Journal
JOURNAL OF OCEANOGRAPHY
Volume 72, Issue 6, Pages 851-866Publisher
SPRINGER
DOI: 10.1007/s10872-016-0382-0
Keywords
Dissolved organic matter; Nutrient; Pore water; Seasonal variation; Tokyo Bay
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [24510009]
- Sumitomo Foundation [113214]
- Grants-in-Aid for Scientific Research [24510009, 16K12579] Funding Source: KAKEN
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At four stations in Tokyo Bay, pore water profiles of dissolved organic carbon (DOC), nitrogen (DON), phosphorus (DOP), and inorganic nutrients were determined at 3-month intervals over 6 years. Concentrations of dissolved organic matter (DOM) and nutrients were significantly higher in pore waters than in the overlying waters. Pore water DOC, DON, and DOP concentrations in the upper most sediment layer (0-1 cm) ranged from 246 to 888 mu M, from 14.6 to 75.9 mu M, and from 0.02 to 9.83 mu M, respectively. Concentrations of DOM and nutrients in pore waters occasionally showed clear seasonal trends and were highest in the summer and lowest in the winter. The seasonal trends in the pore water DOM concentrations were coupled with trends in the overlying water temperature and dissolved oxygen concentration. Benthic effluxes of DON and DOP were low compared with those of inorganic nutrients, accounting for only 1.0 and 1.5 % of the total benthic effluxes of nitrogen and phosphorus, respectively; thus benthic DOM fluxes were quantitatively insignificant to the inorganic nutrient fluxes in Tokyo Bay. The DOM fluxes represented about 7, 3, and 10 % of the riverine discharge of DOC, DON, and DOP to Tokyo Bay, respectively.
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