SOHMA Akio

写真a

Search Institutional Repository


Title

Professor

Laboratory location

Sugimoto Campus

Research Areas 【 display / non-display

Ecosystem modeling, Aquatic Ecosystem Engineering, Social Ecosystem

Research subject summary 【 display / non-display

  • Promoting research with the theme of establishing ecological-social systems harmonized with aquatic environment - industrial economy - social culture based on two viewpoints, i.e., (1) interdisciplinary research to create new discoveries and values and (2) practical research useful in policies, plans and projects, In interdisciplinary research, we are exploring the mechanism, estimation and prediction for the ecosystem functions and biodiversity in the hydrosphere. In practical research, developing a science-based communication platform that contributes to the formulation of policies, plans and projects aimed at preserving and utilizing hydrosphere environment / ecosystem.

Research Interests 【 display / non-display

Numerical modeling, facilitation, Ecosystem, Aquatic Environment, Climate change

Research Career 【 display / non-display

  • Research on conservation and utilization of coastal ecosystem and construction of environmentally harmonious social system

    (Collaboration in Organization) Project Year :

    1996
    -
    Today

    Keyword in research subject:  hypoxia, tidal flat ecosystem, nutrients cycle, biodiversity, numerical modeling

  • Research on mitigation and application capability of aquatic ecosystems for climate change

    (Collaboration in Japan) Project Year :

    2004.04
    -
    Today

    Keyword in research subject:  Blue carbon, Carbon cycle, Numerical model

Education summary 【 display / non-display

  • Mathematical science, Mathematical modeling, Environmental ecology, Aquatic ecosystem engineering, Complex system

Association Memberships 【 display / non-display

  • American Geophysical Union

  • Japan Society of Civil Engineers

  • Japan Society on Water Environment

  • The Physical Society of Japan

  • Advanced Marine Science and Technology Society

Committee Memberships 【 display / non-display

  • 2019.04
    -
    Today

    Advanced Marine and Science Technology   Director

  • 2004
     
     

    International Marine Environmental Modeling Seminar 2004   Session Co Chair Person

  • 2002
     
     

    International Marine Environmental Modeling Seminar 2002   Session Chair Person

  • 2001.04
     
     

    Journal Reviewer   Reviewer

Awards & Honors 【 display / non-display

  • The Hotta Memorial Encouragement Award, the Advanced Marine Science and Technology Society

    2007  

Current Career 【 display / non-display

  • Osaka City University   Graduate School of Engineering   Urban Engineering Course   Professor  

Career 【 display / non-display

  • 2019.04
    -
    Today

    Osaka City University   Graduate School of Engineering   Head of the Center for Urban Socio-Ecological Systems (CUES)

  • 2016.04
    -
    Today

    Osaka City University   Engineering   Professor

  • 2014
    -
    2016

    Mizuho Info. and Res Institute   Management & IT Consulting Div.   Research Director

  • 2010
    -
    2014

    Mizuho Information and Research Institute   Env. and Energy Div.1   Research Director

  • 2005
    -
    2009

    Mizuho Info. & Res. Inst.   Env., Natural Resources and Energy Div.   Principal Researcher/Senior Researcher

display all >>

Graduate School 【 display / non-display

  •  
     
     

    Aoyama Gakuin University  Graduate School, Division of Science and Engineering  Physics 

 

Published Papers 【 display / non-display

  • Ecosystem functions in urban coastal areas– Considering our vision by ecosystem modeling

    Japan Society for Impact Assessment, Impact Assessment  18 ( 1 ) 33 - 38 2020  [Invited]

    DOI CiNii

  • ANNUAL VARIATION OF AIR-SEA CO2 FLUX AT THE RIVER MOUTH AREA AND ITS FACTORS -ANALYSIS OF AN ECOSYSTEM MODEL, EMAGIN_B.C.-

    SOHMA Akio, NAKAI Mizuki, KUBO Atsushi, KUWAE Tomohiro

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)  74 ( 2 ) I_1267 - I_1272 2018.10  [Refereed]

