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首页> 外文会议>International symposium on atmospheric and ocean optics: atmospheric physics >Regarding retrievals of methane in the atmosphere from IASI/Metop spectra and their comparison with ground-based FTIR measurements data
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Regarding retrievals of methane in the atmosphere from IASI/Metop spectra and their comparison with ground-based FTIR measurements data

机译：关于从IASI / Metop光谱中获取大气中的甲烷并将其与地面FTIR测量数据进行比较

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摘要

The algorithm for atmospheric methane distribution retrieval in atmosphere from IASI spectra has been developed. The feasibility of Levenberg-Marquardt method for atmospheric methane total column amount retrieval from the spectra measured by IASI/METOP modified for the case of lack of a priori covariance matrices for methane vertical profiles is studied in this paper. Method and algorithm were implemented into software package together with iterative estimation of a posteriori covariance matrices and averaging kernels for each individual retrieval. This allows retrieval quality selection using the properties of both types of matrices. Methane (XCH4) retrieval by Levenberg-Marquardt method from IASI/METOP spectra is presented in this work. NCEP/NCAR reanalysis data provided by ESRL (NOAA, Boulder, USA) were taken as initial guess. Surface temperature, air temperature and humidity vertical profiles are retrieved before methane vertical profile retrieval. The data retrieved from ground-based measurements at the Ural Atmospheric Station and data of L2/IASI standard product were used for the verification of the method and results of methane retrieval from IASI/METOP spectra.
机译：已经开发了从IASI光谱中检索大气中甲烷分布的算法。研究了在缺乏甲烷垂直剖面的先验协方差矩阵的情况下，利用IASI / METOP修改后的光谱从Levenberg-Marquardt方法检索大气甲烷总柱量的可行性。将方法和算法与后验协方差矩阵的迭代估计以及每个个体检索的平均内核一起实现到软件包中。这允许使用两种类型的矩阵的属性来选择检索质量。这项工作介绍了通过Levenberg-Marquardt方法从IASI / METOP光谱中提取甲烷（XCH4）。由ESRL（NOAA，美国博尔德，美国）提供的NCEP / NCAR再分析数据被视为最初的猜测。在甲烷垂直剖面检索之前，先获取表面温度，空气温度和湿度垂直剖面。从乌拉尔大气站的地面测量中获取的数据和L2 / IASI标准产品的数据用于验证方法和从IASI / METOP光谱中提取甲烷的结果。

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