Climate control of sulfate influx to Lake Hovsgol, northwest Mongolia, during the last glacial-postglacial transition: Constraints from sulfur geochemistry

Fumiko Watanabe Nara, Takahiro Watanabe, Takeshi Kakegawa, Haruhiko Seyama, Kazuho Horiuchi, Toshio Nakamura, Akio Imai, Nobuyuki Kawasaki, Takayoshi Kawai

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Changes in sulfur cycles in Lake Hovsgol (northwest Mongolia) are discussed on the basis of total organic carbon (TOC), total sulfur (TS) concentrations and stable sulfur isotope ratios (δ34S) in two sediment cores (X104 and X106) covering the last glacial to the present. Correlation plots of TOC and TS (C-S plots) of the sediment cores indicate dissolved sulfate enrichment in sediment pore water and high sulfate reducing bacteria (SRB) activity during the climate transition from the last glacial to postglacial period (LG-PG transition, from ca. 21 to 11.6calka BP). In addition, positive shifts of δ34S values (from +3.7‰ to +32.6‰) were observed during the LG-PG transition. These results suggest a large influx of 34S-rich dissolved sulfate into the lake during this period. The 34S-rich dissolved sulfate may have accumulated on the shore (wetlands and marshes) of Lake Hovsgol during the last glacial period. Owing to the increase in atmospheric precipitation and lake level rise during the LG-PG transition, the 34S-rich dissolved sulfate may have been supplied from the shore to the lake. Increased sulfate influx during the LG-PG transition has also been observed in a Lake Baikal sediment core. Our new sulfur geochemical data shows past-environmental changes, particularly moisture changes, within continental Asia during the climate transition.

Original languageEnglish
Pages (from-to)278-285
Number of pages8
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume298
Issue number3-4
DOIs
Publication statusPublished - 2010 Dec 15

Keywords

  • Lake Hovsgol
  • Lake sediment
  • Last deglaciation
  • Mongolia
  • Sulfur cycle
  • δS

ASJC Scopus subject areas

  • Oceanography
  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes
  • Palaeontology

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