三峡大坝启用后长江口及邻近海域秋季悬浮体、叶绿素分布特征及影响因素

基于2010年10月在长江口海域海洋综合调查,利用多参数CTD现场调查数据、悬浮体浓度测定数据,对该区悬浮体和叶绿素的空间分布及影响因素进行系统的研究,探讨三峡工程蓄水7a以来长江口的悬浮体和叶绿素的分布特征及变化.结果表明:浊度值与悬浮体浓度存在良好的线性关系,盐度对该线性关系没有明显的影响;长江口及其邻近海域悬浮体主要分布在123°E以西的海域,表现为近岸高、离岸低,表层低、底层高,其分布主要受到水团、长江输入、上升流等的影响;叶绿素在123°E往东的海域含量较高,近岸低,在123°E～124°E之间叶绿素含量最高,其分布主要受到水团、浮游植物种类和季节变化及营养盐的共同影响.与三峡工程蓄水前对比,悬浮体高值区的界限往西移动了近半个经度,同季节的叶绿素含量的平均值降低.

Distribution and Influencing Factors of Suspended Matters and Chlorophyll in Autumn in Yangtze River Estuary Post-Three Gorges Dam

For studying the change of distribution of total suspended matters and Chlorophyll in Yangtze River Estuary,the samples and data had been obtained from the comprehensive research cruise in Oct 2010,seven years since the first-stage storage of the Three Gorges Dam.The samples acquired by pressure-sensitive water sampler had been filtered using pumped filter,and the concentration of total suspended matters had been worked out.The data of chlorophyll,turbidity,salinity and temperature had been acquired by an in situ CTD system.Distribution patterns of total suspended matters and Chlorophyll,and their influencing factors were systematically studied.The results show that:(1) there is a good linear relationship between turbidity and total suspended matters concentration without relation to different salinity.(2) the high concentration of total suspended matters locates in the area west of 123°E,and most Chlorophyll flocks together in the area between 123°E and 124°E.The water masses and discharges of the Yangtze River are main factors to control their distributions.In contrasting to pre-Three Gorges Dam Project,the extent of total suspended matter has shrunk to coastal by a half of longitude,and the value of Chlorophyll has decreased.