颗粒物质和微量金属在东海北部的沉积通量

THE SEDIMENT FLUXES OF PARTICULATE MATTER AND TRACE METALS IN NORTHERN EAST CHINA SEA

于1990年运用沉积物捕捉器采样,实测了东海北部(32.00°N,126.00°E)海域颗粒物质和微量金属(Cu,Pb,Zn,Cr,Fe,Mn和Al)的海洋垂直通量。结果表明,颗粒物质的沉积通量随深度和季节而变化,明显地受上升流的影响。沉积的颗粒物质以0.45—63μm的小颗粒为主;Cu和Zn主要以有机物形式作垂直转移,Pb,Cr,Fe和Mn主要以弱键结合形式作垂直转移,Al则以硅酸盐的形式作垂直转移。沉积物中,颗粒Cu,Fe,Mn和Al以0.45—63μm的颗粒为主;颗粒Pb和Cr以大于63μm的颗粒为主;0.45—63μm和大于63μm的颗粒Zn在沉积物中占相近的比例。

Vertical oceanic fluxes of parliculate matter and trace matals (Cu, Pb, Zn, Cr, Fe, Mn and Al) were measured with sediment trap in the North East China Sea (32.00°N, 126.00°E) 4-6, May and 27-29, July, 1990. The average daily fluxes of particulate matter and Cu, Pb, Zn, Fe, Cr, Mn and Al were 0.89 g/(m2·d), 0.11 mg/(m2·d), 0.41 mg/(m2·d), 0.58 mg/ (m2·d), 19.75mg/(m2·d), 0.33mg/(m2·d), 0.34mg/(m2·d), and 34.34mg/(m2·d), respectively. The results showed that the vretical flux changed with depth and seasons, and were obviously influenced by upwelling. The size range of sinking particulate matter was mainly between 0.45 and 63 μm. Vertical transfer of paniculate Cu and Zn depended on the organic form, Cr, Fe, PI) and Mn on weak-bond form and Al on silicate form. The size of particulate Cu, Fe, Mn and Al were mainly between 0.45 and 63μm. Most of sinking particulate Cr and Pb were larger than 63 μm and the proportion of 0.45-63 μm and more than 63μm particulate Zn in sediment matter were similar.