TY - JOUR
T1 - Microplastics on the sea surface of the semi-closed Tokyo Bay
AU - Nakano, Haruka
AU - Arakawa, Hisayuki
AU - Tokai, Tadashi
N1 - Funding Information:
We would like to thank Associate Prof. Uchida of Tokyo University of Marine Science and Technology for assistance with the observations. We thank Prof. Yoshida for careful proofreading of the manuscript. We thank Captain Miyazaki and the crews of the T/V Seiyo-Maru and R/V Hiyodori for supporting the observation campaigns. This study was supported by the Environmental Research and Technology Development Fund ( JPMEERF18S20208 ) of the Environmental Restoration and Conservation Agency of Japan . We thank Edanz Group ( https://en-author-services.edanzgroup.com/ ) for editing a draft of this manuscript.
Funding Information:
This study was supported by the Environmental Research and Technology Development Fund ( JPMEERF18S20208 ) of the Ministry of the Environment , Japan.
Funding Information:
This study was supported by the Environmental Research and Technology Development Fund (JPMEERF18S20208) of the Ministry of the Environment, Japan.We would like to thank Associate Prof. Uchida of Tokyo University of Marine Science and Technology for assistance with the observations. We thank Prof. Yoshida for careful proofreading of the manuscript. We thank Captain Miyazaki and the crews of the T/V Seiyo-Maru and R/V Hiyodori for supporting the observation campaigns. This study was supported by the Environmental Research and Technology Development Fund (JPMEERF18S20208) of the Environmental Restoration and Conservation Agency of Japan. We thank Edanz Group (https://en-author-services.edanzgroup.com/) for editing a draft of this manuscript.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/1
Y1 - 2021/1
N2 - Microplastics (MPs) pollution surveys were conducted in Tokyo Bay using neuston nets (May 2019 and January 2020). Although the pollution level in Tokyo Bay was high (3.98 pcs/m3, May), it was lower than reported in other semi-closed bays because of differences in the Enclosed Index. It was found that polyethylene fragments dominated the retrieved MPs; the mode of MPs size was 800 μm. As MPs abundance in rivers had the same seasonality as found in the inner bay, rivers were considered the main source of MPs. The seawater residence time is shorter than the time required for the density of MPs to become greater than that of seawater; therefore, it was considered that MPs are transported out of the bay instead of sinking. MPs were aggregated into a convergence zone by residual currents (the thermohaline front) in May (January). These findings will improve understanding of MPs pollution in other bays.
AB - Microplastics (MPs) pollution surveys were conducted in Tokyo Bay using neuston nets (May 2019 and January 2020). Although the pollution level in Tokyo Bay was high (3.98 pcs/m3, May), it was lower than reported in other semi-closed bays because of differences in the Enclosed Index. It was found that polyethylene fragments dominated the retrieved MPs; the mode of MPs size was 800 μm. As MPs abundance in rivers had the same seasonality as found in the inner bay, rivers were considered the main source of MPs. The seawater residence time is shorter than the time required for the density of MPs to become greater than that of seawater; therefore, it was considered that MPs are transported out of the bay instead of sinking. MPs were aggregated into a convergence zone by residual currents (the thermohaline front) in May (January). These findings will improve understanding of MPs pollution in other bays.
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U2 - 10.1016/j.marpolbul.2020.111887
DO - 10.1016/j.marpolbul.2020.111887
M3 - Article
C2 - 33307403
AN - SCOPUS:85097636270
VL - 162
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
SN - 0025-326X
M1 - 111887
ER -