| 云天地表总辐射和净辐射瞬时值的计算方法 |
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| 引用本文： | 孙治安,刘晶淼,曾宪宁,梁宏.云天地表总辐射和净辐射瞬时值的计算方法[J].气象与环境学报,2014,30(3):1-9. |
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| 作者姓名： | 孙治安 刘晶淼 曾宪宁 梁宏 |
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| 作者单位： | 1. 中国气象局大气环境研究所，辽宁沈阳 110016; 2. Centre for Australian Weather and Climate Research, Australian Bureau of Meteorology, Melbourne3001, Australia; 3. 中国气象局气象科学研究院，北京，100081; 4. 南京信息工程大学，江苏南京 210044 |
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| 基金项目： | 中国气象局沈阳大气环境研究所基本科研业务经费项目;中国气象局气候变化专项(CCSF201313)共同资助 |
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| 摘 要： | 为减少计算机时，满足实时预报要求，全球数值预报模式中的辐射计算频率通常设定为三小时。这样处理会大大减少计算量，但也同时导致较大辐射日变化偏差，并影响模式对地面能量平衡，对流及降水的模拟。为改进这一缺陷，我们开发了一种辐射快速计算方案，可用于计算瞬时地面太阳总辐射和净辐射，使到达地面的太阳辐射计算可与模式积分同步进行，从而改善地面太阳辐射日变化模拟。本文介绍云天的计算方法。该方案所用的输入变量均为预报模式或卫星观测所能提供的量。结果表明：该方案既可用于数值预报模式也可利用观测资料独立计算地面太阳辐射。经与美国能源部大气辐射观测资料检验，该方案的精度很高，地面总辐射瞬时值的平均计算误差小于7%。
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| 关 键 词： | 太阳总辐射 大气透过率 云光学厚度 辐射参数化 |
Estimation of global and net solar radiation at the Earth surface under cloudy-sky condition |
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| SUN Zhi-an,LIU Jing-miao,ZENG Xian-ning,LIANG Hong.Estimation of global and net solar radiation at the Earth surface under cloudy-sky condition[J].Journal of Meteorology and Environment,2014,30(3):1-9. |
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| Authors: | SUN Zhi-an LIU Jing-miao ZENG Xian-ning LIANG Hong |
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| Institution: | 1. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110016, China; 2. Centre for Australian Weather and Climate Research, Australian Bureau of Meteorology, Melbourne3001, Australia; 3. Chinese Academy of Meteorological Sciences, Beijing 100081, China; 4. Nanjing University of Information Scienceand Technology, Nanjing 210044, China |
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| Abstract: | Radiation calculations in global numerical weather prediction (NWP) and climate models are usually conducted in 3-hourly time interval in order to reduce the computational cost. Although great reduction in time consuming, this treatment can lead to an incorrect solar radiation at the Earth’s surface which could be one of the error sources in modeled surface energy budget, convection and precipitation. In order to improve the simulation of the diurnal cycle of the solar radiation, a fast scheme has been developed based on detailed radiative transfer calculations for a wide range of atmospheric conditions and can be used to determine the surface solar radiation at each model integration time step with affordable costs. This scheme is divided into components of clear-sky and cloudy-sky conditions. The cloudy-sky component is introduced in this paper. The results indicate that the input variables required by this scheme are all available in NWP and climate models or can be obtained from satellite observations. Therefore, the scheme can be used in a global model to determine the surface solar radiation. It can also be used as an offline scheme to calculate the surface radiation using data from satellite measurements. The scheme has been tested using observations obtained from three Atmospheric Radiation Measurements (ARM) stations established by the U. S. Department of Energy. The results show that a half hourly mean relative error of global solar radiation under all-sky conditions is less than 7%. |
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| Keywords: | Global solar radiation Atmospheric transmission Cloud optical depth Radiative parameterization |
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