黄渤海悬浮颗粒物粒径的遥感反演研究  

Remote Sensing of Suspended Particle Size in Yellow Sea and Bohai Sea

作　　者：陈亚慧[1,2] 丘仲锋[2] 孙德勇[2] 王胜强[2] 何宜军[2] 

机构地区：[1]南京信息工程大学地理与遥感学院,江苏南京210044 [2]南京信息工程大学海洋科学学院,江苏南京210044

出　　处：《光学学报》2015年第9期50-59,共10页Acta Optica Sinica

基　　金：国家自然科学基金(41276186);江苏省自然科学基金(SBK2015020625);"全球变化与海气相互作用"专项资助(GASI-03-03-01-01);国家海洋公益性行业专项(201005030;201305012);南京信息工程大学人才启动基金(2243141501007)

摘　　要：悬浮颗粒物粒径是重要的海洋光学参数,在以悬浮颗粒物为主的黄渤海海域,对水体生物、化学过程等起着重要的作用,该参数的卫星遥感反演也对海洋光学与水色遥感研究具有重要意义。利用2014年5月和11月的黄渤海47组实测数据,建立了基于静止海洋水色卫星(GOCI)波段设置的遥感反射率(Rrs)与悬浮颗粒物中值粒径(D50)反演模型,555 nm波段幂函数的反演效果最佳,决定系数R2为0.72,绝对误差SMAPE为6.35%,经实测数据检验,均方根误差SRMSE约为0.17,相对误差变化范围为-5%~5%。对反演模型引入5%误差进行敏感性检验,绝对误差、均方根误差分别控制在2%以及0.002以内,具有较好的稳定性。将此模型运用于2013年6月GOCI卫星数据,反演出悬浮颗粒物中值粒径D50的时空分布图,呈现从近岸向远海粒径逐渐变大的趋势。Suspended particle size is an important marine optical parameter. In Yellow Sea and Bohai Sea, suspended particle size plays an important role in marine biogeochemical processes and ocean color remote sensing, since a large quantity of sediments dominate water composition in this study area. Using 47 in situ samples collected in May and November 2014, based on Geostationary Ocean Color Imager （GOCI） band, a novel inversion model is developed to estimate the median diameter （D20） of suspended particle sizes, by means of remote sensing reflectance （Rra）. The obtained results indicate that a power model by Rra（555 nm） performs best, coefficient of determination R2 is 0.72, mean absolute percentage error SMAPE is 6.35%. AS for model validation, the root mean square error （SRMSE） by using the independent dataset shows a value of about 0.17, and the relative errors ranged from -5% to 5%. The robustness of the developed models is investigated by introducing 5% random error into original data, and the corresponding results show that S^APE is below 2%, and SRMSE is less than 0.002. Additionally, the model is successfully applied to derive distribution map of D50 from GOCI data （Jun, 2013）, and the results show that the diameters of suspended particles increas from near-shore region to off-shore waters.

关 键 词：遥感 悬浮颗粒物粒径 反演算法 GOCI卫星 海洋光学 

分 类 号：O433[机械工程—光学工程] P733.3[理学—光学]