Browsing by Autor "U. Schotterer"

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Climate variability during the last 1000 years inferred from Andean ice cores: A review of methodology and recent results
(Elsevier BV, 2008) Françoise Vimeux; Patrick Ginot; Margit Schwikowski; Mathias Vuille; Georg F. Hoffmann; Lonnie G. Thompson; U. Schotterer
Environmental records from temperate glacier ice on Nevado Coropuna saddle, southern Peru
(Copernicus Publications, 2009) J. Herreros; Isabel Moreno; Jean‐Denis Taupin; Patrick Ginot; Nicolas Patris; M. de Angelis; Marie‐Pierre Ledru; Fanny Delachaux; U. Schotterer
Abstract. We investigated past climate variability and the zonal short and long-range transport of air masses in tropical South America using chemical, isotopic and palynological signals from a 42 m-long ice core recovered in 2003 from the saddle of the Nevado Coropuna, southern Peru (72°39´ W; 15°32´ S; 6080 m a.s.l.). We found that precipitation at this site depends mainly on the easterly circulation of air masses originated from the tropical Atlantic Ocean. Nevertheless, sporadic Pacific air masses arrivals, and strong cold waves coming from southern South America reach this altitude site. In spite of post-depositional effects, we were able to identify two strong ENSO (El Niño-Southern Oscillation) event signatures (1982–1983 and 1992) and the eruptive activity of the nearby Sabancaya volcano (1994).
Glaciers and Climate in the Andes between the Equator and 30° S: What is Recorded under Extreme Environmental Conditions?
(Springer Nature (Netherlands), 2003) U. Schotterer; Martín Grosjean; Willibald Stichler; Patrick Ginot; C. Kull; H. Bonnaveira; Bernard Francou; H. W. Gäggeler; Robert Gallaire; Georg F. Hoffmann
Potential for climate variability reconstruction from Andean glaciochemical records
(Cambridge University Press, 2002) Patrick Ginot; Margit Schwikowski; U. Schotterer; Willibald Stichler; H. W. Gäggeler; Bernard Francou; Robert Gallaire; Bernard Pouyaud
Abstract In order to select glacier sites suitable for the reconstruction of short-term climate variability, chemical constituents of shallow cores from Chimborazo, Ecuador, Illimani, Bolivia, and Cerro Tapado, Chile, were analyzed to determine if they represent the climate and atmospheric conditions of the particular area. Pronounced variations were observed in the Chimborazo core, which were attributed to the seasonal occurrence of wet and dry periods. Using chemical tracers, the Pacific and the Amazon basin were identified as the two principal sources of atmospheric moisture. In the Illimani record, seasonality is obvious but is less regular than in the Chimborazo core. Chemical tracers point to the Amazon basin as a moisture source. Post-depositional sublimation masks a possible atmospheric signal in the glaciochemical records from Cerro Tapado. the arid conditions and a prevailing high condensation level also cause little variability in the stable-isotope content. Irregular, more negative δ 18 O values occur during the humid phases of El Niño events. Despite alterations due to sublimation, chemical tracers indicate the Pacific Ocean as a main moisture source for precipitation preserved on Glaciar CerroTapado.