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Rapid Shifts in South American Montane Climates Driven by PCo2 and Ice Volume Changes Over the Last Two Glacial Cycles : Volume 6, Issue 5 (08/10/2010)

By Groot, M. H. M.

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Book Id: WPLBN0003977401
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Rapid Shifts in South American Montane Climates Driven by PCo2 and Ice Volume Changes Over the Last Two Glacial Cycles : Volume 6, Issue 5 (08/10/2010)  
Author: Groot, M. H. M.
Volume: Vol. 6, Issue 5
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Lourens, L. J., Gaviria, S., Hooghiemstra, H., González, N., Betancourt, A., Weber, S. L.,...Der Linden, M. V. (2010). Rapid Shifts in South American Montane Climates Driven by PCo2 and Ice Volume Changes Over the Last Two Glacial Cycles : Volume 6, Issue 5 (08/10/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: University of Amsterdam, Institute for Biodiversity and Ecosystem Dynamics, Science Park 904, 1098 XH Amsterdam, The Netherlands. Tropical montane biome migration patterns in the northern Andes are found to be coupled to glacial-induced mean annual temperature (MAT) changes; however, the accuracy and resolution of current records are insufficient to fully explore their magnitude and rates of change. Here we present a ~60-year resolution pollen record over the past 284 000 years from Lake Fúquene (5° N) in Colombia. This record shows rapid and extreme MAT changes at 2540 m elevation of up to 10 ± 2 °C within a few hundred of years that concur with the ~100 and 41-kyr (obliquity) paced glacial cycles and North Atlantic abrupt climatic events as documented in ice cores and marine sediments. Using transient climate modelling experiments we demonstrate that insolation-controlled ice volume and greenhouse gasses are the major forcing agents causing the orbital MAT changes, but that the model simulations significantly underestimate changes in lapse rates and local hydrology and vegetation feedbacks within the studied region due to its low spatial resolution.

Summary
Rapid shifts in South American montane climates driven by pCO2 and ice volume changes over the last two glacial cycles

Excerpt
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