Holocene climate variability in tropical South America : case history from a high-mountain wet zone in NW Colombia based on palynology and X-ray microfluorescence

Diplôme Thèse Holocene climate variability in tropical South America : case history from a high-mountain wet zone in NW Colombia based on palynology and X-ray microfluorescence eng 2012-09-24 author Munoz Uribe Paula Andrea 601677 director Gorin Georges Edouard 22771 10.13097/archive-ouverte/unige:34298 urn:nbn:ch:unige-342989 Sc. 4466 Sediments deposited in a high-altitude wet zone of the NW Andes of Colombia have been studied in order to reconstruct climatic variations in the tropics during the Holocene (the last 11'500 years). Sediments were studied by palynology and X-ray microfluorescence which can be used as proxies for temperature and rainfall and have a decadal to yearly time resolution. Results demonstrate that the Holocene record in NW Colombia is marked by rapid and very significant changes in temperature and precipitations. Temperatures may have varied (up or down) of a few degrees centigrade over less than a century. Rainfall data and regional comparisons show that the climate mechanisms that have influenced NW Colombia during the Holocene are both Pacific and Atlantic-driven. Rainfall proxies show the influence of both the El Niño Southern Oscillation (ENSO) in the Pacific and the Inter Tropical Convergence Zone (ITCZ) in the Atlantic. Subandean forest Andean forest Aquatics Holocene ENSO ITCZ Páramo Rainfall Temperature Ti Fe Younger Dryas Dewey 550 Terre et Environnement 124 42 Département des sciences de la Terre 154 false 171ca968-eb99-4ac3-b496-4b7cc2023bb9 Thesis Public ThèseMunoz.faculté.pdf 4582819 application/pdf openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre

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Holocene climate variability in tropical South America : case history from a high-mountain wet zone in NW Colombia based on palynology and X-ray microfluorescence				2012	1,261	1,480

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Munoz Uribe, Paula Andrea