冲绳海槽中南部及其邻近陆架悬浮体的分布、组成和影响因子分析
The distribution and composition of suspended matters and their influencing factors in the central-southern area of Okinawa Trough and its adjacent shelf sea
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摘要: 初夏冲绳海槽中南部海域悬浮体含量的分布特点为:表层水体中部海区高,南北海区低;中底层水体自南西至北东由低至高.从陆架到海槽断面的悬浮体含量分布为陆架最高值区、陆坡最低值区和海槽低值区.悬浮体组成包括矿物岩石碎屑、生物骨屑以及絮凝体.矿物岩石碎屑主要分布在陆架区中、下层水体,生物骨屑主要分布在海槽区(整个水层)和陆架区上层水体,絮凝体在研究区都有分布.海槽区与陆架区的悬浮体含量垂直分布和组分特征具有明显的差异.研究区悬浮体分布和组成主要受控于黑潮对陆架物质向冲绳海槽输送的阻隔、生物生产量以及地形、地理环境.Abstract: In early summer,concentration of total suspended matter(TSM) in the surface layer water in the middle area of the central-southern Okinawa Trough sea area is a relative higher than that in the north and south.While in the middle and bottom layers water,the concentration of TSM in the northeast of the central-southern Okinawa Trough is higher than that in the southwest.The sectional distribution of TSM from the shelf to the Okinawa Trough can be divided into three provinces,namely,the high TSM zone mainly corresponding to the shelf,the lowest TSM zone mainly corresponding to the continental slope,and the low TSM zone corresponding to the Okinawa Trough.The suspended matter chiefly consists of rock and mineral debris dominating in the middle-bottom layers water in the shelf,skeletal debris dominating in the whole water column in the Okinawa Trough and the upper water layer in the shelf,and aggregation distributing in the whole study area.The main factors controlling the distribution and composition of suspended matter are the obstruction of the Kuroshio Current which prevents the transport of terrigenous debris from shelf to the Okinawa Trough,marine organism production,and topographic and geographic environment.
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