The effects of estuarine processes on the fluxes of inorganic and organic carbon in the Yellow River estuary |
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| Authors: | Dianjun Gu Longjun Zhang Liqing Jiang |
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| Institution: | 1. College of Environmnetal Science and Engineering, Ocean University of China, Qingdao 266100, P. R. China
2. National Oceanographic and Atmospheric Administration, Climate Program Office, Maryland 20910, USA |
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| Abstract: | Riverine carbon flux is an important component of the global carbon cycle. The spatial and temporal variations of organic
and inorganic carbon were examined during both dry and wet seasons in the Yellow River estuary. Concentrations of dissolved
organic carbon (DOC) and dissolved inorganic carbon (DIC) in the Yellow River during dry seasons were higher than those during
wet seasons. The effective concentrations of DOC (CDOC*) were higher than the observed DOC at zero salinity. This input of DOC in the Yellow River estuary was due to sediment desorption
processes in low salinity regions. In contrast to DOC, the effective concentrations of DIC were 10% lower than the DIC measured
at freshwater end, and the loss of DIC was caused by CaCO3 precipitation in low salinity region. Particulate organic carbon (POC) and particulate inorganic carbon (PIC) contents of
the particles stabilized to constant values (0.5%±0.05% and 1.8%±0.2%, respectively) within the turbidity maximum zone (TMZ)
and showed no noticeable seasonal variations. A rapid drop of PIC and rise of POC occurred simultaneously outside the TMZ
due to an intense dilution of riverine inorganic-rich particles being transported into a pool of aquatic organic-poor particles
outside the TMZ. Annually, the Yellow River transported 6.95×105 t of DIC, 0.64×105 t of DOC, 78.58×105 t of PIC and 2.29×105 t of POC to the sea. |
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| Keywords: | particulate organic carbon particulate inorganic carbon dissolved organic carbon dissolved inorganic carbon Yellow |
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