Mañana, JUEVES, 24 DE ABRIL, el sistema se apagará debido a tareas habituales de mantenimiento a partir de las 9 de la mañana. Lamentamos las molestias.
Middle-to-late Holocene palaeoenvironmental reconstruction from the A294 ice-cave record (Central Pyrenees, northern Spain)
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
Elsevier B.V.Date
2017-12-20Citation
10.1016/j.epsl.2017.12.027
Earth and Planetary Science Letters 484 (2018): 135-144
ISSN
0012-821XDOI
10.1016/j.epsl.2017.12.027Funded by
This work was supported by the Spanish Government and the European Regional Development Fund (projects CGL2009-10455/BTE, CTM2013-48639-C2-1-R CGL2016-77479-R). This is a contribution by PaleoQ and Geomorfología y Cambio Global groups (Aragón Government and European Social Fund) and IUCA (University of Zaragoza)Project
Gobierno de España. CGL2009-10455/BTE; Gobierno de España. CTM2013-48639-C2-1-R; Gobierno de España. CGL2016-77479-REditor's Version
https://doi.org/10.1016/j.epsl.2017.12.027Subjects
Firn ice cave; Radiocarbon dating; Isotopic composition; Holocene climate; Central Pyrenees; GeologíaRights
© 2017 Elsevier B.V.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
Perennial ice deposits in caves represent unique, but underexplored, terrestrial sequences that potentially contain outstanding palaeoclimatic records.
Here, we present a pioneer palaeoenvironmental study of an ice deposit preserved in a small sag-type cave (A294) in the Central Pyrenees (northern Iberian Peninsula). The 9.25-m thick sequence, which is dated
from 6100 ± 107 to 1888 ± 64 cal BP, represents the oldest known firn ice record worldwide. The stratigraphy (detrital layers, unconformities, and cross stratification), plant macrofossils, and isotopic signature (similarity between the ice linear distribution, δ2H = 7.83δ18O + 8.4, and the Global Meteoric Water Line) of the ice point to the diagenesis of
snow introduced to the cave by winter snowstorms. Four phases of
rapid ice accumulation (6100–5515, 4945–4250, 3810–3155, and 2450–1890 cal BP) are related to wetter and colder winters.
Comparison of the isotopic composition (δ18O and deuterium excess) of the ice with
other paleoclimate records show that both source effects and the North Atlantic Oscillation (NAO) mechanism exert a dominant influence on the ice cave record. The NAO signal may be a combination of source effects and rainfall amount. Three intervals with low ice accumulation occurred between the phases of rapid accumulation and were related to drier, and possibly warmer, winters.
These centennial-scale episodes appear to be in-phase with regional arid events, as established from high altitude lacustrine records and can be correlated to global Rapid Climate Change events. The current warming trend has dramatically decreased the volume of the ice deposit in cave A294
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Google Scholar:Sancho, Carlos
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Belmonte, Ànchel
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Bartolomé, Miguel
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Moreno, Ana
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Leunda, María
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López Martínez, Jerónimo
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