A 36 kyr geochemical record from the Sea of Japan of organic matter flux variations and changes in intermediate water oxygen concentrations

J Crusius*, TF Pedersen, SE Calvert, GL Cowie, T Oba

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Intervals of organic C- and carbonate-rich laminated sediments occur in the Sea of Japan with roughly the same frequency as temperature changes observed in Greenland ice cores, providing clear evidence of rapid oceanographic change during the past 36 kyr. Planktonic foraminiferal delta(18)O data suggest that only the laminated sediments deposited during the Last Glacial Maximum (LGM), and perhaps one other interval formed during a period of increased water column stratification. Sedimentary Re and Mo data are consistent with bottom waters that were sulfidic during the LGM and suboxic during other laminated intervals. Results of a numerical model of C-org and Re burial are consistent with a mechanism whereby an increased C-org flux to the seafloor drove oxygen concentrations toward depletion during times of deposition of the suboxic laminated intervals. Such a process could have resulted from increased upwelling driven either by increased deep water formation due to colder and/or more saline surface waters or by stronger northeasterly monsoonal winds.

Original languageEnglish
Pages (from-to)248-259
Number of pages12
JournalPaleoceanography
Volume14
Issue number2
Publication statusPublished - Apr 1999
EventMinisymposium on Japan Sea - A Case Study of High-Frequency Oceanographic Variability in the Late Quaternary - VANCOUVER, Canada
Duration: 1 Jan 1995 → …

Keywords

  • YOUNGER DRYAS EVENT
  • MARINE-SEDIMENTS
  • NORTHEAST PACIFIC
  • GREENLAND ICE
  • BLACK-SEA
  • RED CLAY
  • DIAGENESIS
  • CARBON
  • OCEAN
  • MOLYBDENUM

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