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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Monte Carlo calculations of polarized microwave radiation emerging from cloud structures
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Monte Carlo calculations of polarized microwave radiation emerging from cloud structures

机译：云结构发出的极化微波辐射的蒙特卡洛计算

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摘要

The last decade has seen tremendous growth in cloud dynamical and microphysical models that are able to simulate storms and storm systems with very high spatial resolution, typically of the order of a few kilometers. The fairly realistic distributions of cloud and hydrometeor properties that these models generate has, in turn, led to a renewed interest in the three-dimensional microwave radiative transfer modeling needed to understand the effect of cloud and rainfall inhomogeneities upon microwave observations. Monte Carlo methods and particularly backward Monte Carlo methods have shown themselves to be very desirable because of the quick convergence of the solutions. Unfortunately, backward Monte Carlo methods are not well suited to treat polarized radiation. This study reviews existing Monte Carlo methods and presents a new polarized Monte Carlo radiative transfer code. The code is based on a forward scheme but uses biasing techniques to keep the computational requirements equivalent to the backward solution. Radiative transfer computations have been performed using a microphysical-dynamical cloud model, and the results are presented together with the algorithm description.
机译：在过去的十年中，云动力学和微物理模型取得了巨大的发展，这些模型能够以很高的空间分辨率（通常在几千米的数量级）模拟风暴和风暴系统。这些模型生成的相当真实的云和水凝物特性分布反过来引起了人们对三维微波辐射传递模型的新兴趣，该模型需要了解云和降雨不均匀性对微波观测的影响。蒙特卡洛方法，尤其是后向蒙特卡洛方法已经证明，由于解决方案的快速收敛，它们本身是非常理想的。不幸的是，后向蒙特卡洛方法不适用于治疗极化辐射。这项研究回顾了现有的蒙特卡洛方法，并提出了一种新的极化蒙特卡洛辐射转移码。该代码基于前向方案，但使用偏置技术以使计算要求与后向解决方案相同。已经使用微物理动力学云模型执行了辐射传递计算，并与算法描述一起给出了结果。

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