     View Summary

    &nbsp;The carbon capture and storage in the coastal shallow ecosystem is a hot topic because of its high potential. The release and uptake of atmospheric CO<sub>2</sub> at the air-sea boundary is an important element consisting the series of carbon capture and storage of the shallow waters. In this study, we applied an ecosystem model, EMAGIN_B.C., considering carbonate chemistry, food-web, and Carbon-Nutrients-Oxygen cycling in the benthic-pelagic coupled system to Tokyo Bay, and analyzed the dynamics of air-sea CO<sub>2</sub> flux and its factors especially focusing on the river mouth area. As the result of the model analysis, CO<sub>2</sub> was released from the ocean to air at the river mouth area on an annual average basis, although CO<sub>2</sub> was taken up at other areas in Tokyo Bay. In addition, the CO<sub>2</sub> release and CO<sub>2</sub> uptake are repeated in the period from the end of April to the end of November. The CO<sub>2</sub> absorption period is thought to be dominated by the consumption of DIC by photosynthesis, and the release period is thought to be dominated by consumption of total alkalinity by nitrification.

    DOI CiNii

  • ECOSYSTEM MODEL STUDY ON LONG-TERM DYNAMICS OF DISSOLVED OXYGEN AND ITS FACTORS AT THE BOTTOM WATER IN TOKYO BAY

    SOHMA Akio, HARUTA Takuro

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)  74 ( 2 ) I_1273 - I_1278 2018.10  [Refereed]

     View Summary

    &nbsp;Hypoxia has been improving throughout Tokyo Bay, however, there are still seriously hypoxic areas. In this study, we analyzed the secular change of dissolved oxygen (DO) and consumption mechanism of the sea-floor due to reduction of nutrients and COD inflow from the land from 1979 to 2009, using the benthic-pelagic coupled ecosystem model, EMAGIN-H.P. As a result, the model demonstrated that there were at least three types of areas: zone A, in which DO increases; zone B, in which DO turns from a decrease to an increase; and zone C, where DO decreases. In addition, reduction of nutrients and COD inflow leads to (1) decrease of reduced substances (Mn<sup>2+</sup>, Fe<sup>2+</sup>, S<sup>2-</sup>) and increase of benthic fauna due to improvement of hypoxia at zone A, (2) decrease of reduced substances due to DO increase and decrease of benthic fauna due to food shortage at zone C, and (3) increase of benthic fauna until 1994 with the improvement of hypoxia and then a decrease due to food shortage at zone B. These results show that the optimal amount of nutrients and COD inflow in view of both the increase of benthic fauna and the improvement of hypoxia differs from area to area.

    DOI CiNii

  • Modeling a coastal ecosystem to estimate climate change mitigation and a model demonstration in Tokyo Bay

    Akio Sohma, Hisashi Shibuki, Fumiyuki Nakajima, Atsushi Kubo, and Tomohiro Kuwae

    Ecological Modelling   384   261 - 289 2018.07  [Refereed]

    DOI

  • A NUMERICAL STUDY ON EFFECT OF INDUCING SLOW FLOW ON THE BOTTOM SEDIMENT ENVIRONMENT IN CLOSED WATER AREA

    SUKENAGA Hiroaki, SHIGEMATSU Takaaki, SOHMA Akio, YOSHIMURA Naotaka, HIRAI Ken

    Japan Society of Civil Engineers, Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)  73 ( 2 ) I_1333 - I_1338 2017.10  [Refereed]

    DOI CiNii

display all >>

Books etc 【 display / non-display

  • Blue Carbon in Shallow Coastal Ecosystems, Carbon Dynamics, Policy, and Implementation.,Chapter 11: "CO2 Uptake in the Shallow Coastal Ecosystems Affected by Anthropogenic Impacts."

