基于差分光学吸收光谱（different optical absorption spectroscopy, DOAS）技术于2007年1月19日～2月8日期间对位于北京市北四环附近的北京大学校园进行了大气污染物SO2, NO2, HONO和HCHO的连续监测。 并对SO2典型日变化趋势、 主要污染源以及气象条件对污染物浓度分布的影响进行了分析。 结果表明, 在天气状况较为稳定的情况下, SO2具有“V”字型日变化特征, 即除下午浓度较低外, 其余时间浓度均较高。 研究发现北京冬季采暖期间燃煤对大气各污染物的浓度均具有显著贡献。 结合风速等气象要素对污染物扩散、 传输和清除进行的分析可知, 监测期间风速对污染物浓度分布起主导作用, 气压等其它气象状况对污染物浓度分布也有一定的影响。

Based on the differential optical absorption spectroscopy (DOAS) technology, the measurement of air pollutants (SO2, NO2, HONO and HCHO) was performed continuously from Jan 19, 2007 to Feb 8, 2007 in Peking University campus. The typical diurnal variation characteristic of SO2 concentration, the main source and the meteorological factors that influence the pollutants were analyzed. The results indicated that the typical diurnal variation of SO2 concentration has the same shape as the letter “V” when wind speed was low, and in the afternoon the SO2 concentration was the lowest, while in other time it was high. Coal-burning made prominent contribution to the concentration of atmospheric various pollutants in the heating period of Beijing. Wind speed played a leading role and other meteorological factors also have some effect, which resulted from the influence of the meteorology on diffusion, transmission, elimination of air pollutants.