1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China 2. Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China
Abstract：The suspended particle size distribution provides crucial information for the study of water environment structure and function. Based on the in-situ data from wet and dry season in 2008—2011, the paper studied suspended particle size distribution of Poyang Lake and its optical features. The suspended particle size distribution showed seasonal variation: the particle size of southern lake was larger than that of northern lake in dry season but showed little variation in wet season. The suspended particle size distribution exerted influence on particulate absorption coefficient, attenuation coefficient and scattering coefficient. The particulate absorption coefficient of northern lake was higher than that of southern lake. The negative correlation between specific absorption coefficient of total suspended particles and median particle size indicated that there was “package effect” of mineral particles in turbid Poyang Lake. The spatial and temporal distribution of particulate attenuation coefficient and scattering coefficient are similar: there were obvious regional differences in dry season but few in wet season. There were good correlations among the remote sensing reflectance, spectra slope of particle size distribution and spectra slope of particulate scattering coefficient. These correlations would provide the foundation for remote sensing retrieval of particle size and quantitative analysis of influence of suspended particle size on the optical properties. The relationship between particle size distribution, particulate backscattering coefficient and bulk refractive index can provide information of particle composition in Poyang Lake.
Key words：Suspended particles;Size distribution;Scattering properties;Remote sensing retrieval;Poyang Lake
[1] Bowers D G, Binding C E, Ellis K M. Estuarine Coastal and Shelf Science, 2007, 73(3-4): 457. [2] Kostadinov T S, Siegel D A, Maritorena S. Journal of Geophysical Research-Oceans, 2009，114: C09015. [3] HUANG Chang-chun, LI Yun-mei, SUN De-yong，et al(黄昌春, 李云梅, 孙德勇, 等). Acta Optica Sinica(光学学报), 2011，31(5): 501003-1. [4] Astoreca R, Doxaran D, Ruddick K, et al. Continental Shelf Research, 2012，35: 117. [5] Kostadinov T S, Siegel D A, Maritorena S, et al. Applied Optics, 2012, 51(16): 3171. [6] Liu F F, Tang S L, Chen C Q. Remote Sensing Letters, 2013, 4(8): 814. [7] Twardowski M S, Boss E, Macdonald J B. Journal of Geophysical Research-Oceans, 2001, 106(C7): 14129. [8] Mouw C B, Yoder J A. Journal of Geophysical Research-Oceans, 2010，115: 12018. [9] Sun D Y, Li Y M, Wang Q, et al. Hydrobiologia, 2010，644(1): 337. [10] CHEN Li-qiong, CHEN Xiao-ling, TIAN Li-qiao, et al(陈莉琼, 陈晓玲, 田礼乔, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2012，32(3)：729. [11] Wu G F, Cui L J, Duan H T, et al. Applied Optics, 2011，50(34): 6358-6368. [12] ZHANG Ben(张 本). Study of the Poyang Lake(鄱阳湖研究). Shanghai: Shanghai Scientific and Technical Publishers(上海：上海科学技术出版社), 1988. [13] Tang J W, Wang X M, Song Q J, et al. Acta Oceanologica Sinica, 2004，23(4): 10. [14] Feng L, Hu C M, Chen X L, et al. Journal of Geophysical Research, 2012，117(C7): C07006. [15] Stramski D, Babin M, Wozniak S B. Limnol. Oceanogr., 2007，(52): 2418. [16] Wozniak S B, Stramski D, Stramska M, et al. Journal of Geophysical Research-Oceans, 2010，115: C08027.
