Seasonal variations of dissolved organic matter and nutrients in sediment pore water in the inner part of Tokyo Bay
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- 作者：Saori Yasui ; Jota Kanda ; Toshihiro Usui ; Hiroshi Ogawa
- 关键词：Dissolved organic matter ; Nutrient ; Pore water ; Seasonal variation ; Tokyo Bay
- 刊名：Journal of Oceanography
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：72
- 期：6
- 页码：851-866
- 全文大小：892 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Oceanography
Hydrobiology - 出版者：Springer Netherlands
- ISSN：1573-868X
- 卷排序：72
文摘
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 μM, from 14.6 to 75.9 μM, and from 0.02 to 9.83 μM, 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.