FORAMINIFERAL DISTRIBUTION IN SURFACE SEDIMENTS OF THE NORTHWESTERN TAIWAN STRAIT AND ITS RESPONSE TO THE COASTAL UPWELLING CURRENT
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摘要: 对台湾海峡西北部福建平潭岛附近海域337个表层沉积物样品中的有孔虫进行分析鉴定,研究结果表明浮游有孔虫优势种Globigerinoides sacculifer、G.ruber、Globigerina bulloides的分布及底栖有孔虫组合受到不同水团的影响。根据浮游有孔虫上升流指示种G.bulloides、底栖有孔虫组合和高营养盐深水种的分布特征,对研究区受夏季沿岸上升流的影响范围和程度进行评估。研究区沿岸上升流主要分布于东南部水深大于40 m的海域及平潭岛东部水深20 m附近,最远可达水深低于10 m的海湾内部分区域,但强度相对减弱,水深较浅的陆地和岛屿边缘附近未受沿岸上升流影响。平潭岛东北部到南日岛西南部水深10~30 m部分区域由于受到冬季浙闽沿岸流的影响,沿岸上升流在该区域的沉积记录缺失。Abstract: The foraminiferal distribution in 337 samples of surface sediments collected from the northwestern of Taiwan Strait near the Pingtan Island of Fujian province has been quantitatively analyzed. The study results show that the distribution of the dominant planktonic foraminifera (PF) species of Globigerinoides sacculifer、G. ruber、Globigerina bulloides and the benthic foraminiferal(BF) assemblages are controlled by different water currents. Based on the abundance of the coastal upwelling species G. bulloides, BF nutrient-rich infaunal species and BF assemblages, the distribution and the strength of the coastal upwelling current are evaluated. The most intensive summer coastal upwelling current is located in the southeastern area with a water depth over 40 m, and the eastern area off the Pingtan Island with a water depth more than 20 m. Some areas less than 10 m deep in the central bay are also weakly influenced by it. The shallow water areas close to the continent and island are not influenced by the coastal upwelling current. Due to the influence of the Zhemin alongshore current, the coastal upwelling current is not recorded in some areas between the water depth of 10m and 30 m from the northeastern Pingtan Island to the southwestern Nanri Island.
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Key words:
- the Taiwan Strait /
- coastal upwelling current /
- foraminifera /
- surface sediment
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