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- Title
Seasonal variations in the abundance and sinking flux of biogenic silica in Daya Bay, northern South China Sea.
- Authors
Xiufeng Zhao; Weifeng Yang; Haoyang Ma; Junjie Li; Min Chen; Ziming Fang; Xiao Zhang; Jian Zeng; Yusheng Qiu; Minfang Zheng
- Abstract
Coastal seas account for >50% of the biogenic silica (BSi) production in marine environments. However, BSi sinking is poorly understood. Here, seasonal variations in the abundance and sinking flux of BSi were investigated in Daya Bay, in the northern South China Sea. The highest BSi concentrations occurred in summer, averaging 8.04 ± 5.48 mmol L-1 (±SD), followed by autumn (5.51 ± 3.11 mmol L-1) and spring (3.76 ± 3.06 mmol L-1). The lowest BSi concentration of 2.93 ± 1.34 mmol L-1 was observed in winter. Based on 234Th/238U disequilibria, the average BSi sinking fluxes were 7.08 ± 8.62, 10.01 ± 13.95, and 8.30 ± 13.06 mmol Si m-2 d-1 in spring, summer, and autumn, respectively. The lowest flux of 4.19 ± 3.98 mmol Si m-2 d-1 was measured in winter. Together with nitrogen fluxes, the Si:N sinking ratios were 0.8:1.0, 1.5:1.0, 1.6:1.0, and 1.4:1.0 in spring, summer, autumn, and winter, respectively, indicating that particle sinking induces the faster removal of Si compared to N in Daya Bay.
- Subjects
SEASONAL variations in the ocean; FLUX (Energy); SILICA; BAYS; SEAS
- Publication
Oceanologia, 2019, Vol 61, Issue 2, p239
- ISSN
0078-3234
- Publication type
Article
- DOI
10.1016/j.oceano.2018.11.003