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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2016-529
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-2016-529
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 19 Dec 2016

Submitted as: research article | 19 Dec 2016

Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The revised manuscript was not accepted.

Glycerol dialkyl glycerol tetraether variations in the northern Chukchi Sea, Arctic Ocean, during the Holocene

Yu-Hyeon Park1,a, Masanobu Yamamoto1,2, Leonid Polyak3, and Seung-Il Nam4 Yu-Hyeon Park et al.
  • 1Graduate School of Environmental Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo 060-0810, Japan
  • 2Faculty of Environmental Earth Science, Hokkaido University, Kita-10, Nishi-5, Kita-ku, Sapporo 060-0810, Japan
  • 3Byrd Polar and Climate Research Center, The Ohio State University, 43210, Columbus, USA
  • 4Division of Polar Paleoenvironment, Korea Polar Research Institute, 26 Songdomiraero, Yeonsu-gu, Incheon 21990, Republic of Korea
  • aPresent Address; Department of oceanography, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea

Abstract. Glycerol dialkyl glycerol tetraethers (GDGTs) have become a useful tool in paleoclimate research in ocean environments, but their applications in the Arctic are yet to be developed. GDGTs were analyzed in three sediment cores from the northern/northeastern margin of the Chukchi Sea to test the applicability of GDGT proxies for reconstructing sea surface temperature and sea-ice variability in the Holocene. Interpretation was enabled by an earlier investigation of GDGT composition in surface sediments from the study area. Low GDGT concentrations and high BIT and CBT values in core sediments older than ca. 8 ka probably indicate heavy sea-ice conditions in combination with terrestrial inputs during deglaciation and incomplete sea-level rise. Higher concentrations of isoprenoid GDGTs after ca. 8 ka, consistent with an increase in total organic carbon and some other biogenic proxies, are interpreted to represent increased primary production combined with elevated sedimentation rates. These patterns were likely controlled by sea-ice conditions and variations in Pacific water inflow. Geographic heterogeneity in these processes is indicated by differences in GDGTs distribution patterns between cores across the Chukchi margin. TEX86 and TEX86L indices potentially indicative of sea surface temperatures appear to show millennial-scale variability, but the controls on these fluctuations are yet to be understood.

Yu-Hyeon Park et al.
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Interactive discussion
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Yu-Hyeon Park et al.
Yu-Hyeon Park et al.
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Short summary
The analysis of microbial lipid (GDGTs) in three sediment cores from the northern Chukchi Sea margin provides insights into GDGTs production, sources and SST in this region of the Arctic during the Holocene. Different patterns in GDGTs distribution between cores may indicate spatial differences in the pathways of Pacific waters and sea-ice extent. TEX86 and TEX86L indices potentially useful for SST reconstruction show millennial-scale variability, but the controls are not well understood.
The analysis of microbial lipid (GDGTs) in three sediment cores from the northern Chukchi Sea...
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