黄渤海悬浮颗粒物吸收散射效率分布特征及影响因素研究

发布时间：2018-05-29 12:09

  本文选题：悬浮颗粒物 + Mie散射理论　； 参考：《南京信息工程大学》2016年硕士论文

【摘要】：海洋水体悬浮颗粒物吸收、散射效率空间分布特征及其影响因素的研究对于加深水体吸收和散射性质的认识、建立生物光学模型、提高水色遥感反演参数的精度及海洋环境监测等具有重要意义。本文基于2014年11月(秋季)和2015年8月(夏季)在黄渤海开展的现场调查数据,结合测量的黄渤海水体生物、地球、化学及水体环境参数其空间(垂向和表层)分布情况,深入分析了吸收散射效率光谱变化特征、吸收散射效率空间(垂向和表层)分布特征、吸收散射效率与水体组分浓度及悬浮颗粒物成分、粒径、表观密度的关系,揭示了吸收散射效率变化的影响因素。主要结论如下：1) 吸收散射效率光谱特征方面：吸收效率光谱变化特征与水体中悬浮颗粒物的成分有关。以无机颗粒物主导的近岸水体,吸收效率光谱随波长增加而减小；以浮游植物主导的远岸水体,吸收效率光谱分别在440nm、675nm波长处出现吸收效率峰值。散射效率光谱特征整体随波长变化较小且平缓。短波波段散射效率比长波处散射效率略高。夏季散射效率较低,秋季较高。2)吸收散射效率空间分布方面：在水平方向上,吸收效率夏季近岸高、远岸低；秋季近岸低、远岸高。主要是受浮游植物的生长的影响。水平方向上散射效率近岸高、远岸低；秋季散射效率高于夏季。在垂向剖面上,夏季,黄渤海水体整体除具有水平上的近岸高远岸低的分布特征外,吸收效率散射效率深浅水域均呈现出明显的分层结构,上层低下层高。秋季,水深50 m以上水域垂向分布较为均匀,水深大于50 m的水体现出明显的分层结构,上层较低且上均匀层深度较深下层高。3)吸收散射效率影响因素方面：黄渤海悬浮颗粒物主要受浮游植物生长、底部沉积物再悬浮以及垂向混合动力作用的影响。不同海洋过程引起悬浮颗粒物的类型、成分、大小不同,进而光学吸收散射效率不同。吸收效率主要是受水体中叶绿素浓度、悬浮颗粒物粒径、粒径与表观密度乘积等因素共同影响。各影响因素对吸收效率的贡献也各有不同。叶绿素浓度的变化对吸收效率的贡献占33%,较浑浊水体中悬浮颗粒物粒径的变化对吸收效率的贡献为37%,表观密度与粒径的乘积的变化对吸收效率的贡献占14%。散射效率主要是受悬浮颗粒物浓度、粒径及表观密度的影响。粒径的变化对散射效率变化的贡献为15%,表观密度的变化引起散射效率变化的贡献占20%。
[Abstract]:Study on the Spatial Distribution characteristics of suspended particulate matter absorption, scattering efficiency and its influencing factors in Marine Water body; to deepen the understanding of water absorption and scattering properties, and to establish a biological optical model. It is of great significance to improve the precision of remote sensing inversion parameters and marine environment monitoring. Based on the field survey data in the Yellow Sea and Bohai Sea in November (autumn) and August (summer) 2015, the spatial distribution (vertical and surface) of biological, earth, chemical and environmental parameters in the Yellow Sea and Bohai Sea were measured. The spectral variation characteristics of absorption scattering efficiency, the spatial distribution characteristics of absorption scattering efficiency (vertical and surface), and the relationship between absorption scattering efficiency and water component concentration, suspended particle composition, particle size and apparent density are analyzed. The influence factors of absorption and scattering efficiency are revealed. The main conclusions are as follows: (1) the spectral characteristics of absorption and scattering efficiency are related to the composition of suspended particles in water. The absorption efficiency spectra of inshore water dominated by inorganic particulate matter decreased with the increase of wavelength, and the absorption efficiency spectra of far shore waters dominated by phytoplankton showed peak absorption efficiency at the wavelength of 440 nm ~ 675 nm, respectively. The spectral characteristics of scattering efficiency vary slightly with wavelength. The scattering efficiency of short wave band is higher than that of long wave band. The spatial distribution of absorption scattering efficiency is lower in summer, higher in autumn. 2) in horizontal direction, the absorption efficiency is high in summer, low in far shore, and low in autumn. It is mainly affected by the growth of phytoplankton. The scattering efficiency in the horizontal direction is higher in the near shore and lower in the far shore, and the scattering efficiency in autumn is higher than that in summer. In the vertical section, in summer, the whole water body of the Yellow Sea and Bohai Sea has the characteristics of horizontal distribution of the high and far shore, the absorption efficiency scattering efficiency of the deep and shallow waters are obviously layered structure, the upper layer is low and the lower layer is high. In autumn, the vertical distribution of water depth over 50 m is more uniform, and the water with water depth more than 50 m shows obvious stratification structure. The factors affecting the absorption and scattering efficiency of the upper layer are lower and the depth of the upper homogeneous layer is higher. 3) the suspended particles in the Yellow Sea and Bohai Sea are mainly affected by phytoplankton growth, sediment resuspension at the bottom and vertical mixing dynamics. Different marine processes cause different types, compositions and sizes of suspended particulates, thus the optical absorption and scattering efficiency are different. The absorption efficiency was mainly affected by chlorophyll concentration, particle size, particle size and apparent density product. The contribution of each factor to absorption efficiency is different. The contribution of chlorophyll concentration to absorption efficiency was 33. The contribution of particle size change to absorption efficiency was 37. The contribution of the change of apparent density and particle size product to absorption efficiency was 14%. The scattering efficiency is mainly affected by the concentration, particle size and apparent density of suspended particles. The contribution of particle size change to the change of scattering efficiency is 15. The contribution of the change of apparent density to the change of scattering efficiency is 20%.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P732;P734.23
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本文编号：1950830