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|Title:||Ultra-high resolution pollen record from the northern Andes reveals rapid shifts in montane climates within the last two glacial cycles|
Berrio, Juan C.
Van Der Plicht, J.
Van Geel, B.
Van Der Hammen, T.
Van Der Linden, M.
|Publisher:||Copernicus Publications on behalf of the European Geosciences Union|
|Citation:||Climate of the Past, 2011, 7 (1), pp. 299-316|
|Abstract:||Here we developed a composite pollen-based record of altitudinal vegetation changes from Lake Fúquene (5° N) in Colombia at 2540 m elevation. We quantitatively calibrated Arboreal Pollen percentages (AP%) into mean annual temperature (MAT) changes with an unprecedented ~60-year resolution over the past 284 000 years. An age model for the AP% record was constructed using frequency analysis in the depth domain and tuning of the distinct obliquity-related variations to the latest marine oxygen isotope stacked record. The reconstructed MAT record largely concurs with the ~100 and 41-kyr (obliquity) paced glacial cycles and is superimposed by extreme changes of up to 7 to 10° Celsius within a few hundred years at the major glacial terminations and during marine isotope stage 3, suggesting an unprecedented North Atlantic – equatorial link. Using intermediate complexity transient climate modelling experiments, we demonstrate that ice volume and greenhouse gasses are the major forcing agents causing the orbital-related MAT changes, while direct precession-induced insolation changes had no significant impact on the high mountain vegetation during the last two glacial cycles.|
|Rights:||Copyright © the authors, 2011. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
|Appears in Collections:||Published Articles, Dept. of Geography|
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|10.5194_CP-7-299-2011.pdf||Published (publisher PDF)||3.29 MB||Adobe PDF||View/Open|
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