短波红外CO2反演辐射传输模式综述  

Review of Radiative Transfer Model in Retrieval of Atmospheric CO_2 from Satellite Shortwave Infrared Measurements

作　　者：陈曦[1,2] 刘毅[1] 蔡兆男[1] 

机构地区：[1]中国科学院大气物理研究所,中层大气与全球环境探测重点实验室,北京100029 [2]中国科学院大学,北京100049

出　　处：《遥感技术与应用》2015年第5期825-834,共10页Remote Sensing Technology and Application

基　　金：国家863计划重大项目(2011AA12A104);中国科学院战略性先导科技专项(XDA05040200);国家自然科学基金项目(41375035)

摘　　要：高精度的辐射传输计算是保证短波红外卫星遥感反演CO2精度的重要因素之一。地球大气散射辐射一般是偏振的,传统的标量辐射传输模式计算精度无法满足需求;特别是针对美国OCO-2(Orbiting Carbon Observatory-2)、中国TanSat(全球二氧化碳监测科学实验卫星)等跟踪主平面仪器,矢量的辐射传输模式更为必要。在二氧化碳监测卫星的目标模式下,卫星观测角度变化较大,平行平面大气假设不再适用,需要采用伪球面近似以提高精度。本文对适用短波红外CO2反演的辐射传输模式进行总结。首先介绍了基于不同辐射传输方程数值解法的多种辐射传输模式发展概况。针对CO2反演对权重函数的需求,线性化模式可以提供解析权重函数和更为稳定高效的计算方案。接着,简要总结各种线性化矢量辐射传输模式,并进一步分析比较几种CO2反演中常用矢量模式的异同。最后,讨论CO2高精度反演对模式速度的需求和加速优化计算的必要性,对辐射传输加速算法研究现状进行总结。The high precision calculation of radiation is one of the important factors guaranteeing the precision of CO2 retrievals from satellite shortwave infrared measurements.Generally speaking,scattering radiation of earth atmosphere is polarized.So the accuracy of traditional scalar radiative transfer model cannot satisfy our needs about retrieval.Specially,aimed at the instruments tracking principal plane on the American OCO-2（Orbiting Carbon Observatory-2）or Chinese TanSat（Global Carbon Dioxide Monitoring Scientific Satellite）,vector radiative transfer model is more necessary.In target mode of special carbon satellite,the viewing angle of satellite changes so large that the plane-parallel hypothesis is not suitable.Thus we need pseudo-spherical approximation to improve the accuracy.In this article,we summarize radiative transfer models using for atmospheric CO2 retrieval from shortwave infrared measurements.Firstly,the development situation of different kinds of radiative transfer models based on different numerical methods of radiative transfer equation is presented.Aimed at the requirement of CO2 retrieval about weighting function,linearized models can provide analytic weighting function,which are more stable and efficient.Then,we summarize some kinds of linearized vector radiative transfer models briefly.Moreover,the differences and similarities of several common radiative transfer models in CO2 retrieval are analyzed and compared.At last,the requirements of high precision CO2 retrievals about the speed of models and the necessity using acceleration to optimize calculation are discussed.The research about methods of accelerating radiative transfer computation is summerized at the end of the paper.

关 键 词：大气遥感 辐射传输模式 CO2 反演 偏振 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]