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The distribution and concentration of particulate biogenic silica in surface waters of Prydz Bay, Antarctica, during the austral summer of 2011

【标题】The distribution and concentration of particulate biogenic silica in surface waters of Prydz Bay, Antarctica, during the austral summer of 2011

【Title】The distribution and concentration of particulate biogenic silica in surface waters of Prydz Bay, Antarctica, during the austral summer of 2011

【作者】 张海生; 扈传昱; 沈忱; 张海生

【Author】 Zhang Haisheng ; Hu Chuanyu ; Shen Chen ; Zhang Haisheng

【期刊】极地研究

【Journal】Advances in Polar Science

【期刊年份】2012

【卷】23

【期】4

【关键词】 biogenic silica; particle; phytoplankton; particulate organic carbon; Prydz Bay

【Keywords】 biogenic silica; particle; phytoplankton; particulate organic carbon; Prydz Bay

【摘要】 The concentrations and distributions of particulate biogenic silica (PBSi) in the upper surface waters of Prydz Bay, Antarctica, were investigated during the 27th Chinese National Antarctic Research Expedition cruises of January 2011. We aimed to characterize the correlations between PBSi and plankton, nutrients and particulate organic carbon. The results showed that the concentrations of biogenic silica ranged from 0.76—19.72 μmol?dm-3 and the average concentration of biogenic silica was 6.06 μmol?dm-3. The distribution of surface PBSi had significant regional characteristics: The concentrations were higher south of 67°S than to the north. The distribution of PBSi, chlorophyll a and particulate organic carbon showed similar patterns, and PBSi distribution had a negative correlation with that of silicate. In the vertical direction, the mole ratio of PBSi and POC (Sibio/Corg) decreased with increasing depth. This trend indicated a higher rate of PBSi dissolution, or a lower rate of organic matter remineralization rate, in the upper 200 m.

【Abstract】The concentrations and distributions of particulate biogenic silica (PBSi) in the upper surface waters of Prydz Bay, Antarctica, were investigated during the 27th Chinese National Antarctic Research Expedition cruises of January 2011. We aimed to characterize the correlations between PBSi and plankton, nutrients and particulate organic carbon. The results showed that the concentrations of biogenic silica ranged from 0.76—19.72 μmol?dm-3 and the average concentration of biogenic silica was 6.06 μmol?dm-3. The distribution of surface PBSi had significant regional characteristics: The concentrations were higher south of 67°S than to the north. The distribution of PBSi, chlorophyll a and particulate organic carbon showed similar patterns, and PBSi distribution had a negative correlation with that of silicate. In the vertical direction, the mole ratio of PBSi and POC (Sibio/Corg) decreased with increasing depth. This trend indicated a higher rate of PBSi dissolution, or a lower rate of organic matter remineralization rate, in the upper 200 m.

【基金/项目】 南大洋普里兹湾生物硅的生产、溶解、沉降及其保存机制研究 ; 南极普里兹湾微量元素沉积地层记录及其来源、通量和浮游植物群落的生态响应 ; CHINARE 2012-01-04 ; CHINARE 2012-04-04

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