Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Minoru Ikehara"'
Autor:
Youngsook Huh, Inah Seo, Sunhwa Bang, Boo-Keun Khim, Hiroyuki Takata, Minoru Ikehara, Kiseong Hyeong, Hyen-Goo Cho
Publikováno v:
Ocean Science Journal. 57:324-333
We reconstructed the past deep-water character of the equatorial Indian Ocean using the isotope ratio of neodymium (εNd) in the Fe–Mn coating of mixed-species foraminifera. When compared with previous εNd records at the same site (ODP 758) and at
Publikováno v:
Scientific Reports
Microfossils are a powerful tool in earth sciences, and they have been widely used for the determination of geological age and in paleoenvironmental studies. However, the identification of fossil species requires considerable time and labor by expert
Autor:
Toshitsugu Yamazaki, Takuya Sagawa, Tsuyoshi Ishikawa, Yusuke Yokoyama, Kaoru Kubota, Minoru Ikehara
Publikováno v:
Scientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
Scientific Reports
Scientific Reports
The ocean may have played a central role in the atmospheric pCO2 rise during the last deglaciation. However, evidence on where carbon was exchanged between the ocean and the atmosphere in this period is still lacking, hampering our understanding of g
Autor:
Katsuto Uehara, Yusuke Yokoyama, Takeshige Ishiwa, Minoru Ikehara, Yosuke Miyairi, Stephen P Obrochta, Jun'ichi Okuno
Publikováno v:
Scientific Reports, Vol 9, Iss 1, Pp 1-8 (2019)
Scientific Reports
Scientific Reports
Further understanding of past climate requires a robust estimate of global ice volume fluctuations that in turn rely on accurate global sea-level reconstructions. An advantage of Marine Isotope Stage 2 (MIS 2) is the availability of suitable material
Publikováno v:
Scientific Reports, Vol 9, Iss 1, Pp 1-8 (2019)
Scientific Reports
Scientific Reports
The mechanisms driving the variations in the centennial-scale East Asian summer monsoon (EASM) remain unclear. Here, we use the δ18O records from adult ostracode shells to reconstruct the EASM variations over the last 3 kyrs in southwestern Japan. A
Publikováno v:
Geo-Marine Letters. 36:353-360
Modern North Pacific intermediate water (NPIW) is formed in the mixed water region where the Oyashio and Kuroshio currents meet. The source for cooling and freshening of NPIW is intermediate water in the Okhotsk Sea. The Okhotsk intermediate water ou
Publikováno v:
Scientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
Scientific Reports
Scientific Reports
Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ15N values of bulk sediments collected at Site U1456 of the International Ocean Discovery Progr
Autor:
Tomoya Abe, Tetsuya Shinozaki, Shigehiro Fujino, Kazuhisa Goto, Toru Tamura, Yuki Sawai, Daisuke Sugawara, Minoru Ikehara
Publikováno v:
Natural Hazards. 77:445-460
To determine how and what kind of marine-sourced biomarkers are transported and deposited on land by tsunami, we collected and analyzed samples of the 2011 Tohoku-oki tsunami deposits and the underlying and overlying soil at Sendai and Odaka, in nort
Autor:
Osamu Seki, Ellen E Martin, Chandranath Basak, Jonaotaro Onodera, Kimitaka Kawamura, Tatsuhiko Sakamoto, Keiji Horikawa, Minoru Ikehara, Saburo Sakai
Publikováno v:
Nature Communications
Warming of high northern latitudes in the Pliocene (5.33–2.58 Myr ago) has been linked to the closure of the Central American Seaway and intensification of North Atlantic Deep Water. Subsequent cooling in the late Pliocene may be related to the eff
Autor:
Kozo Takahashi, Osamu Seki, Minoru Ikehara, Yusuke Okazaki, Takeshi Nakatsuka, Tatsuhiko Sakamoto
Publikováno v:
Journal of Oceanography. 62:639-648
Cycladophora davisiana, a radiolarian species dwelling at mesopelagic depths, is known as a representative glacial fauna due to its unique distribution during glacial periods. In the present ocean, abundant production of C. davisiana is only observed