渤海近岸水体悬浮颗粒物对后向散射特性的影响研究  

The Influence of Suspended Particles on Backscattering Properties in the Coastal Waters of Bohai Sea

作　　者：姜玲玲[1] 段家辉 王林[2] 陈艳拢[2] 高思雯 郭翔宇 JIANG Ling-ling;DUAN Jia-hui;WANG Lin;CHEN Yan-long;GAO Si-wen;GUO Xiang-yu(College of Environment Science and Engineering,Dalian Maritime University,Dalian 116026,China;National Marine Environmental Monitoring Center,Dalian 116023,China)

机构地区：[1]大连海事大学环境科学与工程学院,辽宁大连116026 [2]国家海洋环境监测中心,辽宁大连116023

出　　处：《光谱学与光谱分析》2021年第1期156-163,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(42076186,41506197);国家重点研发计划项目(2019YFC1407904)资助。

摘　　要：进行海洋水体悬浮颗粒物的空间分布及粒径构成对后向散射特性变化影响,研究对于加深水体散射性质的认识、提高水色遥感反演参数的精度及海洋环境监测等具有重要意义。结合渤海海域2017年6月、9月的现场数据,获得了夏季、秋季各站位总悬浮颗粒物浓度(SPM)、颗粒粒径以及后向散射系数等参数并进行研究。结果表明,后向散射系数bbp在可见光波段随波长的增加而减小;同时,夏季和秋季,大多数站位bbp(550)的变化趋势与SPM的变化趋势基本一致;在进行两者之间的相关性研究时发现,相关系数R^2并不高,仅为0.24。该研究还建立了平均粒径(DA)、中值粒径(D50)与bbp的关系,得出DA与bbp呈线性关系,受季节及水体颗粒构成的影响,夏季,水体颗粒物以小颗粒为主,两者之间的相关性高于秋季,两个季节的R^2分别为0.7和0.3;同时得出当水体以小颗粒为主时,bbp随DA增大而增大,以大颗粒为主的时,bbp随DA增大而减小。D50与bbp的关系则不同,两者之间呈现非常好的幂指数关系,在同一季节里,bbp均随着D50的增大而减小,即水体中颗粒物粒径越小,其后向散射系数越大,夏季和秋季两者之间的相关系数分别为0.66和0.5;并且发现如果不分季节差异,现场水体颗粒物的粒径构成对bbp的影响很难确定。Studying the influence of the spatial and size distribution of suspended particulate matter on its backscattering properties is of great importance for understanding water body scattering properties and improving inversion accuracy,which is greatly helpful for marine environmental monitoring.Based on the field data of Bohai Sea in June and September 2017,the total suspended particulate matter concentration(SPM),particle size,backscattering coefficient as well as other parameters were obtained.The results showed that the backscattering coefficient(bbp(λ))decreased with the increase of wavelength in the visible wave bands.In summer and autumn,the changing trend of bbp(550)was consistent with that of SPM at most stations;however,the correlation coefficient R^2 between them was only 0.24.In addition,the relationship between mean particle size(DA),median particle size(D50)and bbp(λ)was established in the study respectively.DA and bbp(λ)had a linear relationship,and their relationship was better in summer than in autumn by the influence of particle composition,R^2 was 0.7 in summer and was only 0.3 in autumn.At the same time,it is concluded that the bbp(λ)increased with the increase of DA when the water body was dominated by small particles,but while the water body was dominated by large particles,bbp(λ)decreased with the increase of DA.D50 and bbp(λ)showed a different relationship and had a good power exponential relationship,the more small particles in the water,the higher the particle backscattering coefficients value,and the correlation coefficient was 0.66 and 0.5 in summer and autumn,respectively.The influence of particle size distribution on bbp(λ)was difficult to be determined if without considering the seasonal difference.

关 键 词：近岸水体 总悬浮物浓度 颗粒粒径 后向散射特性 

分 类 号：P76[天文地球—海洋科学]