Takashi Ohsumi

Central Research Institute of Electric Power Industry

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Ziqiu Xue

Research Institute of Innovative Technology for the Earth

Kiminori Shitashima

Tokyo University of Marine Science and Technology

Masao Sorai

Geological Survey of Japan

Xiaochun Li

Institute of Rock and Soil Mechanics

Hitoshi KOIDE

Suwa Red Cross Hospital

Jun Kita

Marine Ecology Research Institute

Yasuhiro Yamanaka

Hokkaido University

Michimasa Magi

Research Institute of Innovative Technology for the Earth

Yoshiaki Maeda

University of Tsukuba

Norikazu Nakashiki

Central Research Institute of Electric Power Industry

Cooperative Institutions

Research Institute of Innovative Technology for the Earth

The University of Tokyo

Kyoto University

National Institute of Advanced Industrial Science and Technology

Japan Science and Technology Agency

Hokkaido University

Kyushu University

Central Research Institute of Electric Power Industry

Tokyo Institute of Technology

Japan Agency for Marine-Earth Science and Technology

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Natural emissions of CO2 from the geosphere and their bearing on the geological storage of carbon dioxide

Energy (2006)

Steven W Holloway Julian A. Pearce V. Hards Takashi Ohsumi John Gale

10.1016/j.energy.2006.09.001

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Citations (134)

Experimental studies of CO2-rock interaction at elevated temperatures under hydrothermal conditions

GEOCHEMICAL JOURNAL (2005)

Akira Ueda Koichi Kato Takashi Ohsumi Tatsuya Yajima Hisatoshi Ito

Experiments on CO2-water-rock interaction at hydrothermal temperatures have been performed to investigate dissolution and precipitation phenomena, including Ca extraction from rocks that might occur during CO2 sequestration into geothermal fields. Distilled water samples were exposed to a CO2 atmosphere at a temperature of 25°C and pressures up to 6 MPa. The resulting solutions were then reacted with granodiorite samples from the Ogachi hot/dry rock field and labradorite, at 200°C and 120°C respectively. The calcium concentrations in the solutions that had reacted with CO2 were twice those with N2 instead of CO2. Combined with the results of thermodynamic calculations, these observations indicate that calcium can be released from rocks (silicates) easily and might be removed as CaCO3 and/or CaSO4 during CO2 sequestration into geothermal fields.

Distilled water

10.2343/geochemj.39.417

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Citations (99)

Dispersion of CO2 injected into the ocean at the intemediate depth

Energy Conversion and Management (1997)

Norikazu Nakashiki Takashi Ohsumi

Marine ecosystem

10.1016/s0196-8904(96)00294-4

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Citations (15)

Applicability of Estimating Method of Soilwater and Groundwater Percolation by Isotopic Composition

Journal of Groundwater Hydrology (1993)

Hideshi Ikeda Yoichi Miyanaga Takashi Ohsumi

In order to estimate a long term chemical change of groundwater and streamwater by acid deposi-tion, it is necessary to know both the pathway and concurrent chemical change of precipitation in a watershed. We observed temporal variations in the chemistry and isotopic composition of the ground-water and streamwater in a mountainous watershed during a storm. Based on these observations, we divided groundwater and streamwater into 3 components; precipitation, soilwater, and groundwater. By reproduction of streamwater and groundwater chemistry using this result, this separation method is proved to be effective for making a prediction model of streamwater and groundwater caused by acid deposition. Key words : Acid Deposition, Isotopic Composition, Streamwater and Groundwater Chemistry, Runoff components

Deposition

Acid rain

10.5917/jagh1987.35.95

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Citations (1)

Nanoscale surface observation of feldspar dissolved under supercritical CO2–water–mineral system

Energy (2004)

Masao Sorai Takashi Ohsumi Masamichi Ishikawa

Anorthite

10.1016/j.energy.2003.10.024

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Citations (21)

A Hybrid Numerical Model of LCO2 and CO2 Enriched Seawater Dynamics in the Ocean Induced by Moving-Ship Releasing

Elsevier eBooks (2003)

Baixin Chen Yongchen Song Mizuho Nishio Makoto Akai Takashi Ohsumi

10.1016/b978-008044276-1/50122-7

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Citations (1)

An experimental study on seismic monitoring of a CO2 flooding in two sandstones

Energy (2004)

Ziqiu Xue Takashi Ohsumi Hitoshi KOIDE

Hydrostatic equilibrium

Core sample

Hydrostatic pressure

Hydrostatic test

10.1016/j.energy.2004.07.022

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Citations (21)

A numerical study with an eddy-resolving model to evaluate chronic impacts in CO2 ocean sequestration

International journal of greenhouse gas control (2007)

Yoshio Masuda Yasuhiro Yamanaka Yoshikazu Sasai Michimasa Magi Takashi Ohsumi

Large-Eddy Simulation

10.1016/s1750-5836(07)00039-4

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Citations (6)

Preface

Journal of Oceanography (2004)

Yoshihisa Shirayama Kazuhiro Kogure Peter G. Brewer Takashi Ohsumi Joji Ishizaka

10.1007/s10872-004-0972-0

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Citations (2)

Geochemical cycle of carbon and deep-sea injections of fossil-fuel CO2.

Journal of the Fuel Society of Japan (1991)

Takashi Ohsumi

The classic “Urey reactions”CaSiO3+CO2→←CaCO3+SiO2controls the level of atmospheric CO2 over geologic time scales. The stoichiometry expressed asCa2++2HCO3-→CaCO3+CO2+H2Oexplains clearly the direct effect of the coral reef growth on the atmospheric CO2 concentration: the short-term increase in CO2 level will be resulted. Deep-sea injections of fossil-fuel CO2 are the most feasible strategies to mitigate the climatic impact of global warming.The pH of the ambient seawater around the liquid CO2 lake at a 3000m depth will be lowered to 3.3, possibly making serious influence on the sea-floor ecosystem. Biogenic calcareous ooze can be act as the in-situ neutralizer while the pH-lowered seawater crawlingly spreads out on the ocean floor.

Ocean Acidification

Seabed

Marine ecosystem

10.3775/jie.70.225

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Citations (1)