Coccolith downward fluxes and species compositions recorded in the sediment trap in the northwest South China Sea

Ran Lihua; Luc Beaufort; Li Hongliang; Chen Jianfang; Martin Wiesner; Yang Zhi; Zhang Jingjing; Sun Jun

doi:10.3969/j.issn.0253-4193.2015.12.002

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Ran Lihua, Luc Beaufort, Li Hongliang, Chen Jianfang, Martin Wiesner, Yang Zhi, Zhang Jingjing, Sun Jun. Coccolith downward fluxes and species compositions recorded in the sediment trap in the northwest South China Sea[J]. Haiyang Xuebao, 2015, 37(12): 11-18. doi: 10.3969/j.issn.0253-4193.2015.12.002

Citation:

Ran Lihua, Luc Beaufort, Li Hongliang, Chen Jianfang, Martin Wiesner, Yang Zhi, Zhang Jingjing, Sun Jun. Coccolith downward fluxes and species compositions recorded in the sediment trap in the northwest South China Sea[J]. Haiyang Xuebao, 2015, 37(12): 11-18. doi: 10.3969/j.issn.0253-4193.2015.12.002

Citation:

Ran Lihua, Luc Beaufort, Li Hongliang, Chen Jianfang, Martin Wiesner, Yang Zhi, Zhang Jingjing, Sun Jun. Coccolith downward fluxes and species compositions recorded in the sediment trap in the northwest South China Sea[J]. Haiyang Xuebao, 2015, 37(12): 11-18. doi: 10.3969/j.issn.0253-4193.2015.12.002

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Coccolith downward fluxes and species compositions recorded in the sediment trap in the northwest South China Sea

doi: 10.3969/j.issn.0253-4193.2015.12.002

1.
Lab of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
2.
CEREGE, CNRS/Aix Marseille University, BP80, Aix-en-Provence 13545, France
3.
Lab of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamic, Hangzhou 310012, China
4.
Institute of Geology, University of Hamburg, Hamburg D-20146, Germany
5.
College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China

Received Date: 2015-09-20
Rev Recd Date: 2015-11-10

Abstract

Abstract

Variability of coccolith downward fluxes and species compositions in sinking particles in the northwestern South China Sea was studied using continuous time-series sediment trap mooring during 2012-2013. Highest coccolith fluxes were found in summer. It was related to the southeast Monsoon induced upwelling off Hainan. Relatively high fluxes were also found in winter,probably correlated to the increased mixed layer depth induced by winter cooling and the northeast Monsoon. Florisphaera profunda was the dominant coccolith species in the sediment traps. Emiliania huxleyi,Gephyrocapsa oceanica and Gephyrocapsa ericsonii were also abundant in the sediment traps. Coccoliths were transferred to coccolithopores,and then Emiliania huxleyi instead of Florisphaera profunda turned to be the prdominant coccolithophore species in the sediment traps. A negative correlation was shown between the relative abundances of Florisphaera profunda and the coccolith fluxes. The close relationship of Florisphaera profunda and the coccolithophore productivity observed by the time-series sediment trap mooring served as a basis to use the relative abundance of Florisphaera profunda as a palaeo-productivity proxy in the palaeoceanography studies in the South China Sea.
- coccolith,
- upwelling off Hainan,
- sediment trap,
- Florisphaera profunda

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