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https://hdl.handle.net/2445/98209
Title: | Long-period astronomically-forced terrestrial carbon sinks |
Author: | Valero Montesa, Luis Cabrera, Lluís Sáez, Alberto Garcés Crespo, Miguel |
Keywords: | Rotació de la Terra Magnetoestratigrafia Paleoclimatologia Oligocè Cicle del carboni (Biogeoquímica) Earth rotation Magnetostratigraphy Paleoclimatology Oligocene Carbon cycle (Biogeochemistry) |
Issue Date: | Mar-2016 |
Publisher: | Elsevier B.V. |
Abstract: | 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. |
Note: | Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.epsl.2016.03.038 |
It is part of: | Earth and Planetary Science Letters, 2016, vol. 444, p. 131-138 |
URI: | https://hdl.handle.net/2445/98209 |
Related resource: | http://dx.doi.org/10.1016/j.epsl.2016.03.038 |
ISSN: | 0012-821X |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
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