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基于原位激光粒度仪(LISST)的悬浮体平均粒径计算方法对比研究
李文建, 王珍岩
中国科学院海洋研究所
摘要:
悬浮体平均粒径是研究现代海洋沉积过程的重要粒度参数,对揭示颗粒物沉积环境及水文动力背景具有重要意义。原位激光粒度仪(LISST)可以实现悬浮体粒度的现场快速剖面测量,具有原位、无损、高效测量的优势。LISST的32个粒级呈指数关系分布,对其测量结果进行平均粒径计算存在矩值法与平均粒级法两种算法。本文根据2012年夏季和2016年冬季在南黄海中部进行调查获得的LISST实测数据,对两种方法的计算结果进行比较研究,并对产生差别的原因进行分析。结果表明:无论在夏季和冬季,在温度跃层以上粒度分布以粗颗粒为主,两种计算方法差值较小,可以相互替代。在温盐跃层以下层位,细颗粒组分增加,导致二者计算差值变大。端元分析表明较高的平均粒径值倾向于造成平均粒径差值增大。矩值法强调了粗颗粒组分的贡献,而平均粒级法对细颗粒组分的贡献更加敏感,后者是更适用于将LISST观测数据应用于陆架海区现代沉积环境研究的粒径参数计算方法。
关键词:  平均粒径  矩值法  平均粒级法  LISST  粒径谱
DOI:10.11759/hykx20190909002
分类号:
基金项目:国家自然科学基金项目(面上项目)
Comparative study on calculation of mean size of suspended particulate matter based on the LISST
LI Wenjian, WANG Zhenyan
Institute of Oceanology, Chinese Academy of Sciences
Abstract:
The mean size of suspended particulate matter is an important parameter for modern deposition process researches. It is also of great significance to reveal the sedimentary environment and hydrodynamic background. The in-situ grain size of suspended particulate matter can be measured rapidly by the LISST, which is undamaged and efficient. The 32 size classes of the LISST are exponential, and the mean size can be calculated based on moments method and mean size class method. We conducted the comparative study of the calculation of mean size by the two methods, based on the in-situ data measured by the LISST-100X in the central South Yellow Sea in summer of 2012 and winter of 2016. The results showed that the difference of mean size was negligible above thermocline no matter in summer or winter. The difference increased with depth under the thermocline due to the increase of fine particle composition. The end-member experiment showed that higher mean size tended to cause the higher difference. The moments method highlights the contribution of coarse particles while the mean size class method is sensitive to the fine particles. The latter is more suitable for the study of modern deposition environment in continental shelf sea area.
Key words:  mean size  moments method  mean size class method  LISST  particle size distribution
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