Coastal urbanization alters carbon cycling in Tokyo Bay

Abstract The carbon budget of Tokyo Bay, a highly urbanized coastal basin, was estimated using a box model that incorporated inorganic and organic carbon data over an annual cycle (2011–2012). The surface water represented net autotrophic system in which the annual net community production (NCP) was...

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Autores principales:	Atsushi Kubo, Jota Kanda
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1610e30cb7524c489eef2ef7e51f6575
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spelling	oai:doaj.org-article:1610e30cb7524c489eef2ef7e51f65752021-12-02T15:10:19ZCoastal urbanization alters carbon cycling in Tokyo Bay10.1038/s41598-020-77385-42045-2322https://doaj.org/article/1610e30cb7524c489eef2ef7e51f65752020-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-77385-4https://doaj.org/toc/2045-2322Abstract The carbon budget of Tokyo Bay, a highly urbanized coastal basin, was estimated using a box model that incorporated inorganic and organic carbon data over an annual cycle (2011–2012). The surface water represented net autotrophic system in which the annual net community production (NCP) was 19 × 1010 gC year−1. The annual loading of dissolved inorganic carbon and total organic carbon (TOC) from freshwater inputs was 11.2 × 1010 and 4.9 × 1010 gC year−1, respectively. The annual TOC sedimentation rate was 3.1 × 1010 gC year−1, similar to the annual air–sea CO2 uptake (5.0 × 1010 gC year−1). Although the NCP and TOC loading from freshwater inputs were respectively 3.0 and 2.7 times lower than those in the 1970s, the TOC sedimentation rate was similar. Therefore, a relatively high carbon efflux from Tokyo Bay likely occurred in the 1970s, including CO2 efflux to the atmosphere and/or export of labile organic carbon to the open ocean. The changes in carbon flow between the 1970s and 2011–2012 resulted from improved water quality due to increased sewage treatment facilities and improved sewage treatment efficiency in the catchment, which decreased the amount of labile organic carbon flowing into the bay.Atsushi KuboJota KandaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-11 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Atsushi Kubo Jota Kanda Coastal urbanization alters carbon cycling in Tokyo Bay
description	Abstract The carbon budget of Tokyo Bay, a highly urbanized coastal basin, was estimated using a box model that incorporated inorganic and organic carbon data over an annual cycle (2011–2012). The surface water represented net autotrophic system in which the annual net community production (NCP) was 19 × 1010 gC year−1. The annual loading of dissolved inorganic carbon and total organic carbon (TOC) from freshwater inputs was 11.2 × 1010 and 4.9 × 1010 gC year−1, respectively. The annual TOC sedimentation rate was 3.1 × 1010 gC year−1, similar to the annual air–sea CO2 uptake (5.0 × 1010 gC year−1). Although the NCP and TOC loading from freshwater inputs were respectively 3.0 and 2.7 times lower than those in the 1970s, the TOC sedimentation rate was similar. Therefore, a relatively high carbon efflux from Tokyo Bay likely occurred in the 1970s, including CO2 efflux to the atmosphere and/or export of labile organic carbon to the open ocean. The changes in carbon flow between the 1970s and 2011–2012 resulted from improved water quality due to increased sewage treatment facilities and improved sewage treatment efficiency in the catchment, which decreased the amount of labile organic carbon flowing into the bay.
format	article
author	Atsushi Kubo Jota Kanda
author_facet	Atsushi Kubo Jota Kanda
author_sort	Atsushi Kubo
title	Coastal urbanization alters carbon cycling in Tokyo Bay
title_short	Coastal urbanization alters carbon cycling in Tokyo Bay
title_full	Coastal urbanization alters carbon cycling in Tokyo Bay
title_fullStr	Coastal urbanization alters carbon cycling in Tokyo Bay
title_full_unstemmed	Coastal urbanization alters carbon cycling in Tokyo Bay
title_sort	coastal urbanization alters carbon cycling in tokyo bay
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/1610e30cb7524c489eef2ef7e51f6575
work_keys_str_mv	AT atsushikubo coastalurbanizationalterscarboncyclingintokyobay AT jotakanda coastalurbanizationalterscarboncyclingintokyobay
_version_	1718387674906099712

Coastal urbanization alters carbon cycling in Tokyo Bay

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