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Latitudinal d13Corg variations in sinking matter and sediments from the South Atlantic: effects of anthropogenic CO2 and implications for paleo-PCO2 reconstructions
Fischer, G.; Müller, P.J.; Wefer, G. (1998). Latitudinal d13Corg variations in sinking matter and sediments from the South Atlantic: effects of anthropogenic CO2 and implications for paleo-PCO2 reconstructions, in: Le Fèvre, J. et al. (Ed.) Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4): pp. 471-495. hdl.handle.net/10.1016/S0924-7963(98)00059-1
In: Le Fèvre, J.; Tréguer, P. (Ed.) (1998). Carbon Fluxes and Dynamic Processes in the Southern Ocean: Present and Past. Selected papers from the International JGOFS Symposium, Brest, France, 28-31 August 1995. Journal of Marine Systems, 17(1-4). Elsevier: Amsterdam. 1-619 pp., more
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963, more
Peer reviewed article  

Also published as
  • Fischer, G.; Müller, P.J.; Wefer, G. (1998). Latitudinal d13Corg variations in sinking matter and sediments from the South Atlantic: effects of anthropogenic CO2 and implications for paleo-PCO2 reconstructions. J. Mar. Syst. 17(1-4): 471-495. hdl.handle.net/10.1016/S0924-7963(98)00059-1, more

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Keywords
    Atmospheric chemistry; Atmospheric gases; Carbon 13; Carbon dioxide; Conferences; Latitudinal variations; Man-induced effects; Organic matter; Palaeo studies; Particle settling; Plankton; Sediment analysis; Sedimentation; Surface water; AS, South Atlantic [Marine Regions]; Marine

Authors  Top 
  • Fischer, G.
  • Müller, P.J.
  • Wefer, G.

Abstract
    Latitudinal variations of d13Corg of plankton, sinking particles and surface sediments of the southern Atlantic Ocean have been compiled and compared to literature-derived [CO2 (aq)] values in surface waters. We observed less variability of the sediment-d13C data at a given latitude compared to the plankton values which more sensitively record seasonal changes. In the tropical–subtropical Atlantic with low seasonality, we measured a relatively small latitudinal variation (-18.5 to -22.5‰) of the sediment-d13C. In contrast, a steep gradient of both isotope values and [CO2 (aq)] was found south of 40°S. South of 60°S, the sediment-d13C values were between -23 and -26.5‰ corresponding to generally higher [CO2 (aq)] values. The surface sediments were generally heavier by 0.5–3.2‰ in the tropical–subtropical Atlantic and 3.0–4.6‰ in Southern Ocean, respectively, compared to sinking matter; they were also heavier by up to 3.2‰ than freshly sedimented phytodetritus sampled in the Southern Ocean. These differences may at least be partly attributed to the anthropogenic PCO2 increase leading to an enhanced effect in the Southern Ocean due to increasing CO2 solubility. We estimated the preindustrial [CO2 (aq)] from sediment-d13Corg to be lower by 1–2 µmol l-1 in warm waters and up to 8 µmol l-1 in cold waters compared to present day measurements. We found that the isotope values of the surface sediments were generally linked to surface water [CO2 (aq)] (preindustrial), resulting in a relationship rather similar to that derived from plankton data [Rau, G.H., 1994. Variations in sedimentary organic d13C as a proxy for past changes in ocean and atmospheric CO2 concentrations. In: Zahn, R., Pedersen, T.F., Kaminski, M.A., Labeyrie, L. (Eds.), Carbon Cycling in the Glacial Ocean, NATO Asi Series, Global Environmental Change, Vol. 17]. However, estimations of past [CO2 (aq)] from sediment-d13Corg may have a large uncertainty especially in the Southern Ocean. Here, our data show the weakest correlation, probably due to effects of changing growth rates and productivity, in particular at the frontal zones.

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