Miyako Sato
Japan Agency for Marine-Earth Science and Technology
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Featured researches published by Miyako Sato.
Environmental Pollution | 2018
Naoki Mori; Kenichiro Sugitani; Mariko Yamamoto; Rie Tomioka; Miyako Sato; Naomi Harada
Chemical compositions of streambed biofilms from a major river of central Japan (the Kushida River) were obtained, with data of associated sediments (fine-grained fractions < 63 μm) and dissolved components of waters, in order to provide preliminary information about biogeochemical significance of streambed biofilms. During the sampling period (July 31st to August 3rd, 2013), dissolved components of the river waters were influenced by the dam reservoir. Concentrations of NO3-, silica (as Si), SO42-, PO43- and Ca2+ decreased across the dam, whereas Fe and Mn increased across the dam, and then decreased downstream rapidly. Streambed biofilms contain significant amount of non-nutrient elements such as Al (up to 21% as Al2O3 on water and others-free basis), indicating that they are contaminated as siliciclatic (silt and clay) materials. Siliciclastic materials in the biofilms are basically compositionally similar to fine-grained (<63 μm) fractions of streambed sediments. However, some elements such as Ca, P, Mn, and Zn are markedly enriched in the biofilms. Particularly, Mn concentrations in the biofilm samples collected just below the dam reservoir are very high (∼4.0 wt %), probably due to accumulation from the discharged water. Concentrations of trace elements such as P, Cr, Cu, Zn and V appear to be controlled by amounts of Fe-oxides and/or Mn-oxides in biofilms. Numbers of factors are involved in controlling chemical compositions of streambed biofilms, including amount of contaminated siliciclastics, authigenic mineral formation, adsorption of dissolved materials and microbial metabolisms. As demonstrated by this study, systematic analyses including major elements and comparison with associated sediments and waters could reveal biogeochemistry of this complex system.
Geochimica et Cosmochimica Acta | 2006
Naomi Harada; Miyako Sato; Aya Shiraishi; Makio C. Honda
Deep-sea Research Part Ii-topical Studies in Oceanography | 2012
Naomi Harada; Miyako Sato; Osamu Seki; Axel Timmermann; Heiko Moossen; James Bendle; Yuriko Nakamura; Katsunori Kimoto; Yusuke Okazaki; Kana Nagashima; Sergey A. Gorbarenko; Akira Ijiri; Takeshi Nakatsuka; Laurie Menviel; Megumi O. Chikamoto; Ayako Abe-Ouchi; Stefan Schouten
Paleoceanography | 2008
Naomi Harada; Miyako Sato; Tatsuhiko Sakamoto
Global Biogeochemical Cycles | 2012
Naomi Harada; Miyako Sato; Kazumasa Oguri; Kyoko Hagino; Yusuke Okazaki; Kota Katsuki; Yoshinori Tsuji; Kyung-Hoon Shin; Osamu Tadai; Sei Ichi Saitoh; Hisashi Narita; Susumu Konno; Richard W. Jordan; Yoshihiro Shiraiwa; Jacqueline M. Grebmeier
Progress in Oceanography | 2014
Naomi Harada; Kota Katsuki; Mitsuhiro Nakagawa; Akiko Matsumoto; Osamu Seki; Jason A. Addison; Bruce P. Finney; Miyako Sato
Deep-sea Research Part Ii-topical Studies in Oceanography | 2012
Osamu Seki; Naomi Harada; Miyako Sato; Kimitaka Kawamura; Akira Ijiri; Takeshi Nakatsuka
Palaeogeography, Palaeoclimatology, Palaeoecology | 2014
Yusuke Okazaki; Katsunori Kimoto; Hirofumi Asahi; Miyako Sato; Yuriko Nakamura; Naomi Harada
Palaeogeography, Palaeoclimatology, Palaeoecology | 2013
Naomi Harada; Ulysses S. Ninnemann; Carina B. Lange; Margarita Marchant; Miyako Sato; Naokazu Ahagon; Silvio Pantoja
Geochemical Journal | 2013
Miho Fukuda; Naomi Harada; Miyako Sato; Carina B. Lange; Naokazu Ahagon; Hajime Kawakami; Wataru Miyashita; Silvio Pantoja; Takeshi Matsumoto; Isao Motoyama