期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 122, 期 12, 页码 9415-9428出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017JC013325
关键词
dissolved organic carbon; northern South China Sea shelf; spatial and seasonal variations; physical controls; biological production; inter-shelf and cross-shelf transport
类别
资金
- National Key Scientific Research Project - Ministry of Science and Technology of the People's Republic of China [2015CB954000, 2015CB954001]
- National Natural Science Foundation of China-Research Grants Council (NSFC-RGC) [41361164001]
- RGC, University Grants Committee (Hong Kong) [T21602/16-R]
We examined the distribution and seasonality of dissolved organic carbon (DOC) based on a large data set collected from the northern South China Sea (NSCS) shelf under complex circulation schemes influenced by river plume, coastal upwelling, and downwelling. The highest surface values of similar to 117 mu mol L-1 were observed nearshore in summer suggesting high DOC supplies from the river inputs, whereas the lowest surface values of similar to 62 mu mol L-1 were on the outer shelf in winter due to entrainment of DOC-poor subsurface water under strengthened vertical mixing. While the summer coastal upwelling brought lower DOC from offshore depth to the nearshore surface, the winter coastal downwelling delivered higher surface DOC to the midshelf deep waters from the inner shelf fueled by the China Coastal Current (CCC) transporting relatively high DOC from the East China Sea to the NSCS. The intensified winter downwelling generated a cross-shelf DOC transport of 3.1 x 10(12) g C over a large shelf area, which induced a significant depression of the NSCS DOC inventory in winter relative to in autumn. In addition to the variable physical controls, net biological production of DOC was semiquantified in both the river plume (2.8 +/- 3.0 mu mol L-1) and coastal upwelling (3.1 +/- 1.3 mu mol L-1) in summer. We demonstrated that the NSCS shelf had various origins of DOC including riverine inputs, inter-shelf transport and in situ production. Via cross-shelf transport, the accumulated DOC would be exported to and stored in the deep ocean, suggesting that continental shelves are a potentially effective carbon sink.
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