烟雾层的长波辐射效应以及对边界层温度层结的影响

The Longwave Radiative Effect of Smog Layer and Its Influences on the Boundary layer Temperature Stratification

本文利用一个简化的长波辐射方案，计算了兰州城市烟雾层大气的辐射效应．计算表明：烟雾层气溶胶增加了到达地面的大气逆辐射和气层的冷却率，平均污染状况时，增加量分别为15．2％和0．073℃／h．与烟雾层对太阳辐射吸收加热率相比，冷却率量值较小，但对全天边界层能量平衡所起作用不可忽略．对比分析了兰州和郊区夜晚的平均温度廓线演变情况，可以看出烟雾层长波辐射效应增加了低层大气中上部的冷却．

In this paper, the radiative effect of Lanzhou urban smog layer is calculated by using a simplified longwave radiative scheme.The results indicate that the aerosols in smog layer increasethe atmospheric counterradiation reached the ground and the cooling rate in this layer.The in-crement values are 15. 2% and 0.073℃/h, respectively for average polluted condition. Thecooling rate is small compared with solar absorption heating rate in smog layer. But its effecton daily boundary layer energy balance can not bc ignored. By comparing the average temperature profiles of Lanzhou with that of Gaolan,the control site, it can be seen that the smog layer longWave radiation increases the cooling at upper and middle levels of the lower layer.