The first trans-Arctic 14C section: Comparison of the mean ages of the deep waters in the Eurasian and Canadian basins of the Arctic Ocean

Peter Schlosser, Bernd Kromer, Brenda Ekwurzel, Gerhard Bönisch, Ann McNichol, Robert Schneider, Karl Von Reden, H. G. Östlund, J. H. Swift

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

We present Δ14C data collected during three cruises to the Arctic Ocean that took place in the summers of 1987 (POLARSTERN cruise ARK IV/3), 1991 (ARCTIC 91 Expedition), and 1994 (Arctic Ocean Section 94). The cruise tracks of these three expeditions cover all major basins of the Arctic Ocean (Nansen, Amundsen, Makarov and Canada basins), and can be combined to a trans-Arctic section reaching from the Barents Sea slope to the southern Canada Basin just north of Bering Strait. The section is based on 17 stations covering the entire water column (about 250 data points). The combined Δ14C data set was produced from a mixture of large volume samples measured by low-level counting and small volume samples measured by Accelerator Mass Spectrometry (AMS). We use the Δ14C section, together with previously published Δ14C data from single stations located in several basins of the Arctic Ocean, to derive mean "ages" (isolation times) of the deep waters in the Arctic Ocean. We estimate these mean "ages" to be ≈ 250 years in the bottom waters of the Eurasian Basin and ≈ 450 years in the Canadian Basin Deep Water. A remarkable feature of the Δ14C section is the homogeneity in the 14C distribution observed in the deep Canadian Basin. Within the measurement precision of about ±2‰ (LV) to about ±5‰ (AMS), we cannot detect significant horizontal or vertical Δ14C gradients below 2000 m depth between the northern boundary of the Makarov Basin and the southern margin of the Canada Basin. There is no statistically significant difference between samples measured by AMS and by low-level counting.

Original languageEnglish (US)
Pages (from-to)431-437
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume123
Issue number1-4
DOIs
StatePublished - Mar 1997
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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