Late Pleistocene–Holocene environmental and climatic history of a freshwater paramo ecosystem in the northern Andes |
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| Authors: | Luisa Patiño Maria Isabel Velez Marion Weber César A Velásquez-r Santiago David Manuela Rueda Ivonne Castañeda Diana Arboleda |
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| Institution: | 1. Programa de Medio Ambiente y Desarrollo. Universidad Nacional de Colombia, Medellín, Colombia;2. Department of Geology, University of Regina, Canada;3. Facultad de Ciencias. Universidad Nacional de Colombia, Medellín, Colombia;4. Programa de Bosques y Conservación Ambiental, Universidad Nacional de Colombia, Medellín, Colombia;5. Laboratorio de Paleoecología, Universidad Nacional de Colombia, Medellín, Colombia |
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| Abstract: | This study presents the first multi-proxy palaeoenvironmental and palaeoclimatic history for northern South America based on the palaeolimnological reconstruction of a pond located in a dry paramo at 3570 masl. During the Last Glacial Maximum (LGM), the study area was under glacial conditions, then during global events Heinrich Stadial 1 (HS1), Bølling–Allerød (BA), and the Younger Dryas (YD), the pond expanded, accumulation rates and proxies for erosion reached the highest values, indicative of humid conditions, with maxima in humidity during the BA and YD. Dry conditions and pond desiccation occurred in the Greenlandian–Northgrippian and by 6010 cal a bp the area was transformed into the mire of today. Comparisons with records from other sites in South America indicate that changes in humidity are most likely controlled by the Intertropical Convergence Zone, mainly during the glacial and postglacial, and by changes in the Pacific Ocean, more pronounced after the YD. |
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| Keywords: | dry paramo Holocene Last Glacial Maximum northern Andes Younger Dryas |
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