Japan Geoscience Union Meeting 2016

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Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG15] Coastal Ecosystems - 2. Coral reefs, seagrass meadows, and mangroves

Tue. May 24, 2016 1:45 PM - 3:15 PM 301A (3F)

Convener:*Toshihiro Miyajima(Marine Biogeochemistry Group, Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, The University of Tokyo), Atsushi Watanabe(Department of Mechanical and Environmental Informatics Graduate School of Information Science and Engineering Tokyo Institute of Technology), Yu Umezawa(Nagasaki University), Chair:Toshihiro Miyajima(Marine Biogeochemistry Group, Division of Ocean-Earth System Science, Atmosphere and Ocean Research Institute, The University of Tokyo), Yoshiyuki TANAKA(Japan Agency for Marine-Earth Science and Technology Mutsu Institute for Oceanography)

2:00 PM - 2:15 PM

[ACG15-02] Net uptake of atmospheric CO2 in human-dominated estuarine and shallow coastal systems: empirical studies and the ecosystem modeling

*Tomohiro Kuwae1, Jota Kanda2, Atsushi Kubo2, Fumiyuki Nakajima3, Hiroshi Ogawa4, Akio Sohma5, Masahiro Suzumura6 (1.Port and Airport Research Institute, 2.Tokyo University of Marine Science, 3.University of Tokyo, 4.Atmosphere and Ocean Research Institute, 5.Mizuho Information and Research Institute, 6.National Institute of Advanced Industrial Science and Technology)

Keywords:Blue Carbon, Climate change, Ecosystem model

Estuarine and shallow coastal systems (ESCS) are recognized as not only significant carbon reservoirs but also net emitters of CO2 to the atmosphere, posing the dilemma of how ESCS functions relate to climate change mitigation. However, some studies have shown that ESCS take up atmospheric CO2. Here we reviewed empirical studies and developed a new ecosystem model to investigate the magnitude and determinants of net uptake atmospheric CO2 by ESCS. We found that the capability of ESCS to function as CO2 sinks is enhanced by environmental conditions that are typical of human-dominated systems (e.g., input of high terrestrial nutrients, input of treated wastewater in which labile carbon is highly removed, and presence of hypoxia).