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Climate reconstruction based on GDGT-based proxies in a paleosol sequence in Japan: Postdepositional effect on the estimation of air temperature

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Title: Climate reconstruction based on GDGT-based proxies in a paleosol sequence in Japan: Postdepositional effect on the estimation of air temperature
Authors: Yamamoto, Yasuto Browse this author
Ajioka, Taku Browse this author
Yamamoto, Masanobu Browse this author →KAKEN DB
Keywords: GDGT
MBT/CBT
Paleotemperature
Japan
Holocene
Issue Date: 19-Mar-2016
Publisher: Elsevier
Journal Title: Quaternary international
Volume: 397
Start Page: 380
End Page: 391
Publisher DOI: 10.1016/j.quaint.2014.12.009
Abstract: We investigated branched and isoprenoid glycerol dialkyl glycerol tetraethers (GDGTs) in surface soils and a paleosol sequence to understand the effects of environmental and postdepositional factors on branched GDGT composition in different soil types and to reconstruct the past changes in the mean annual air temperature (MAAT) in southwestern Japan during the last 15 ka. The estimated MAAT was overestimated by 6 degrees C and 2 degrees C when the global and regional soil calibrations were applied, respectively. Additionally, the estimated MAAT increased downward by a maximum of 4 degrees C in the upper 30 cm of the soil sequence. This is likely to reflect the addition of newly produced branched GDGTs in subsurface soils. The estimated MAATs in a paleosol sequence are thus similar to 10 degrees C and similar to 6 degrees C higher than those expected when the global and regional soil calibrations were applied, respectively, but the variation agrees with the Holocene variation in the MAAT estimated by the pollen assemblage. This indicates that the MBT'/CBT-derived MAAT is biased, but the variation reflects the past changes in MAAT. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.
Rights: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/68501
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 正伸

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