A linearized radiative transfer model for ozone profile retrieval using the analytical forward-adjoint perturbation theory approach
A linearized radiative transfer model for ozone profile retrieval using the analytical forward-adjoint perturbation theory approach
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使用分析前向伴随摄动理论方法进行臭氧剖面反演的线性辐射传输模型
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
T. Trautmann
中科院分区：
文献类型：
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作者：
J. Landgraf;O. Hasekamp;M. Box;T. Trautmann
为了从星载辐射测量中检索臭氧剖面，提出了一种新的线性辐射传输模型 LIRA。该模型能够根据模型大气不同层中的臭氧密度和太阳光谱紫外线中的朗伯表面反照率，对大气顶部的反射率进行有效的线性化。模型的线性化基于前向伴随摄动理论，其中平面平行形式的标量辐射传递方程的前向和伴随解是通过采用Gauss-Seidel迭代技术来实现的。对于晴朗的天空和充满气溶胶的大气，该模型提供反射率及其与臭氧密度相关的导数，精度优于 0.02%。可以计算出关于表面反射的导数，误差小于0.05%。证明了该模型对于臭氧剖面反演的适用性。因此，臭氧剖面是从 156 个建模辐射测量中检索的，模拟了全球臭氧监测实验 (GOME) 光谱仪在紫外线下的真实辐射测量。使用所提出的模型 LIRA 检索的剖面与参考检索的比较显示，平流层和对流层上层的小偏差小于 1%，对流层中层和下层的可容忍差异高达地面平均剖面的 10%。
For the retrieval of ozone profiles from space-borne radiance measurements, a new linearized radiative transfer model LIRA is presented. The model enables an effective linearization of the reflectance at the top of the atmosphere with respect to both the ozone density in the different layers of the model atmosphere and the Lambertian surface albedo in the UV of the solar spectrum. The linearization of the model is based on the forward-adjoint perturbation theory, where the forward and adjoint solution of the scalar radiative transfer equation in its plane-parallel form are achieved by employing the Gauss-Seidel iteration technique. For clear sky and aerosol-loaded atmospheres the model provides the reflectance as well as its derivatives with respect to ozone density with an accuracy of better than 0.02%. The derivatives with respect to surface reflection can be calculated with an error of less than 0.05%. The suitability of the model for ozone profile retrieval is demonstrated. Therefore ozone profiles are retrieved from 156 modeled radiance measurements, simulating real radiance measurements of the Global Ozone Monitoring Experiment (GOME) spectrometer in the UV. The comparison of the retrieved profiles using the proposed model LIRA with a reference retrieval shows small deviations in the stratosphere and upper troposphere of less than 1% and tolerable differences in the middle and lower troposphere of up to 10% in the mean profile at ground level.