10.5194_CP-7-299-2011.pdf (3.21 MB)
Ultra-high resolution pollen record from the northern Andes reveals rapid shifts in montane climates within the last two glacial cycles
journal contribution
posted on 2012-10-24, 09:06 authored by M.H.M. Groot, R.G. Bogotá, L.J. Lourens, H. Hooghiemstra, M. Vriend, Juan C. Berrio, E. Tuenter, J. Van Der Plicht, B. Van Geel, M. Ziegler, S.L. Weber, A. Betancourt, L. Contreras, S. Gaviria, C. Giraldo, N. González, J.H.F. Jansen, M. Konert, D. Ortega, O. Rangel, G. Sarmiento, J. Vandenberghe, T. Van Der Hammen, M. Van Der Linden, W. WesterhoffHere 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.
History
Citation
Climate of the Past, 2011, 7 (1), pp. 299-316Version
- VoR (Version of Record)
Published in
Climate of the PastPublisher
Copernicus Publications on behalf of the European Geosciences Unioneissn
1814-9332Copyright date
2011Available date
2012-10-24Publisher DOI
Publisher version
http://www.clim-past.net/7/299/2011/cp-7-299-2011.htmlLanguage
enAdministrator link
Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC