李文建^1,2,3, 王珍岩^1,2,4,3,5, 黄海军^1,2,4,3,5
1.中国科学院海洋研究所, 山东 青岛 266071;2.中国科学院海洋地质与环境重点实验室, 山东 青岛 266071;3.中国科学院大学, 北京 100049;4.青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室, 山东 青岛 266071;5.中国科学院海洋大科学研究中心, 山东 青岛 266071

摘要:
根据2012年夏季和2016年冬季在南黄海中部利用原位激光粒度仪（laser in situ scattering and transmissometry，LISST）进行调查获得的实测数据，对两种平均粒径计算方法的结果进行比较研究，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。本文为使用LISST在陆架海区进行现代沉积过程研究提供了参考。
关键词:平均粒径矩值法平均粒级法原位激光粒度仪(LISST)粒径谱
DOI：10.11759/hykx20190909002
分类号:P736.21
基金项目:国家自然科学基金项目（41476045）；中国科学院战略性先导科技专项（A类）（XDA19060401，XDA23050502）；科技部基础资源调查专项（2017FY100802）

Comparative study on calculation of mean size of suspended particulate matter based on the LISST
LI Wen-jian^1,2,3, WANG Zhen-yan^1,2,4,3,5, HUANG Hai-jun^1,2,4,3,5
1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3.University of Chinese Academy of Sciences, Beijing 100049, China;4.Laboratroy for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology Qingdao, Qingdao 266071, China;5.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Abstract:
The mean size of suspended particulate matter is an important parameter for modern deposition process research. 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 laser in situ scattering and transmissometry (LISST), which is non-destructive and efficient. The 32 size classes of the LISST are exponential, and the mean size can be calculated based on the moments method and mean size class method. We conducted the comparative study of the mean size calculation by the two methods based on the in situ data measured by the LISST-100X in the central South Yellow Sea in the summer of 2012 and the winter of 2016. The results showed that the difference in mean size was negligible above the thermocline both in summer or winter. The difference increased with depth under the thermocline due to the increase in fine particle composition. The end-member experiment showed that a 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 areas. This work can guide the study of modern sedimentary processes with LISST in continental shelf sea areas.
Key words:mean sizemoments methodmean size class methodlaser in situ scattering and transmissometry (LISST)particle size distribution





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