ASHLEY, Kate E.; CROSTA, Xavier; ETOURNEAU, Johan; CAMPAGNE, Philippine; GILCHRIST, Harry; IBRAHEEM, Uthmaan; GREENE, Sarah; SCHMIDT, Sabine; ELEY, Yvette; MASSÉ, Guillaume; BENDLE, James

doi:10.5194/bg-18-5555-2021

ASHLEY, Kate E.
School of Geography, Earth and Environmental Sciences [Birmingham]

CROSTA, Xavier

Environnements et Paléoenvironnements OCéaniques [EPOC]

ETOURNEAU, Johan

École Pratique des Hautes Études [EPHE]
Environnements et Paléoenvironnements OCéaniques [EPOC]

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Biogeosciences. 2021-10-14p. 5555-5571

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The Antarctic coastal zone is an area of high primary productivity, particularly within coastal polynyas, where large phytoplankton blooms and drawdown of CO2 occur. Reconstruction of historical primary productivity changes and the associated driving factors could provide baseline insights on the role of these areas as sinks for atmospheric CO2 , especially in the context of projected changes in coastal Antarctic sea ice. Here we investigate the potential for using carbon isotopes (δ13C) of fatty acids in marine sediments as a proxy for primary productivity. We use a highly resolved sediment core from off the coast of Adélie Land spanning the last ∼ 400 years and monitor changes in the concentrations and δ13C of fatty acids along with other proxy data from the same core. We discuss the different possible drivers of their variability and argue that C24fatty acid δ13C predominantly reflects phytoplankton productivity in openwater environments, while C18 fatty acid δ13C reflects productivity in the marginal ice zone. These new proxies have implications for better understanding carbon cycle dynamics in the Antarctica coastal zone in future palaeoclimate studies.< Leer menos

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https://oskar-bordeaux.fr/handle/20.500.12278/188558

DOI

http://dx.doi.org/10.5194/bg-18-5555-2021

Proyecto europeo

Novel Lipid Biomarkers from Polar Ice: Climatic and Ecological Applications.

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EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

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Exploring the use of compound-specific carbon isotopes as a palaeoproductivity proxy off the coast of Adélie Land, East Antarctica

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Resumen en inglés

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DOI

Proyecto europeo

Centros de investigación