Data/hora: 06/06/2024 14:48:33

Provedor de dados: | 5
País: | France
Título: | Ultra-high resolution pollen record from the northern Andes reveals rapid shifts in montane climates within the last two glacial cycles
Autores: | Groot, M. H. M.; Bogota, R. G.; Lourens, L. J.; Hooghiemstra, H.; Vriend, M.; Berrio, J. C.; Tuenter, E.; Van Der Plicht, J.; Van Geel, B.; Ziegler, M.; Weber, S. L.; Betancourt, A.; Contreras, L.; Gaviria, S.; Giraldo, C.; Gonzalez, N.; Jansen, J. H. F.; Konert, M.; Ortega, D.; Rangel, O.; Sarmiento, G.; Vandenberghe, J.; Van Der Hammen, T.; Van Der Linden, M.; Westerhoff, W.
Data: | 2011
Ano: | 2011
Resumo: | Here we developed a composite pollen-based record of altitudinal vegetation changes from Lake Fuquene (5 degrees N) in Colombia at 2540m elevation. We quantitatively calibrated Arboreal Pollen percentages (AP%) into mean annual temperature (MAT) changes with an unprecedented similar to 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 similar to 100 and 41-kyr (obliquity) paced glacial cycles and is superimposed by extreme changes of up to 7 to 10 degrees 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00228/33889/32230.pdf

DOI:10.5194/cp-7-299-2011

https://archimer.ifremer.fr/doc/00228/33889/

Editor: | Copernicus Gesellschaft Mbh
Formato: | application/pdf
Fonte: | Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2011 , Vol. 7 , N. 1 , P. 299-316

Fonte:

Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License

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