Research Project
Grant-in-Aid for Scientific Research (B)
The objective of this study is to reconstruct variations in paleovegetation and terrestrial paleoenvironment by analyses of terrestrial plant-derived biomarkers and pollen/spore in sediment cores from Japan Sea off Hokkaido (U1422 and U1423 cores) collected by the International Ocean Drilling Program (IODP). We reconstructed the paleovegetation variations during ca. 4.3 million years and centurial-scale variations during ca. 700 kiloyears in U1423 and U1422 sites, respectively. The paleovegetation variations reconstructed by the coniferous diterpenoids and the triterpenoids derived by broad-leaved tree are synchronous to the global climatic variations such as warm/cool conditions with glacial/interglacial or centurial scales, elucidating paleoclimatic system variations related to monsoonal system in the northern Japan Sea by combined analyses of organic molecules and pollens.
本研究では植物テルペノイドと花粉を用いて過去数10万~数100万年オーダーの連続した海底堆積コアから古植生・古環境・古気候変動を復元した。本研究で復元した過去約450万年という期間は、人類史や全球的な温暖期から第四紀の寒冷期に移り行く寒冷化の気候環境変動史を俯瞰できる年代範囲である。その時間スケールの古植生・陸域古環境の年代変動を体系的に復元した研究例は世界的に見てもかなり少ない。また、北日本の植生帯は多様であり気候変動に敏感に応答するので、北太平洋(極東アジア)北部の過去約450万年間の古植生・陸域古環境データがはじめて提示できたことは有意義でインパクトの高い研究であると考える。
All 2021 2020 2019 2018 Other
All Journal Article (16 results) (of which Int'l Joint Research: 7 results, Peer Reviewed: 15 results, Open Access: 6 results) Presentation (50 results) (of which Int'l Joint Research: 14 results, Invited: 1 results) Remarks (4 results)
International Journal of Coal Geology
Volume: 233 Pages: 103643-103643
10.1016/j.coal.2020.103643
Quaternary International
Volume: 550 Pages: 27-38
10.1016/j.quaint.2020.03.011
Geochemistry, Geophysics, Geosystems
Volume: 21 Issue: 9
10.1029/2020gc009248
旧石器時代研究への視座「特集:4万年前以前日本列島に人類はいたのか」
Volume: 2 Pages: 8-10
Chemical Geology
Volume: 535 Pages: 119454-119454
10.1016/j.chemgeo.2019.119454
Researches in Organic Geochemistry
Volume: 35 Pages: 55-72
130007961978
Entomological Science
Volume: 22 Issue: 3 Pages: 270-274
10.1111/ens.12370
120006882086
Newsletters on Stratigraphy
Volume: 52 Issue: 3 Pages: 341-376
10.1127/nos/2019/0472
Atmospheric Environment
Volume: 196 Pages: 86-94
10.1016/j.atmosenv.2018.10.012
Volume: 34 Issue: 2 Pages: 37-45
10.20612/rog.34.2_37
130007607913
Volume: 34 Issue: 2 Pages: 15-28
10.20612/rog.34.2_15
130007607847
GEOCHEMICAL JOURNAL
Volume: 52 Issue: 4 Pages: e15-e20
10.2343/geochemj.2.0528
130007431374
Organic Geochemistry
Volume: 121 Pages: 89-103
10.1016/j.orggeochem.2018.04.008
Global and Planetary Change
Volume: 163 Pages: 1-9
10.1016/j.gloplacha.2018.02.001
Scientific Reports
Volume: 8 Issue: 1 Pages: 2196-2196
10.1038/s41598-018-20741-2
120007134458
Volume: 8 Issue: 1 Pages: 14070-14070
10.1038/s41598-018-31004-5
https://www.ep.sci.hokudai.ac.jp/~sawadak
https://www.ep.sci.hokudai.ac.jp/~mmgc