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Coherent isotope history of Andean ice cores over the last century

2003; American Geophysical Union; Volume: 30; Issue: 4 Linguagem: Inglês

10.1029/2002gl014870

1944-8007

G. Hoffmann, Edson Ramírez, Jean‐Denis Taupin, Bernard Francou, Pierre Ribstein, R. Delmas, Hans H. Dürr, Robert Gallaire, Jefferson Cárdia Simões, U. Schotterer, M. Stiévenard, Martin Werner,

Geology and Paleoclimatology Research

Isotope records from Andean ice cores provide detailed and high‐resolution climate information on various time scales. However, the relationship between these valuable isotope records and local or regional climate remains poorly understood. Here we present results from two new drillings in Bolivia, from the Illimani and the Sajama ice caps. All four high altitude isotope signals in the Andes now available (Huascarán, Quelccaya, Illimani and Sajama) show near identical decadal variability in the 20th century. Comparison with general circulation model results and meteorological data suggest that the Andean high altitude records are primarily controlled by precipitation variability over the Amazon basin.