Zobrazeno 1 - 10
of 178
pro vyhledávání: '"Minoru Ikehara"'
Autor:
Hiroyuki Takata, Minoru Ikehara, Koji Seto, Hirofumi Asahi, Hyoun Soo Lim, Sangmin Hyun, Boo-Keun Khim
Publikováno v:
Progress in Earth and Planetary Science, Vol 11, Iss 1, Pp 1-18 (2024)
Abstract The mid-Brunhes dissolution interval (MBDI; Marine Isotope Stage (MIS) 13 to 7; ~ 533–191 ka) is characterized by various paleoclimatic/paleoceanographic events in the world. We investigated fossil deep-sea benthic foraminifera and sedimen
Externí odkaz:
https://doaj.org/article/702ed4ae63ef4acc8c0999e47cba7862
Autor:
Shoko Sakata, Mayuri Inoue, Yasuaki Tanaka, Takashi Nakamura, Kazuhiko Sakai, Minoru Ikehara, Atsushi Suzuki
Publikováno v:
Frontiers in Marine Science, Vol 11 (2024)
Although biogenic carbonates, such as foraminifera and coccolithophorids, are valuable tools for reconstructing past environments, scleractinian corals also offer environmental data from tropical to subtropical regions with a higher time resolution.
Externí odkaz:
https://doaj.org/article/119e215ab8ba478182a8d826e794bfb8
Autor:
Mutsumi Iizuka, Osamu Seki, David J. Wilson, Yusuke Suganuma, Keiji Horikawa, Tina van de Flierdt, Minoru Ikehara, Takuya Itaki, Tomohisa Irino, Masanobu Yamamoto, Motohiro Hirabayashi, Hiroyuki Matsuzaki, Saiko Sugisaki
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-10 (2023)
Abstract The Last Interglacial (LIG: 130,000–115,000 years ago) was a period of warmer global mean temperatures and higher and more variable sea levels than the Holocene (11,700–0 years ago). Therefore, a better understanding of Antarctic ice-she
Externí odkaz:
https://doaj.org/article/b648fa9dec074ea7b3f62d4bf0631844
Publikováno v:
Progress in Earth and Planetary Science, Vol 10, Iss 1, Pp 1-15 (2023)
Abstract It is necessary to purify diatom frustules by taxon to perform accurate geochemical analyses of diatom fossils preserved in sediments. However, the small size of diatoms has hitherto prevented taxon-specific purification; therefore, previous
Externí odkaz:
https://doaj.org/article/8242dd5a5d70487ab53bd6d83b9c9f5a
Autor:
Tetsuya Shinozaki, Yuki Sawai, Minoru Ikehara, Dan Matsumoto, Yumi Shimada, Koichiro Tanigawa, Toru Tamura
Publikováno v:
Progress in Earth and Planetary Science, Vol 9, Iss 1, Pp 1-10 (2022)
Abstract The distributions of sandy tsunami deposits do not reflect the true extents of tsunami inundation areas, leading to underestimates of inundation by past tsunamis and thus the magnitudes of their associated tsunamigenic earthquakes. To archiv
Externí odkaz:
https://doaj.org/article/a50698dcfaab40b2bf7c55bc2d08cc61
Autor:
Kaoru Kubota, Rosaaideihn Tanabe, Minoru Ikehara, Yukiko Kozaka, Koji Seike, Yosuke Miyairi, Yusuke Yokoyama
Publikováno v:
Data in Brief, Vol 46, Iss , Pp 108797- (2023)
A precise age model of marine sediment core is crucial for environmental studies of the past such as paleoceanography, paleoclimatology, and paleo-hazard studies. Here the geochemical dataset is described that is used to determine the age model of ma
Externí odkaz:
https://doaj.org/article/46962789e9d0485a8726c6c2cf683063
Autor:
Jongmin Lee, Sunghan Kim, Minoru Ikehara, Keiji Horikawa, Yoshihiro Asahara, Chan Min Yoo, Boo-Keun Khim
Publikováno v:
Geoscience Frontiers, Vol 14, Iss 1, Pp 101483- (2023)
The orbital-scale variability of the Indian summer monsoon (ISM) has been influenced by multiple factors, such as atmospheric CO2 concentration, global ice volume, and insolation. Proxies for weathering activity and paleo-productivity provide potenti
Externí odkaz:
https://doaj.org/article/aeb78b15ddde4e90b9d068ea2741addb
Publikováno v:
Frontiers in Climate, Vol 4 (2022)
Coral geochemical tracers have been used in studies of the paleoclimatology and paleoceanography of the tropics and subtropics. We measured Sr/Ca and oxygen isotope ratios (δ18O) in a coral sample collected from the southern part of Lombok Strait, a
Externí odkaz:
https://doaj.org/article/ddab320a5fde4d97980131befcd8274a
Autor:
Yuying Zhang, Limin Hu, Yonghua Wu, Zhi Dong, Zhengquan Yao, Xun Gong, Yanguang Liu, Minoru Ikehara, Xuefa Shi
Publikováno v:
Frontiers in Earth Science, Vol 10 (2022)
The carbon cycle on the Earth’s surface is linked to long-term variations in atmospheric CO2 as well as carbon sequestration in various pools. The burial of particulate organic carbon (OC) in marine sediments is also highly sensitive to the global
Externí odkaz:
https://doaj.org/article/8a430fea16e545ae98d78247ad7b62af
Autor:
Yuki Morono, Motoo Ito, Tatsuhiko Hoshino, Takeshi Terada, Tomoyuki Hori, Minoru Ikehara, Steven D’Hondt, Fumio Inagaki
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-9 (2020)
The discovery of aerobic microbial communities in nutrient-poor sediments below the seafloor begs the question of the mechanisms for their persistence. Here the authors investigate subseafloor sediment in the South Pacific Gyre abyssal plain, showing
Externí odkaz:
https://doaj.org/article/60168f65ac9e4caf9cbce09bff711b44