2024-03-29T06:18:48Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1776152022-10-11T09:46:43Zcom_10261_47com_10261_8col_10261_300
http://hdl.handle.net/10261/177615
10.1016/j.gloplacha.2019.02.008
357482
Dating the Anthropocene in deep-sea sediments: how much carbon is buried in the Irminger Basin?
Elsevier
2019
artículo
Fontela, Marcos
Francés, Guillermo
Quintana, Begoña
Álvarez-Fernández, María Jesús
Nombela, Miguel Ángel
Alejo, Irene
Pedrosa, M. C.
Pérez, Fiz F.
rp01001
Deep-sea sedimentation rate
Subpolar North Atlantic
Irminger Basin
Carbon sink
Geochronology
Anthropocene
2019-04
31 pages, 5 figures.
Evaluation of biogeochemical processes in Anthropocene deep-sea sediments require accurate dating techniques. Here we show the results of an approach using high resolution low level background gamma spectrometry with two simultaneous hyper-pure germanium (HPGe) detectors. The quantitative role of the deepest zones (>3000 m depth) of the Irminger Basin (Subpolar North Atlantic Ocean) as a carbon sink during the Anthropocene is evaluated combining a chronology based in the natural radionuclide 210Pb with sedimentological analysis and elemental composition. The average sedimentation rate of the central Irminger is 1.28 ± 0.18 mm·yr−1, with a mean weighted flux to the sediment for inorganic and organic carbon of 46 ± 15 g·Cinorg·m−2·yr−1 and 8 ± 1 g·Corg·m−2·yr−1. The biogenic fraction of the mass flux is increased since the XXth century. The contribution of the deepest zones of the Irminger Basin to the Anthropocene carbon sequestration in the North Atlantic Ocean is considerable at basin-scale.
Ministerio de Economía y Competitividad (España)
Global and Planetary Change
2019
175
92
102