Title:
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Long-period astronomically-forced terrestrial carbon sinks
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Author:
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Valero Montesa, Luis; Cabrera, Lluís; Sáez, Alberto; Garcés Crespo, Miguel
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Rotació de la Terra -Magnetoestratigrafia -Paleoclimatologia -Oligocè -Cicle del carboni (Biogeoquímica) -Earth rotation -Magnetostratigraphy -Paleoclimatology -Oligocene -Carbon cycle (Biogeochemistry) |
Rights:
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cc-by-nc-nd (c) Elsevier B.V., 2016
info:eu-repo/semantics/embargoedAccess
http://creativecommons.org/licenses/by-nc-nd/3.0/es |
Document type:
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Article Article - Accepted version |
Published by:
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Elsevier B.V.
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