APS-SMPS-WPS对南京夏季气溶胶数浓度的对比观测

为了对比3321型空气动力学粒径谱仪(APS)、3081/3085型气溶胶粒径谱仪(SMPS)和宽范围粒径谱仪(WPS)对气溶胶数浓度的观测性能,于2010年夏季在南京信息工程大学校内使用上述三台仪器进行了同步观测.将得到的数据进行对比,并结合校内自动气象站的气象资料对0.01~10μm气溶胶粒子的数浓度、日变化规律及谱分布特征进行分析.结果表明,3台仪器在总体数浓度变化趋势上表现出较好的一致性,但相同粒径段的粒子浓度NSMPS>NWPS>NAPS.SMPS比WPS尺度分辨率高,粒径范围在0.02~0.2μm时,SMPS与WPS相关性较好;APS测量气溶胶数浓度谱的连续性较WPS好.3种仪器在观测日变化趋势上都表现出双峰型,但SMPS的峰值浓度和出现峰值的粒径范围均高于或大于WPS.各类气象条件及降水对仪器间的测量误差影响不大.

Comparative observations on summer aerosol number concentration measured by APS-SMPS-WPS in Nanjing area

To compare and evaluate the performance of three major instruments for aerosol measurement, aerodynamic particle sizer(APS), scanning mobility particle sizer(SMPS) and wide-range particle spectrometer(WPS), a field study was conducted on campus of Nanjing University of Information Science and Technology during the summer of 2010. The number concentrations, size distributions of aerosol particles measured by the three instruments were analyzed and compared, with a focus on the particles between 0.01~10μm in diameter. The variation trends of the particle concentration measured by the three instruments were in good agreement. But differences in absolute values of number concentration measured by the three instruments were also evident with SMPS providing the highest values, followed by WPS. APS showed the lowest concentration in the three instruments. There was a very good correlation between the values measured by SMPS and WPS in the size range between 0.02~0.2μm. In comparison with WPS, APS provided more available size spectra measurements. Bimodal distributions in diurnal variation were captured by all the three instruments, but the peak concentration and the size range measured by SMPS were higher than that by WPS. The differences among the three instruments were not sensitive to meteorological conditions and precipitation.