :
Quaternary research, issn : 0033-5894, 1997, vol. 47, n°. 1, p. 117-122, Collation : Illustration, Références bibliographiques : 30 ref.

Date :
1997

Editeur :
Pays édition : Etats-Unis, San Diego, CA, Elsevier