Measurements of suspended particulate matter with laser in-situ scattering and transmissometry in the Jiaozhou Bay in China

作     者：WEI Jianwei SHI Xuefa FANG Xisheng ZHANG Weibin 

作者机构：First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Sedimentology and Envrionmental Geology of State Oceanic Administration First Institute of Oceanography State Oceanic Administration Qingdao 266061 China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2007年第26卷第1期

页      面：55-65页

核心收录：

学科分类：082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 0804[工学-仪器科学与技术] 

基　　金：国家海洋局海洋沉积与环境地质重点实验室基金 国家海洋局第一海洋研究所项目 山东省青岛市科技发展计划项目 

主　　题：suspended particle size distribution beam attenuation LISST - 100 Jiaozhou Bay 

摘      要：A laser in-situ scattering and transmissemetry probe （LISST - 100） was used to estimate the spatial variations of suspended particle （aggregate） distribution, volume concentration and beam attenuation in the Jiaozhou Bay, Qingdao, China on 18 July 2003. One study site was located at the mouth （Sta. J1 ）, with the other being within the inner bay （Sta. J2）. Measurements of total suspended matter （TSM） and chlorophyll fluorescence and sampling of bottom sediments were carried out simultaneously. On the basis of the field data, the in-situ particle effective density, settling velocity and flux, and particle projected surface area （PSA） were estimated. The results demonstrate that both profiles have similar particle size distributions from surface to bottom within the water columns. Mean particle diameters for Stas J1 and J2 are 38 - 74 and 1 - 20 μm, respectively, particles within these ranges dominate over the particulate components. Suspended particle volume concentrations increase with water depth, with spikes near the bottom. At Sta. J1, the mean size of bottom sediments and those of suspended particles at 10.8 m below the water surface are almost the same, as well as their size distributions. This observation suggests that a special affinity exists between bottom sediment and suspended particles. In addition, the estimates show that the effective density, settling velocity and flux are higher in the innet bay. Beam attenuation coefficient correlates well with the volume concentration, positively. It is inferred that the optical scattering was mostly caused by 1 - 250 μm components, among which the particles finer than 20 μm dominate the beam attenuation. The PSA appears a proxy for the leaving reflectance estimation.