长江口及邻近海域悬浮颗粒物对叶绿素a遥感反演算法的影响分析

发布时间：2018-05-31 05:53

本文选题：叶绿素a + 悬浮颗粒物　；参考：《遥感技术与应用》2016年01期

【摘要】：利用水介质光辐射传输数值模型Hydrolight,结合前人对长江口及邻近海域水体的生物—光学模型研究,模拟不同光学水体的遥感反射率,并分析遥感反射率对悬浮颗粒物(SPM)的敏感性以及SPM对4种叶绿素a(Chla)反演算法(二波段、三波段、荧光基线高度(FLH)和综合叶绿素指数(SCI)算法)的影响。结果表明:由Hydrolight模拟得到的遥感反射率与现场同步实测的遥感反射率的均方根误差小于0.01sr-1,其中可实现遥感反射率在550~725nm波段较精确的模拟。遥感反射率对SPM的敏感性随着Chla浓度的升高而降低。二波段、三波段算法适合低SPM浓度水体的Chla浓度反演,FLH算法反演Chla浓度时易受SPM的影响,而SCI算法在中、高SPM浓度水体中消除SPM的影响进而反演Chla的潜力较好。
[Abstract]:The remote sensing reflectivity of different optical water bodies was simulated by using the numerical model of optical radiation transfer in water medium, Hydrolight, and the biological optical model of the Changjiang Estuary and its adjacent waters. The sensitivity of remote sensing reflectance to suspended particulate matter (SPM) and the effect of SPM on four kinds of chlorophyll Chla inversion algorithms (two-band, three-band, fluorescence baseline height and synthetic chlorophyll index) were analyzed. The results show that the RMS error of the remote sensing reflectance simulated by Hydrolight is less than 0.01sr-1, and the RMS error of the remote sensing reflectivity measured in situ is less than 0.01sr-1. The simulation of remote sensing reflectance in 550~725nm band can be realized accurately. The sensitivity of remote sensing reflectance to SPM decreases with the increase of Chla concentration. In the second band, three band algorithm is suitable for the Chla concentration inversion of low SPM concentration water. The SCI algorithm is susceptible to the influence of SPM in the retrieval of Chla concentration, while the SCI algorithm can eliminate the influence of SPM in the medium and high SPM concentration water and thus has better potential for Chla inversion.
【作者单位】：华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金项目(41271375) 教育部博士学科点专项科研基金(20120076110009)
【分类号】：P715.7

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