Late Quaternary fluctuations of biogenic component fluxes on the continental slope of the Ross Sea, Antarctica
Ceccaroni, L.; Frank, M.; Frignani, M.; Langone, L.; Ravaioli, M.; Mangini, A. (1998). Late Quaternary fluctuations of biogenic component fluxes on the continental slope of the Ross Sea, Antarctica. J. Mar. Syst. 17(1-4): 515-525. https://dx.doi.org/10.1016/S0924-7963(98)00061-X
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, meer
Ook verschenen 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., meer
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| Trefwoorden |
Analysis > Sediment analysis > Analysis > Core analysis
Climate > Palaeoclimate
Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles > Carbon cycle
Geological time > Phanerozoic > Geological time > Cenozoic > Quaternary
Ice conditions
Palaeo studies > Oceanography > Palaeoceanography
Particulate flux
Sediments > Biogenic deposits
Topographic features > Submarine features > Continental slope
Ventilation
PS, Ross Sea [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Ceccaroni, L.
- Frank, M.
- Frignani, M.
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- Langone, L.
- Ravaioli, M.
- Mangini, A., meer
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| Abstract |
A sediment core, collected from the western part of the continental slope of the Ross Sea at 2380 m water depth, records events of the last two climatic cycles (250 kyr). A Full-size image (<1 K)-based chronology was obtained and boundaries of the isotope stages were set assuming that biological productivity was enhanced during periods of less ice cover. Then, Full-size image (<1 K), organic carbon, biogenic silica and biogenic Ba distributions were compared to the glacial–interglacial stage boundaries and corresponding ages of the Full-size image (<1 K) record of Martinson et al. [Martinson, D.G., Pisias, N.G., Hays, J.D., Imbrie, J., Moore, T.C., Jr., Shackleton, N.J, 1987. Age dating and the orbital theory of the ice ages: development of a high-resolution 0 to 300,000-year chronostratigraphy. Quaternary Research, 27: 1–29]. Sediment accumulation rates ranged between 1.2 cm kyr-1 in the isotope stage 6 and 3.8 cm kyr-1 during the Holocene. Variations in the concentrations and fluxes of organic carbon, biogenic Ba, biogenic silica and Mn gave information on palaeoclimate changes. Processes of sediment redistribution in the Ross Sea margin were enlightened from a comparison of the measured and expected fluxes of Full-size image (<1 K). Calculation of the focusing-corrected accumulation rates of biogenic Ba enabled us to evaluate the export palaeoproductivity. Corrected accumulation rates of biogenic components and calculated palaeoproductivities were low, compared to the Antarctic Polar Front in the Atlantic sector, throughout the last two climatic cycles. Glacial–interglacial changes of sea ice cover and ventilation of the Ross Sea were probably major causes of variations in biogenic particle flux and distribution of redox-sensitive elements within the sediment column. |
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