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Provedor de dados:  ArchiMer
País:  France
Título:  Radiocarbon constraints on the extent and evolution of the South Pacific glacial carbon pool
Autores:  Ronge, T. A.
Tiedemann, R.
Lamy, F.
Koehler, P.
Alloway, B. V.
De Pol-holz, R.
Pahnke, K.
Southon, J.
Wacker, L.
Data:  2016-05
Ano:  2016
Resumo:  During the last deglaciation, the opposing patterns of atmospheric CO2 and radiocarbon activities (Delta C-14) suggest the release of C-14-depleted CO2 from old carbon reservoirs. Although evidences point to the deep Pacific as a major reservoir of this C-14-depleted carbon, its extent and evolution still need to be constrained. Here we use sediment cores retrieved along a South Pacific transect to reconstruct the spatio-temporal evolution of Delta C-14 over the last 30,000 years. In similar to 2,500-3,600 m water depth, we find C-14-depleted deep waters with a maximum glacial offset to atmospheric (14)(C) (Delta Delta C-14 = -1,000%). Using a box model, we test the hypothesis that these low values might have been caused by an interaction of aging and hydrothermal CO2 influx. We observe a rejuvenation of circumpolar deep waters synchronous and potentially contributing to the initial deglacial rise in atmospheric CO2. These findings constrain parts of the glacial carbon pool to the deep South Pacific.
Tipo:  Text
Idioma:  Inglês

Editor:  Nature Publishing Group
Formato:  application/pdf
Fonte:  Nature Communications (2041-1723) (Nature Publishing Group), 2016-05 , Vol. 7 , N. 11487 , P. 1-12-
Direitos:  This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material


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