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Late glacial initiation of Holocene eastern Mediterranean sapropel formation.

Identifieur interne : 002A08 ( PubMed/Checkpoint ); précédent : 002A07; suivant : 002A09

Late glacial initiation of Holocene eastern Mediterranean sapropel formation.

Auteurs : Rosina Grimm [Allemagne] ; Ernst Maier-Reimer [Allemagne] ; Uwe Mikolajewicz [Allemagne] ; Gerhard Schmiedl [Allemagne] ; Katharina Müller-Navarra [Allemagne] ; Fanny Adloff [France] ; Katharine M. Grant [Australie] ; Martin Ziegler [Pays-Bas] ; Lucas J. Lourens [Pays-Bas] ; Kay-Christian Emeis [Allemagne]

Source :

RBID : pubmed:26028337

Descripteurs français

English descriptors

Abstract

Recurrent deposition of organic-rich sediment layers (sapropels) in the eastern Mediterranean Sea is caused by complex interactions between climatic and biogeochemical processes. Disentangling these influences is therefore important for Mediterranean palaeo-studies in particular, and for understanding ocean feedback processes in general. Crucially, sapropels are diagnostic of anoxic deep-water phases, which have been attributed to deep-water stagnation, enhanced biological production or both. Here we use an ocean-biogeochemical model to test the effects of commonly proposed climatic and biogeochemical causes for sapropel S1. Our results indicate that deep-water anoxia requires a long prelude of deep-water stagnation, with no particularly strong eutrophication. The model-derived time frame agrees with foraminiferal δ(13)C records that imply cessation of deep-water renewal from at least Heinrich event 1 to the early Holocene. The simulated low particulate organic carbon burial flux agrees with pre-sapropel reconstructions. Our results offer a mechanistic explanation of glacial-interglacial influence on sapropel formation.

DOI: 10.1038/ncomms8099
PubMed: 26028337


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pubmed:26028337

Le document en format XML

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<div type="abstract" xml:lang="en">Recurrent deposition of organic-rich sediment layers (sapropels) in the eastern Mediterranean Sea is caused by complex interactions between climatic and biogeochemical processes. Disentangling these influences is therefore important for Mediterranean palaeo-studies in particular, and for understanding ocean feedback processes in general. Crucially, sapropels are diagnostic of anoxic deep-water phases, which have been attributed to deep-water stagnation, enhanced biological production or both. Here we use an ocean-biogeochemical model to test the effects of commonly proposed climatic and biogeochemical causes for sapropel S1. Our results indicate that deep-water anoxia requires a long prelude of deep-water stagnation, with no particularly strong eutrophication. The model-derived time frame agrees with foraminiferal δ(13)C records that imply cessation of deep-water renewal from at least Heinrich event 1 to the early Holocene. The simulated low particulate organic carbon burial flux agrees with pre-sapropel reconstructions. Our results offer a mechanistic explanation of glacial-interglacial influence on sapropel formation.</div>
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<AbstractText>Recurrent deposition of organic-rich sediment layers (sapropels) in the eastern Mediterranean Sea is caused by complex interactions between climatic and biogeochemical processes. Disentangling these influences is therefore important for Mediterranean palaeo-studies in particular, and for understanding ocean feedback processes in general. Crucially, sapropels are diagnostic of anoxic deep-water phases, which have been attributed to deep-water stagnation, enhanced biological production or both. Here we use an ocean-biogeochemical model to test the effects of commonly proposed climatic and biogeochemical causes for sapropel S1. Our results indicate that deep-water anoxia requires a long prelude of deep-water stagnation, with no particularly strong eutrophication. The model-derived time frame agrees with foraminiferal δ(13)C records that imply cessation of deep-water renewal from at least Heinrich event 1 to the early Holocene. The simulated low particulate organic carbon burial flux agrees with pre-sapropel reconstructions. Our results offer a mechanistic explanation of glacial-interglacial influence on sapropel formation.</AbstractText>
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<RefSource>Science. 2001 Nov 30;294(5548):1917-20</RefSource>
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<RefSource>Nature. 2012 Apr 04;484(7392):49-54</RefSource>
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<CommentsCorrections RefType="Cites">
<RefSource>Nature. 2012 Nov 29;491(7426):744-7</RefSource>
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