10Be records of sediment cores from high northern latitudes: Implications for environmental and climatic changes

Details 10Be records of sediment cores from high northern latitudes: Implications for environmental and climatic changes 10Be records of sediment cores from high northern latitudes: Implications for environmental and climatic changes

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.124..171e&link_type=abstract

Earth and Planetary Science Letters, Volume 124, Issue 1-4, p. 171-184.

Mathematics

Logic

15

Scientific paper

The 10Be records of four sediment cores forming a transect from the Norwegian Sea at 70°N (core 23059) via the Fram Strait (core 23235) to the Arctic Ocean at 86°N (cores 1533 and 1524) were measured at a high depth resolution. Although the material in all the cores was controlled by different sedimentological regimes, the 10Be records of these cores were superimposed by glacial/interglacial changes in the sedimentary environment. Core sections with high 10Be concentrations ( > 1 . 109 at/g) are related to interglacial stages and core sections with low 10Be concentrations ( < 0.5 . 109 at/g) are related to glacial stages. Climatic transitions (e.g., Termination II, 5/6) are marked by drastic changes in the 10Be concentrations of up to one order of magnitude. The average 10Be concentrations for each climatic stage show an inverse relationship to their corresponding sedimentation rates, indicating that the 10Be records are the result of dilution with more or less terrigenous ice-rafted material. However, there are strong changes in the 10Be fluxes (e.g., Termination II) into the sediments which may also account for the observed oscillations. Most likely, both processes affected the 10Be records equally, amplifying the contrast between lower (glacials) and higher (interglacials) 10Be concentrations. The sharp contrast of high and low 10Be concentrations at climatic stage boundaries are an independent proxy for climatic and sedimentary change in the Nordic Seas and can be applied for stratigraphic dating (10Be stratigraphy) of sediment cores from the northern North Atlantic and the Arctic Ocean.

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