基于LISST数据的冬季南黄海悬浮体分布

DISTRIBUTION OF WINTER SUSPENDED PARTICULATE MATTERS IN THE SOUTH YELLOW SEA BASED ON LISST DATA

用现场激光粒度仪LISST观测悬浮体,具有纵向分辨率更大及可以实现分粒级测量悬浮体浓度的优势。基于2007年1月南黄海高分辨率LISST观测数据,结合水样抽滤、CTD温盐等观测数据,将LISST体积浓度转化为质量浓度,分析冬季南黄海悬浮体分布规律。结果表明,南黄海三剖面的LISST体积浓度数据与抽滤质量浓度相关性较好,转化后的LISST数据与抽滤相比更适于分析悬浮体的分布;受海流影响,南黄海海底存在多个高悬浮体区域,沿岸流控制下的悬浮体主要为细颗粒物质,黄海暖流控制下的悬浮体主要为粗颗粒物质;海洋温跃层明显促进了近底层悬浮体的富集。

The distribution of winter suspended particulate matters （SPM） in the South Yellow Sea was studied in this paper based on the LISST data acquired in January 2007. Mass concentration of SPM was measured by membrane filtering, drying and weighting in the laboratory. Water temperature and salinity surveyed by CTD were also taken into account in this study. Volume concentration was converted to mass concentration, considering the closely correlation between the volume concentrations of SPM observed by LISST and the mass concentration collected by suction filtration. Furthermore, volume concentrations were preferred to the description of SPM distribution in the South Yellow Sea, because of its high resolu- tion in the vertical direction. Fine particles can be suspended by coastal currents, while coarse biological particles can be transported by the Yellow Sea Warm Current. SPM can be concentrated below the thermo- cline. This study has provided a perspective to the detailed description of vertical distribution of SPM.