Abstract: A simple radiation model was used to calculate daily changes of the aerosol radiative heating rates and cooling rates in different months. Two-stream approximation, hemispheric constant method, adding method and doubling method were applied in the computation. It was demonstrated that in June and December, as far as the daily averaged rates were concerned, whether the aerosol concentration is the heat source or the cold one depends on the aerosol density. However, the relation bears nonlinear features. In the diurnal range, the effects of the aerosol radiative forcing on the atmospheric stability depend on the vertical distribution and density of the aerosol.

Key words: aerosol, long wave radiation, stratification

摘要： 采用两流近似辐射模式，应用半球常数法近似，采用累加法和倍加法，计算了不同月份大气气溶胶的辐射加热率和减温率的日变化。结果表明，从气候角度而言，气溶胶浓度的差别使得即使是在6月份，气溶胶层既可以是冷源也可以是热源；从天气尺度而言，气溶胶的垂直分布和浓度对层结稳定度有着重要影响，并由此从物理上指出了沙尘暴天气过程中辐射效应所起的重要作用。

关键词: 气溶胶, 长波辐射, 层结