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2016-03

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cc-by-nc-nd (c) Elsevier B.V., 2016
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/98209

Long-period astronomically-forced terrestrial carbon sinks

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Recurs relacionat

http://dx.doi.org/10.1016/j.epsl.2016.03.038

Resum

Sequestration of organic matter by peat accumulation constitutes a primary sink for carbon in the global carbon cycle. The processes that control the formation and storage of peat at geological time scales are poorly understood but are of a non-solved issue of fundamental importance for understanding the global climate system. We analyzed a 7million years long terrestrial record of Late Oligocene age from the As Pontes Basin in Northern Spain, which demonstrates that minima in the 405-kyr and 2.4-Myr eccentricity cycles play a key role in peat formation. Such nodes exhibit reduced precession amplitudes, thus avoiding extremes in seasons and seasonal contrast for a prolonged period of time. In the As Pontes Basin, this orbital configuration is associated with a decrease in siliciclastic sedimentation and enhanced peat formation. Feedbacks between equilibrium landscapes and ecosystem stability will lead to a deceleration of weathering and erosion rates in catchment areas and to minimum and stable sediment flux along the sediment routing system. Mid-latitude peat burial could contribute to disturb the carbon cycle by removing (atmospheric) carbon at times of minimum eccentricity.

Matèries

Rotació de la Terra, Magnetoestratigrafia, Paleoclimatologia, Oligocè, Cicle del carboni (Biogeoquímica)

Matèries (anglès)

Earth rotation, Magnetostratigraphy, Paleoclimatology, Oligocene, Carbon cycle (Biogeochemistry)

Citació

Col·leccions

Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

Citació

VALERO MONTESA, Luis, et al. Long-period astronomically-forced terrestrial carbon sinks. Earth and Planetary Science Letters. 2016. Vol. 444, num. 131-138. ISSN 0012-821X. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/98209

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