大气污染对太行山中部地区地表风的影响

The Impact of Air Pollution on the Surface Winds at Central Region of the Mt. Taihang

为了研究大气污染对太行山中部地区地表风的影响,我们对阳泉、榆社(高山站),石家庄、邢台(平原站)4个站点1966～2005年间的能见度、近地面温度、近地面风速数据进行了统计计算与趋势分析。结果显示:在平原站能见度相对山坡站下降更加明显的背景下,平原站的近地面温度、近地面风速、850hPa风速都呈下降趋势;而山坡站的近地面温度、近地面风速呈上升趋势。分析表明:(1)由于气溶胶的辐射效应与冷却效应,抑制了垂直通量的上下传输,致使平原站下午的近地面气温呈下降趋势,平原站和高山站的地表风速呈相反的变化趋势。(2)平原站850hPa(与高山站高度相近)风速呈现下降趋势,印证了高山站的近地面风速增加是气溶胶的辐射效应减弱了垂直能量交换造成的。

To investigate the impact of atmospheric pollution on surface winds in central parts of the Mt. Taihang, statistics calculation and trend analysis have been carried out of the visibility, surface air temperature and surface wind speed data at Yangquan,Yushe （mountain station）, and Shijiazhuang, Xingtai （plain station） during the period of 1966 to 2005. Results showed that： the visibility of plain stations decreased more than that of mountain stations, the surface temperature, the surface wind speed and the wind at 850 hPa of plain stations all showed a downward trend. While the surface temperature,the surface wind speed at mountain stations showed an upward trend. The results showed that ： （ 1 ） Surface air temperature at plain stations drops obviously in the afternoon, whereas surface wind speed at mountain stations exhibit an opposite changing trends to that at plain stations, due to the radiative effect and cooling effect of aerosols inhibiting the transmission of the vertical flux. （2） Wind speed observed from radiosonde sounding data at 850 hPa （ at the same height of the n tion has a downward trend, indicating that the enhancement of the surface wind speed tion effect of the aerosol of aerosol weakening the vertical energy exchange. eighboring mountain station） at plain sta- at mountain stations was due to the radia-