TYPES AND SIZE OF SUSPENDED PARTICLES IN A TYPICAL CROSS SECTION AT THE CHANGJIANG ESTUARY AND INFLUENCE FACTORS
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摘要: 利用环境扫描显微镜对2010年10月执行国家基金委东海公共航次期间获得长江口及其邻近海域典型断面的悬浮颗粒物类型以及粒级组成进行了系统的观察和统计,分析其影响因素。结果表明:长江口典型断面悬浮体颗粒类型包括矿物颗粒、生物颗粒、有机质颗粒及絮团颗粒四种类型,近岸矿物颗粒、有机质团块百分含量高,而从岸向外生物碎屑增加,絮团颗粒则没有明显的差异,矿物颗粒与生物颗粒的含量呈反相关,有机质团块与絮凝颗粒呈正相关;长江口典型断面中悬浮体颗粒粒径小于10 μm的占70%左右,小于20 μm的占90%,悬浮体粒径由近岸向离岸方向逐渐减小。影响该断面悬浮颗粒类型的因素有河流输入、混合作用、生物作用、絮凝作用和再悬浮作用等,影响颗粒粒径大小除了上述影响外,还受到颗粒沉降作用的影响,这些因素与该处的水团发育有着密切的联系。Abstract: During the NSFC cruise in October 2010, several water samples were recovered along a typical section at the Changjiang Estuary and its adjacent area for study of suspended matters. After filtration, the materials remained were examined under Electronic Microscope and by Energy Spectrometer. Grain size analysis was carried out for the samples. In this typical section, there are four types of particles, mineral debris, bioclasts, organic particles and floc-particles. The contents of mineral debris and organic particles are higher inshore and lower offshore, whereas the bio-particles are distributed in an opposite pattern. However, floc-particles have no obvious change from DH1 to DH6. There is a good linear relationship between floc-particles and organic particles, but a negative relationship between mineral debris and bioclasts. In the suspended matters, the particles smaller than 10 microns in size account for 70%, and those smaller than 20 microns account for 90%, while the average particle size is decreasing offshore. It is believed that the types of particles are mainly controlled by the factors of continental input, biological process, flocculation and resuspension, depending upon the movement of water masses.
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