DISTRIBUTION OF BIOGENIC SILICA IN THE UPWELLING ZONES IN THE SOUTH CHINA SEA

被引:0
|
作者
Liu, Yang [1 ]
Dai, Minhan [1 ]
Chen, Weifang [1 ]
Cao, Zhimian [1 ]
机构
[1] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China
关键词
SURFACE SEDIMENTS; OCEAN; NORTHEASTERN; OPAL; SI;
D O I
暂无
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Biogenic silica (BSi) is an important parameter to understand biogeochemical processes and paleoceanographic records in the ocean. Here we examined the distribution of BSi in the water column in two upwelling regions in the South China Sea (SCS), northwest to the Luzon island in winter and off Vietnam in summer. Also examined were the BSi contents in the sediments collected from the western SCS off Vietnam to investigate if BSi between the water column and sediment is coupled. In winter 2006, BSi concentrations in the water column ranged 0.60-1.83 mu mol L-1 in the upwelling zone off Luzon, while the concentration range of 0.01-0.20 mu mol L-1 was much lower in the western SCS off Vietnam in non-upwelling seasons. In summer 2007, however, BSi concentrations varied between 0.05 and 0.11 mu mol L-1 in the areas off Luzon whereas the concentration significantly increased, up to 2.16 mu mol L-1 in the water column off Vietnam. In the western SCS off Vietnam, BSi contents in the sediments displayed a general decreasing trend with increasing water depth, ranging from 2.42 to 4.29 wt.% as SiO2. BSi in the surface sediments of this area was low and no apparent differences of BSi contents were observed in the surface sediments between the upwelling and non-upwelling zones in the SCS, suggesting decoupling of BSi between the sediment and the overlying water column.
引用
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页码:55 / 65
页数:11
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