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	基于FY-3C微波成像仪的沙漠地表发射率反演
其他题名	Retrieval of desert land surface emissivity based on FY-3C microwave radiation imager
	官元红; 郑婷文; 陆其峰; 刘旭林; 钱博; 王文君
来源期刊	地球物理学进展
ISSN	1004-2903
出版年	2020
卷号	35 期号:4 页码:1261-1268
中文摘要	地表发射率是地表的固有属性,也是反演地表信息和大气温湿度廓线的重要参数.为了获取准确且具有具体物理含义的沙漠地区微波地表发射率,首先选取塔克拉玛干沙漠部分地区为反演区域,根据二元函数泰勒定理,推导了该地区的微波地表发射率与地表温度、地表湿度的线性、非线性函数关系.其次,利用最优控制原理,结合FY-3C微波成像仪的观测亮温资料与辐射传输模式(CRTM)模拟亮温数据,构建了沙漠地区微波地表发射率的线性与非线性反演模型.通过对比发现,利用线性和非线性反演模型得到的地表发射率不仅提高了反演区域亮温的模拟精度,而且模拟亮温的变化趋势也与观测更吻合.最后,对地表发射率的线性和非线性反演模型进行了不同时间与空间上的独立性检验,结果表明:除了反演区域外,在整个塔克拉玛干沙漠地区,两种模型反演的地表发射率仍比原地表发射率模拟亮温更接近观测.总的来说,线性和非线性反演模型对沙漠地区的微波地表发射率反演均具有一定的有效性和普适性,且非线性反演模型优于线性反演模型.
英文摘要	Land surface emissivity is an inherent property of land surface, an important condition for retrieving surface and atmospheric parameters,and a key element in land surface data assimilation system.In order to obtain more accurate and physically meaningful microwave land surface emissivity,Firstly,this paper takes Taklimakan desert as the study area,and derives the linear and nonlinear functions of microwave land surface emissivity with respect to surface temperature and surface humidity by Taylor expansion.Secondly,according to the principle of atmospheric radiative transimission and the theory of optimal control,two cost functions are established by combining the observed brightness temperature with its simulated counterpart.Then,the linear and nonlinear retrieval models of microwave land surface emissivity in the hinterland of the Taklimakan desert are obtained by minimizing the cost functions with the Newton iteration method.The results show that the two cost functions decrease quickly,the simulated brightness temperature of CRTM model is very sensitive to the change of land surface emissivity,and the simulated brightness temperature with the retrieval land surface emissivity(new)is more consistent with the observed brightness temperature than the simulated brightness temperature calculated by the original land surface emissivity(old).Furthermore,the spatial and temporal independent tests of the linear and nonlinear retrieval models of land surface emissivity are carried out.It is found that the simulated brightness temperatures calculated by the two retrieval models are obviously improved compared with the old simulated brightness temperatures in the whole Taklimakan desert.The two retrieval models in this paper are also applicable to the retrieval of microwave land surface emissivity for the other desert areas.In general,the nonlinear retrieval model is better than the linear retrieval model.
中文关键词	沙漠地表 ; 微波地表发射率 ; 线性和非线性反演
英文关键词	FY-3C/MWRI FY-3C/MWRI Desert surface Microwave land surface emissivity Linear and nonlinear retrieval
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6801668
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336887
作者单位	官元红, 南京信息工程大学数学与统计学院;;南京信息工程大学, ;;气象灾害预报预警与评估协同创新中心;;气象灾害教育部重点实验室;;气候与环境变化国际合作联合实验室;;中国气象局气溶胶与云降水开放重点实验室, 南京;;南京, ;; 210044;;210044.; 郑婷文, 南京信息工程大学数学与统计学院, 南京, 江苏 210044, 中国.; 王文君, 南京信息工程大学数学与统计学院, 南京, 江苏 210044, 中国.; 陆其峰, 国家卫星气象中心, 中国气象局中国遥感卫星辐射测量和定标重点开放实验室, 北京 100081, 中国.; 刘旭林, 北京市气象探测中心, 北京 100089, 中国.; 钱博, 南京信息工程大学, 气象灾害预报预警与评估协同创新中心;;气象灾害教育部重点实验室;;气候与环境变化国际合作联合实验室;;中国气象局气溶胶与云降水开放重点实验室, 南京, 江苏 210044, 中国.
推荐引用方式 GB/T 7714	官元红,郑婷文,陆其峰,等. 基于FY-3C微波成像仪的沙漠地表发射率反演[J],2020,35(4):1261-1268.
APA	官元红,郑婷文,陆其峰,刘旭林,钱博,&王文君.(2020).基于FY-3C微波成像仪的沙漠地表发射率反演.地球物理学进展,35(4),1261-1268.
MLA	官元红,et al."基于FY-3C微波成像仪的沙漠地表发射率反演".地球物理学进展 35.4(2020):1261-1268.