| 摘要: |
| 云通过辐射反馈机制影响着云系的演变过程，对天气和气候系统起重要的调节作用。目前在研究辐射传输问题时普遍采用基于一维平面平行辐射传输的独立柱近似方法，忽略水平云大气柱之间的辐射传输过程，无法考虑三维云辐射效应，由此造成偏差可能影响天气和气候预报的准确性。为此，该文基于Linux系统，采用MCARaTS模式，基于大涡模拟的大气和地表光学性质参数，通过模拟光子随机路径，得到0.67 μm、2.13 μm、11 μm 3个波段下三维蒙特卡罗辐射传输和独立柱近似的向上反射和向下透射的三维辐射通量以及大气加热率空间分布场，通过Matlab进行数据预处理和图表绘制。三维辐射传输模式考虑了在水平方向上的光子传输，得出的辐射场具有真实的三维辐射现象，比独立柱近似模拟结果具有更高的准确性。 |
| 关键词: MCARaTS；蒙特卡罗；独立柱近似；辐射通量；加热率 |
| DOI： |
| 投稿时间：2021-02-17 |
| 基金项目: |
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| Simulation and Analysis of Three-dimensional Cloud Radiative Flux Based on MCARaTS Model |
| XIE Wenjin,ZHANG Lunyu,LI Fan,XIE Yaling,WANG Mengmeng |
| (Pingtang Meteorological Bureau of Guizhou Province,Pingtang 558300 ,China) |
| Abstract: |
| Clouds affect the evolution of the cloud system through the radiation feedback mechanism, and play an important role in regulating weather and climate systems. At present, when studying radiation transmission problems, the independent column approximation method based on one-dimensional plane parallel radiation transmission is generally adopted, which ignored the radiation transmission process between the horizontal cloud and atmospheric column, and do not take the three-dimensional cloud radiation effect into consideration. Consequently, the deviation from it may affect the weather forecasts and the accuracy of climate forecasts. To this end, this paper is, based on the Linux system, using the MCARaTS model, which is based on the atmospheric and ground optical properties parameters simulated by the large eddy, by simulating the random path of photons, to obtain the three-dimensional Monte Carlo radiation transmission and independent transmission in the three bands of 0.67μm, 2.13μm and 11μm.The column approximates the upward reflection and downward transmission of the three-dimensional radiant flux and the spatial distribution field of the atmospheric heating rate, which are preprocessed and graphed by Matlab. The three-dimensional radiation transmission mode considers the photon transmission in the horizontal direction, and the obtained radiation field has a real three-dimensional radiation phenomenon, which is more accurate than the independent column approximate simulation results. |
| Key words: MACRaTS； Monte Carlo； independent column approximation； radiative flux； heating rate |
