Mercury content in Atlantic sediments as a new indicator of the enlargement and reduction of Northern Hemisphere ice sheets

I. Kita, T. Yamashita, S. Chiyonobu, H. Hasegawa, T. Sato, Yoshihiro Kuwahara

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

抄録

The total mercury content of Quaternary sediments over the last 1.1Ma from IODP Site U1308 drilled in the North Atlantic Ocean has changed, varying with periodicities of 100000 and 41000 years. The Hg content of the sediment increased during glacial periods, associated with increases in ice-rafted debris (IRD), and correlates positively with the total organic carbon (TOC) content and inversely with the absolute abundance of surface-dwelling nannoplankton species. TOC/total nitrogen ratios and δ13Corg values of TOC indicate that the TOC deposited during glacial periods was marine and associated with increased Hg deposition. These observations suggest that marine Hg is incorporated into the organic matter produced by deep-dwelling phytoplankton in the lower photic zone. Mercury- and IRD-bearing icebergs flowed out to this area during glacial periods melt, increasing the Hg content of photic water, and depositing IRD on the ocean floor, where increased marine Hg during glacial periods was consumed by deep-dwelling phytoplankton. Therefore, the change in the sediment Hg content from the North Atlantic Ocean is controlled by climatic change and can be used as a chemical indicator of Northern Hemisphere ice sheet variability.

元の言語英語
ページ(範囲)167-177
ページ数11
ジャーナルJournal of Quaternary Science
31
発行部数3
DOI
出版物ステータス出版済み - 4 1 2016

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ice-rafted debris
total organic carbon
ice sheet
Northern Hemisphere
sediment
phytoplankton
photic zone
nanoplankton
iceberg
periodicity
seafloor
melt
organic matter
climate change
mercury
indicator
Sediment
Enlargement
Hemisphere
nitrogen

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

これを引用

Mercury content in Atlantic sediments as a new indicator of the enlargement and reduction of Northern Hemisphere ice sheets. / Kita, I.; Yamashita, T.; Chiyonobu, S.; Hasegawa, H.; Sato, T.; Kuwahara, Yoshihiro.

:: Journal of Quaternary Science, 巻 31, 番号 3, 01.04.2016, p. 167-177.

研究成果: ジャーナルへの寄稿記事

Kita, I. ; Yamashita, T. ; Chiyonobu, S. ; Hasegawa, H. ; Sato, T. ; Kuwahara, Yoshihiro. / Mercury content in Atlantic sediments as a new indicator of the enlargement and reduction of Northern Hemisphere ice sheets. :: Journal of Quaternary Science. 2016 ; 巻 31, 番号 3. pp. 167-177.
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