光学学报, 2020, 40 (9): 0901001, 网络出版: 2020-05-06   

大气痕量气体差分吸收光谱仪云量反演算法研究 下载: 1119次

Research on Cloud Fraction Inversion Algorithm of Environmental Trace Gas Monitoring Instrument
作者单位
1 中国科学院安徽光学精密机械研究所环境光学研究中心, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
3 Royal Netherlands Meteorological Institute, KNMI, 荷兰 De Bilt, 3731GA
摘要
主要讨论O2-O2在477 nm处吸收带反演的有效云量。首先通过差分吸收光谱(DOAS)算法反演460~490 nm内的O2-O2斜柱浓度,并对O2-O2斜柱浓度中出现的条带进行修正;然后通过SCIATRAN辐射传输模型设置太阳天顶角、观测天顶角、相对方位角、地表反照率、地面高度、云量、云压等参数的不同节点,创建O2-O2斜柱浓度和反射率的查找表,进一步对查找表进行转换得到云量的查找表;最后对O2-O2斜柱浓度、连续反射率及相关太阳几何信息进行多维插值,得到大气痕量气体差分吸收光谱仪(EMI)有效云量。为验证所提算法的准确性,将EMI结果与OMI(ozone monitoring instrument)云量进行比较,两者均呈由低云量到高云量频数递减的趋势,其中云量为0和云量为1均出现频数高值现象,云量相关性R为0.82,相关性表现良好。
Abstract
In this study, we discuss the O2-O2 inversion effective cloud fraction of the absorption band observed at 477 nm. First, the O2-O2 slant column densities are retrieved in 460--490 nm using the differential optical absorption spectroscopy (DOAS) algorithm, and the stripes occurring in the O2-O2 slant column densities are corrected. Second, the SCIATRAN radiative transfer model is used to set different nodes with respect to solar zenith angle, viewing zenith angle, relative azimuth angle, surface albedo, surface altitude, cloud fraction, and cloud pressure to establish the lookup table of the O2-O2 slant column densities and reflectance. Subsequently, we invert the aforementioned lookup table to obtain the lookup table of cloud fraction. Finally, we use the O2-O2 slant column densities, continuum reflectance, and related solar geometry information to perform multi-dimensional interpolation for obtaining the effective cloud fraction for the environmental trace gas monitoring instrument (EMI). The EMI results are compared with the OMI (ozone monitoring instrument) cloud fraction to verify the accuracy of the proposed algorithm and both denote that the frequency percentages decrease from low cloud cover to high cloud cover. When the cloud fractions are 0 and 1, their frequency percentages are observed to be considerably high. The OMI and EMI cloud fractions are in good agreement and have a high correlation coefficient (R) of 0.82.

杨太平, 司福祺, PingWang, 罗宇涵, 周海金, 赵敏杰. 大气痕量气体差分吸收光谱仪云量反演算法研究[J]. 光学学报, 2020, 40(9): 0901001. Taiping Yang, Fuqi Si, Wang Ping, Yuhan Luo, Haijin Zhou, Minjie Zhao. Research on Cloud Fraction Inversion Algorithm of Environmental Trace Gas Monitoring Instrument[J]. Acta Optica Sinica, 2020, 40(9): 0901001.

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