胶州湾悬浮颗粒现场剖面测量与结果分析  

In-situ Profiling of Suspended Particulate Matters in the Jiaozhou Bay and Analysis of Observed Data

作　　者：魏建伟[1] 石学法[1] 方习生[1] 张伟滨[1] 王宗灵[1] 

机构地区：[1]国家海洋局第一海洋研究所

出　　处：《海洋科学进展》2006年第1期74-82,共9页Advances in Marine Science

基　　金：青岛市科技发展计划课题--胶州湾悬浮体动力学及其环境响应研究(05-01-hy-83);国家重点基础研究发展规划项目前期研究--我国近海浮游植物多样性演变机理及其对生态系统功能的影响(2002CCA04900)

摘　　要：应用LISST-100现场激光粒度仪于2003年3月在胶州湾首次进行了悬浮颗粒剖面测量，获得了2个剖面的悬浮颗粒现场粒度分布光衰减资料。2个剖面的悬浮颗粒分布自上而下非常相似，颗粒平均大小多为38～74μm,其中1～20μm细颗粒组分所占的比重高。水柱表层悬浮颗粒略粗于底部悬浮颗粒，而且内湾悬浮颗粒比外湾粗。水柱近底层悬浮颗粒粒径同底质浮泥颗粒粒径大小相近，颗粒组成也非常相似。悬浮颗粒浓度自上而下逐渐增大，接近底部颗粒浓度急剧增高。根据现场测量数据可以马上对悬浮颗粒有效密度、颗粒沉降速率和通量做粗略估算。分析结果表明，光衰减系数同颗粒浓度显著相关，推断光衰减主要是由1～250μm悬浮颗粒的散射作用引起的，而〈20μm的悬浮粒子对光衰减作用起着主要控制作用。光衰减系数与颗粒投影面积显著相关，表明颗粒投影面积可以作为遥感离水反射率的替代指标．A laser in-situ scattering and transimssometry-100（LISST-100） instrument was used to make a prifiling of suspended particulate matter （SPM） in the Jiaozhou Bay in March 2003, and two profiles of SPM were obtained. The SPM distributions on two profiles are similar to each other, the mean particls sizes were in the range of 38 μm to 74 μm, and the fine-grained components of grain size 1 to 20 μm made up high percentage. The suspended particles were slightly coarser in the surface layer than in the bottom layer, and the suspended particles were coarser in the inner bay than in the outer bay. The suspended particle sizes in the near-bottom layer were close to the bottom mud particle sizes, and their grain compositions are also similar to each other. The volume concentration of suspended particles increased with increasing depth and the volume concentration drastically increased in approaching to the bottom. The suspended particle effective density, settling velocity and settling flux can be calculated by using the profiling data, and it is shown from the calculated results that the light attenuation coefficient is significantly correlated with the volume concentration of suspended particles, the light attenuation is caused mainly by the scattering of suspended particles of grain size 1 to 250 μm , and is controlled mainly by the suspended particles of grain size 1 to 20 μm. The light attenuation coefficient is also significantly correlated with the particle projected surface area （PSA）, so the particle PSA can be used as a proxy for remotely sensed water leaving reflectance.

关 键 词：胶州湾 悬浮体 粒径分布 光衰减 现场激光粒度仪 

分 类 号：P736.2[天文地球—海洋地质]