    Tomohiro Kuwae, Jota Kanda, Atsushi Kubo, Fumiyuki Nakajima, Hiroshi Ogawa, Akio Sohma, Masahiro Suzumura (Part: Contributor )

    Springer  2018.09

  • "Estuaries: Classification, Ecology, and Human Impacts” , Chapter 10: Modeling an Estuarine Ecosystem: How Tidal Flats and Benthic Ecosystems Affect the Eutrophic Estuary

    Akio Sohma (Part: Single Work )

    Nova Science Publishers  2015.01

  • Ecosystem Modeling and its Application for Seagrass Beds

    Akio Sohma (Part: Single Work )

    Nova Science Publishers  2011.03

  • Water Purification, Chapter 2: "Paradigm Shift from a Clean Ocean to a Bountiful Ocean -An essential vision revealed by ecological modeling of tidal flats - central bay area coupling and benthic-pelagic ecosystem coupling -

    (Part: Single Work )

    Nova Science Publishers  2009.12

Conference Activities & Talks 【 display / non-display

  • Modelling the life cycles of harmful diatoms and its application to the benthic-pelagic coupled ecosystem model, to reveal the mechanisms of the bleaching in aquacultured nori

    Akio SOHMA, Riku IMADA, Tetsuya NISHIKAWA, Hisashi SHIBUKI

    The International Society for Ecological Modelling, Global Conference 2019  (Salzburg Congress, Zalzburg, Austria)  2019.10  The international society for ecological modelling

  • The estimation of CO2 flux in Japanese coastal ecosystems using a numerical model

    Hirotada Moki, Akio Sohma, Hisashi Shibuki, Kenji Toyoda, Anirban Akhand, Kenta Watanabe, Tatsuki Tokoro, Tomomi Inoue, Hiroya Yamano, Masayuki Banno, Yasuyuki Nakagawa, Hiroyuki Matsuda, Tomohiro Kuawe

    第34回個体群生態学会  2018.10 

  • Connectedness between Numerical Modeling and Coastal Environmental Problems ~ History and Prospects ~

    Akio Sohma  [Invited]

    2018.09 

  • Connectedness between Numerical Modeling and Coastal Environmental Problems ~ History and Prospects ~

    Akio Sohma  [Invited]

    Lecture Notes of the 54rd Summer Seminar on Hydraulic Engineering, 2018, Course B  2018.09 

  • The estimation of CO2 flux in subtropical coastal ecosystems using a numerical model

    Hirotada MOKI, Akio SOHMA, Hisashi SHIBUKI, Kenji TOYODA, Anirban AKHAND, Kenta WATANABE, Tatsuki TOKORO, Tomomi INOUE, Hiroya YAMANO, Masayuki BANNO, Yasuyuki NAKAGAWA, Hiroyuki MATSUDA, Tomohiro KUAWE

    日本地球惑星科学連合2018年大会  2018.05 

display all >>

Grant-in-Aid for Scientific Research 【 display / non-display

  • Development of a blue carbon ecosystem model to reveal carbon capture and storage function in urban shallow waters

    Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2018.04
    -
    2021.03
     

Other external funds procured 【 display / non-display

  • Research for Climate Change and Ecosystem Function

    System name: (Commissioned Project)  Representative

    Project Year :

    2017.05
    -
    2018.02

 

Charge of on-campus class subject 【 display / non-display

  • Environmental ecology

    (2019) University, Special course

  • Aquatic Ecology

    (2019) University, Special course

  • Geo Environmental Engineering

    (2019) University, Special course

  • Hydrosphere ecosystem engineering

    (2019) Graduate school, Special course

  • Transport phenomena

    (2019) University, Special course

display all >>

 

Social Contribution 【 display / non-display

  • Connectedness between Numerical Modeling and Coastal Environmental Problems ~ History and Prospects ~

    Role : Lecturer

     Audience : Graduate students, Teachers, Researchesrs, General, Scientific organization, Company, Civic organization, Governmental agency 

    2018.09
     
     

    Sponsor, Organizer, Publisher : Committee on Hydroscience and Hydraulic Engineering, Coastal Engineering Committee, JSCE  Lecture Notes of the 54rd Summer Seminar on Hydraulic Engineering, 2018, Course B