295
© Springer Nature Singapore Pte Ltd. 2019
T. Kuwae, M. Hori (eds.), Blue Carbon in Shallow Coastal Ecosystems,
https://doi.org/10.1007/978-981-13-1295-3_11
Chapter 11
CO 2 Uptake in the Shallow Coastal
Ecosystems Affected by Anthropogenic
Impacts
Tomohiro Kuwae, Jota Kanda, Atsushi Kubo, Fumiyuki Nakajima,
Hiroshi Ogawa, Akio Sohma, and Masahiro Suzumura
Abstract Shallow coastal ecosystems (SCEs) are generally recognized as not only
significant organic carbon reservoirs but also as sources for CO 2 emission to the
atmosphere, thus posing a dilemma regarding their role in climate change mitigation measures. However, we argue that SCEs can act as sinks for atmospheric CO 2
under a given set of biogeochemical and socioeconomic conditions. The key properties of SCEs that show net uptake of atmospheric CO 2 are often characteristic of
human-dominated systems, that is, high nutrient inputs from terrestrial systems,
input of treated wastewater in which labile carbon has been mostly removed, and the
presence of hypoxic waters. We propose a new perspective on the potential of
human-dominated SCEs to contribute to climate change mitigation, both serving as
T. Kuwae (*)
Coastal and Estuarine Environment Research Group, Port and Airport Research Institute,
Yokosuka, Japan
e-mail: kuwae@p.mpat.go.jp
J. Kanda
Department of Ocean Sciences, Tokyo University of Marine Science and Technology,
Minato-ku, Tokyo, Japan
A. Kubo
Department of Geoscience, Shizuoka University,
Suruga-ku, Shizuoka-Shi, Shizuoka-Ken, Japan
F. Nakajima
Department of Urban Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
H. Ogawa
Atmosphere and Ocean Research Institute, The University of Tokyo,
Kashiwanoha, Kashiwa-shi, Chiba, Japan
A. Sohma
Graduate School of Engineering, Osaka City University,
Sugimoto, Sumiyoshi-ku, Osaka, Japan
M. Suzumura
National Institute of Advanced Industrial Science and Technology, AIST Tsukuba West,
Tsukuba, Japan
© Springer Nature Singapore Pte Ltd. 2019
T. Kuwae, M. Hori (eds.), Blue Carbon in Shallow Coastal Ecosystems,
https://doi.org/10.1007/978-981-13-1295-3_11
Chapter 11
CO 2 Uptake in the Shallow Coastal
Ecosystems Affected by Anthropogenic
Impacts
Tomohiro Kuwae, Jota Kanda, Atsushi Kubo, Fumiyuki Nakajima,
Hiroshi Ogawa, Akio Sohma, and Masahiro Suzumura
Abstract Shallow coastal ecosystems (SCEs) are generally recognized as not only
significant organic carbon reservoirs but also as sources for CO 2 emission to the
atmosphere, thus posing a dilemma regarding their role in climate change mitigation measures. However, we argue that SCEs can act as sinks for atmospheric CO 2
under a given set of biogeochemical and socioeconomic conditions. The key properties of SCEs that show net uptake of atmospheric CO 2 are often characteristic of
human-dominated systems, that is, high nutrient inputs from terrestrial systems,
input of treated wastewater in which labile carbon has been mostly removed, and the
presence of hypoxic waters. We propose a new perspective on the potential of
human-dominated SCEs to contribute to climate change mitigation, both serving as
T. Kuwae (*)
Coastal and Estuarine Environment Research Group, Port and Airport Research Institute,
Yokosuka, Japan
e-mail: kuwae@p.mpat.go.jp
J. Kanda
Department of Ocean Sciences, Tokyo University of Marine Science and Technology,
Minato-ku, Tokyo, Japan
A. Kubo
Department of Geoscience, Shizuoka University,
Suruga-ku, Shizuoka-Shi, Shizuoka-Ken, Japan
F. Nakajima
Department of Urban Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
H. Ogawa
Atmosphere and Ocean Research Institute, The University of Tokyo,
Kashiwanoha, Kashiwa-shi, Chiba, Japan
A. Sohma
Graduate School of Engineering, Osaka City University,
Sugimoto, Sumiyoshi-ku, Osaka, Japan
M. Suzumura
National Institute of Advanced Industrial Science and Technology, AIST Tsukuba West,
Tsukuba, Japan