摘要
本研究采用HUT模型、DMRT模型和MEMLS模型模拟积雪雪粒子与不同波段(18.7 GHz和36.5 GHz)微波相互作用(吸收和消光),并用于辐射传输模型。而雪粒径的获取一直是一个难点,本研究由Jordan91雪粒径演化模型演化得到雪粒径,并将其作为辐射传输模型的输入参数,基于像元内实测数据进行混合像元18.7和36.5 GHz水平极化亮温模拟。结果表明:采用HUT模型、DMRT模型和MEMLS模型的消光系数在18.7 GHz时模拟亮温的偏差分别为-3.6、-1.8和-0.7 K,在36.5 GHz时分别为4.0、10.4和14.4 K。对于18.7 GHz水平极化和36.5 GHz水平极化,基于有效雪粒径的亮温模拟与基于雪粒径演化过程的亮温模拟精度呈现出很好的线性关系。因此,基于雪粒径演化过程的方法是一种合适的获取辐射传输模型中雪粒径参数的方法。
This research used HUT model,DMRT model and MEMLS model to simulate interactions(absorption and extinction) between snow grainsfor different wave bands(18.7 GHz and 36.5 GHz) of microwave which were used for radiative transfer model. Obtaining the snow grain size is always a difficulty. So this research used Jordan91 snow grain size evolution model to evolve snow grain size which was regarded as input parameter of radiative transfer model,and used measured data to simulate spaceborne brightness temperature for 18.7 GHz horizontal polarization and 36.5 GHz horizontal polarization in a mixed pixel. The results showed that the bias of simulation brightness temperature using extinction coefficient of HUT model,DMRT model and MEMLS model for 18.7 GHz horizontal polarization were-3.6 K、-1.8 K and-0.7 K respectively,and for36.5 GHz horizontal polarization were 4.0 K、10.4 K and 14.4 K respectively. For 18.7 GHz horizontal polarization and 36.5 GHz horizontal polarization,the bright temperature simulation based on effective snow grain size shows a good linear relationship with the brightness temperature simulation basedon snow grain size evolution process. Therefore,the method based on the snow grain size evolution process is a suitable method for obtaining the snow grain size parameter in the radiative transfer model.
作者
武黎黎
陈月庆
朱明
李晓峰
赵凯
Wu Lili;Chen Yueqing;Zhu Ming;Li Xiaofeng;Zhao Kai(School of Geographic Sciences,Xinyang Normal University,Xinyang 464000,China;Henan Key Laboratory for Synergistic Prevention of Water and Soil Environmental Pollution,Xinyung Normal University,Xinycuig 464000,China;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China;School of Environment and Plarming,Henan University,Kaifeng,475004,China)
出处
《遥感技术与应用》
CSCD
北大核心
2020年第3期606-614,共9页
Remote Sensing Technology and Application
基金
国家自然科学基金项目(41701395、41871248)。
关键词
积雪粒子
散射特性
亮温模拟
微波成像仪(MWRI)
Snow grain
Scattering characteristics
Brightness temperature simulation
Microwave Radiation Imager(MWRI)
