基于LISST-100X观测黄东海悬浮颗粒物时空变化特征分析

发布时间：2018-01-14 05:01

本文关键词：基于LISST-100X观测黄东海悬浮颗粒物时空变化特征分析　出处：《天津科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：陆架海中悬浮颗粒物的浓度及粒径信息是极其重要的环境参数,广泛用在颗粒物沉降速率和通量的计算研究中。通过现场观测认识黄东海悬浮颗粒物浓度及粒径分布规律,.有助于提高近岸环境遥感反演的准确度,也有助于理解悬浮颗粒物沉积动力学特性。本文基于现场观测的悬浮颗粒物、水文及叶绿素等数据资料,分析黄东海悬浮颗粒物时空分布特征。首先给出不同季节黄东海悬浮颗粒物总浓度、不同粒径颗粒物浓度的水平(表、底层)和垂直(断面、周日)分布的基本特征,其次是划分4个子区域,即黄海西岸、黄海中部、苏北浅滩外及长江浅滩和东海中陆架,对悬浮颗粒物浓度进行统计,同时计算出颗粒物浓度垂直剖面周日变化范围(日均值和95%置信区间),最后初步探讨了影响悬浮颗粒物水平和垂直分布的环境因子。调查海域四季颗粒物浓度均为底层高于表层;表层颗粒物浓度春季最高、夏季低,长江浅滩四季维持颗粒物高浓度,并且在不同季节高浓度分布范围不同。底层颗粒物浓度四季分布趋势相似,浓度高值均位于长江浅滩,浅滩的强潮能环境易形成颗粒物再悬浮。表层春、夏季大粒径颗粒组分占优,受浮游生物影响大,特别是中型浮游动物,而秋、冬季小粒径颗粒组分占优,长江浅滩以小无机颗粒为主。底层四季均为小颗粒占优,易受到再悬浮影响,以无机颗粒为主。次表层主要受大粒径颗粒组分(如中型浮游动物)影响呈现浓度高值,不同季节浓度高值位于不同深度,并且与层结深度基本一致。次表层层结强度变化对底层高浓度向上扩散有影响作用。春季混合均匀水体中,上层悬浮颗粒物浓度周日变化受到浮游植物水华影响呈现颗粒物浓度高值,下层受到水体混合强、大潮影响使颗粒物再悬浮显著呈浓度高值。夏季层结水体中,次表层呈现双跃层现象,上跃层以上夜间受浮游植物高生物量影响形成颗粒物浓度高值,中层大颗粒中型浮游动物处在双跃层附近形成浓度高值,并且发现存在浮游动物垂直移动现象。
[Abstract]:The concentration and particle size of suspended particles in shelf sea are very important environmental parameters. It is widely used in the calculation of settling rate and flux of particulate matter. It is helpful to improve the accuracy of remote sensing inversion of near-shore environment through field observation to understand the distribution law of suspended particle concentration and particle size in the Yellow and East China Sea. It is also helpful to understand the sedimentary dynamics of suspended particulates. This paper is based on the data of suspended particulates hydrology and chlorophyll observed in the field. The temporal and spatial distribution characteristics of suspended particles in the East China Sea and Yellow Sea were analyzed. Firstly, the level (table, bottom layer) and vertical (section) of suspended particulate matter concentration in different seasons and different particle sizes in the East China Sea were given. The basic characteristics of Sunday's distribution, followed by the division of four sub-regions, namely, Huang Hai West Bank, the middle of Huang Hai, the northern Jiangsu shoal, the Yangtze River shoal and the middle shelf of the East China Sea, were used to calculate the concentration of suspended particulates. At the same time, the diurnal variation range (daily mean and 95% confidence interval) of particle concentration vertical profile was calculated. Finally, the environmental factors affecting the horizontal and vertical distribution of suspended particulates were preliminarily discussed. The concentration of surface particles is the highest in spring and low in summer. The high concentration of particles is maintained in the Yangtze shoal in four seasons, and the distribution range of high concentration is different in different seasons. The distribution trend of bottom particulate concentration in four seasons is similar. The high concentration values are located in the Yangtze River shoal, the strong tidal energy environment of the shoal is easy to form particulate matter re-suspension. The large particle size in surface spring and summer is dominant, and it is greatly affected by plankton, especially the medium-sized zooplankton, but autumn. In winter, the small particle size is dominant, the Yangtze River shoal is dominated by small inorganic particles, and the bottom layer is dominated by small particles in the four seasons, which is easy to be affected by resuspension. The subsurface layer was mainly affected by the large particle size fraction (such as the medium zooplankton) and the concentration was high in different seasons. And it is consistent with the stratification depth basically. The change of the subsurface layer strength has an effect on the bottom layer high concentration diffusion. The concentration of suspended particles in the upper layer was affected by phytoplankton Shui Hua, and the concentration of particulate matter in the lower layer was high, and the influence of the spring tide caused the concentration of particles to be significantly higher. In summer, the concentration of particulate matter in stratified water was very high. The phenomenon of double cline appeared in the subsurface layer, the high concentration of particulate matter was formed above the upper cline layer under the influence of high biomass of phytoplankton at night, and the high concentration value of middle-sized pellet zooplankton was formed near the double cline layer. The vertical movement of zooplankton was also found.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P734.23

【相似文献】