Water Quality and Pollutant Load in the Edo River, Ara River and Tama River.

Nihei, Yasuo; Ehara, Keisuke; Usuda, Miho; Sakai, Ayako; Shigeta, Kyosuke

doi:10.2208/proce1989.54.1226

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Arakawa River, which is the largest river flowing into the bay, accounts for about 30 % of the freshwater discharge (Nihei et al, 2007a). Most rivers flowing into the bay have similar water quality because of similar land use within the drainage basin (Nihei et al, 2007b); accordingly, we can reasonably assume that observed RDOC and BDOC concentrations at the lower Arakawa River station represent concentrations of total river water flowing into Tokyo Bay. Table 2 summarizes the first-order decay constants obtained by fitting the exponential degradation of DOC with time.…”

Section: Lability and Sources Of Freshwater Doc Flowing Into Tokyo Baymentioning

confidence: 98%

Seasonal variations in concentration and lability of dissolved organic carbon in Tokyo Bay

2015

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Abstract. Concentrations of recalcitrant and bioavailable dissolved organic carbon (DOC) and their seasonal variations were investigated at three stations in Tokyo Bay, Japan, and in two freshwater sources flowing into the bay. On average, recalcitrant DOC (RDOC), as a remnant of DOC after 150 days of bottle incubation, accounted for 78% of the total DOC in Shibaura sewage treatment plant (STP) effluent, 67% in the upper Arakawa River water, 66% in the lower Arakawa River water, and 78% in surface bay water. Bioavailable DOC (BDOC) concentrations, defined as DOC minus RDOC, were lower than RDOC at all stations. In freshwater environments, RDOC concentrations were almost constant throughout the year. In the bay, RDOC was higher during spring and summer than in autumn and winter because of freshwater input and biological production. The relative concentration of RDOC in the bay derived from phytoplankton, terrestrial, and open-oceanic waters was estimated to be 8–10, 21–32, and 59–69%, respectively, based on multiple regression analysis of RDOC, salinity, and chl a. In addition, comparison with previous data from 1972 revealed that concentrations of RDOC and BDOC have decreased by 33 and 74% at freshwater sites and 39 and 76% in Tokyo Bay, while the ratio of RDOC to DOC has increased. The change in DOC concentration and composition was probably due to increased amounts of STP effluent entering the system. Tokyo Bay exported mostly RDOC to the open ocean because of the remineralization of BDOC.

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Section: Lability and Sources Of Freshwater Doc Flowing Into Tokyo Baymentioning

confidence: 98%

Seasonal variations in concentration and lability of dissolved organic carbon in Tokyo Bay

2015

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Section: Lability and Sources Of Freshwater Doc Flowing Into Tokyo Baymentioning

confidence: 98%

Seasonal variations in concentration and composition of dissolved organic carbon in Tokyo Bay

Kubo¹,

Yamamoto‐Kawai²,

Kanda³

2014

Preprint

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Abstract. Concentrations of recalcitrant and bioavailable dissolved organic carbon (DOC) and their seasonal variations were investigated at three stations in Tokyo Bay, Japan, and in two freshwater sources flowing into the bay to evaluate the significance of DOC degradation for the carbon budget in coastal waters and carbon export to the open ocean. Recalcitrant DOC (RDOC) was differentiated from bioavailable DOC (BDOC) as a remnant of DOC after 150 days of bottle incubation. On average, RDOC accounted for 78% of the total DOC in Shibaura sewage treatment plant (STP) effluent, 67% in the upper Arakawa River water, 66% in the lower Arakawa River water, and 78% in surface bay water. RDOC concentrations were higher than BDOC at all stations. In freshwater environments, RDOC concentrations were almost constant throughout the year. In the bay, RDOC was higher during spring and summer than during autumn and winter. The relative abundance of RDOC in the bay derived from phytoplankton, terrestrial, and open oceanic waters was estimated to be 9%, 33%, and 58%, respectively, by multiple regression analysis of RDOC, salinity, and chl a. In addition, comparison with previous data from 1972 revealed that concentrations of RDOC and BDOC have decreased by 33% and 74% at freshwater sites and 39% and 76% at Tokyo Bay, while the ratio of RDOC to DOC has increased. The change in DOC concentration and composition was probably due to increased amounts of sewage treatment plant effluent entering the system. Tokyo Bay exported DOC, mostly RDOC, to the open ocean because of remineralization of BDOC.

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Numerical estimation of inflow flux of floating natural macro-debris into Tokyo Bay

Kataoka¹,

Hinata²,

Nihei³

2013

Estuarine, Coastal and Shelf Science

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Water Quality and Pollutant Load in the Edo River, Ara River and Tama River.

Cited by 3 publications

References 1 publication

Seasonal variations in concentration and lability of dissolved organic carbon in Tokyo Bay

Seasonal variations in concentration and lability of dissolved organic carbon in Tokyo Bay

Seasonal variations in concentration and composition of dissolved organic carbon in Tokyo Bay

Numerical estimation of inflow flux of floating natural macro-debris into Tokyo Bay

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