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Efficient vector radiative transfer calculations in vertically inhomogeneous cloudy atmospheres

机译：垂直非均匀多云大气中的有效矢量辐射传输计算

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摘要

Accurate radiative transfer calculations in cloudy atmospheres are generally time consuming, limiting their practical use in satellite remote sensing applications. We present a model to efficiently calculate the radiative transfer of polarized light in atmospheres that contain homogeneous cloud layers. This model combines the Gauss-Seidel method, which is efficient for inhomogeneous cloudless atmospheres, with the doubling method, which is efficient for homogeneous cloud layers. Additionally to reduce the computational effort for radiative transfer calculations in absorption bands, the cloud reflection and transmission matrices are interpolated over the absorption and scattering optical thicknesses within the cloud layer. We demonstrate that the proposed radiative transfer model in combination with this interpolation technique is efficient for the simulation of satellite measurements for inhomogeneous atmospheres containing one homogeneous cloud layer. For example, the Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) measurements in the oxygen A band (758-773 nm) and the Hartley-Huggins ozone band (295-335 nm) with a spectral resolution of 0.4 nm can be simulated for these atmospheres within 1 min on a 2.8 GHz PC with an accuracy better than 0.1percent.
机译：在阴天大气中进行精确的辐射传输计算通常很耗时，限制了它们在卫星遥感应用中的实际应用。我们提出了一个模型来有效地计算包含均匀云层的大气中偏振光的辐射传递。该模型将高斯-塞德尔方法（对非均匀无云大气有效）和加倍方法（对均匀云层有效）相结合。另外，为了减少吸收带中辐射传递计算的计算量，在云层内的吸收和散射光学厚度上插值了云的反射和透射矩阵。我们证明，与这种插值技术相结合，提出的辐射传输模型对于模拟包含一个均匀云层的非均匀大气的卫星测量是有效的。例如，可以模拟光谱分辨率为0.4 nm的氧气A波段（758-773 nm）和Hartley-Huggins臭氧波段（295-335 nm）中的大气制图扫描成像吸收光谱仪（SCIAMACHY），在2.8 GHz的PC上，这些气氛在1分钟之内即可达到，其精度优于0.1％。

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