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引用本文:马荣华,宋庆君,李国砚,潘德炉.太湖水体的后向散射概率.湖泊科学,2008,20(3):375-379. DOI:10.18307/2008.0318
MA Rong-hua,SONG Qing-jun,LI Guo-yan,PAN De-lu.Estimation of backscattering probability of Lake Taihu waters. J. Lake Sci.2008,20(3):375-379. DOI:10.18307/2008.0318
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太湖水体的后向散射概率
马荣华1,2, 宋庆君3, 李国砚1, 潘德炉2
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州 310012;3.国家卫星海洋应用中心, 北京 100081
摘要:
假设2004年10月太湖水体的吸收系数和遥感反射比的测量误差为0,利用生物光学模型,通过优化算法,在光学深水区模拟获得水体的后向散射系数,然后通过后向散射概率和颗粒物后向散射系数之间的定量关系,获得水体中可能真实的颗粒物后向散射概率.结果表明,太湖水体的颗粒物后向散射概率不是一个定值,可以表示为波长的二次函数,在442、488、532、589、676和852nm处分别为0.017、0.017、0.027、0.033、0.054和0.094,均值为0.041,标准偏差为0.030.
关键词:  后向散射概率  后向散射系数  颗粒物质  太湖
DOI:10.18307/2008.0318
分类号:
基金项目:国家自然科学基金(40671138);浙江省自然科学基金重点项目(Z507024);江苏省自然科学基金(BK2007261)联合资助.
Estimation of backscattering probability of Lake Taihu waters
MA Rong-hua1,2, SONG Qing-jun3, LI Guo-yan1, PAN De-lu2
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China;2.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, P.R.China;3.National Satellite Ocean Application Service, Beijing 100081, P.R.China
Abstract:
We assume that the measurement errors of absorption coefficient and remote sensing reflectance are zero in October 2004, Lake Taihu. Then we can employ the optimization algorithm to simulate the backscattering coefficient by the most appropriate bio-optical model especially in the optically deep waters, where the bottom has no influence on remote sensing reflectance. Finally, the possibly real backscattering probability of suspended particulate matter may be approximately calculated by the quantitative relationship between the tested backscattering probabilities and their corresponding backscattering coefficients of suspended particulate matter. The results show that the backscattering probability of suspended particulate matter is not a constant and can be expressed as a quadratic function of wavelength, and the values are 0.017, 0.017, 0.027, 0.033, 0.054 and 0.094 at 442, 488, 532, 589, 676 and 852 nm, respectively; with a mean of 0.041±0.030.
Key words:  Backscattering probability  backscattering coefficient  suspended particulate matter  Lake Taihu
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