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11.
半干旱区气溶胶散射特性研究 总被引：16，自引：8，他引：8
利用2005年1月至9月锡林浩特观象台积分浊度计的观测资料,结合同期的PM10质量浓度、能见度以及常规气象资料,分析了半干旱地区气溶胶的散射系数变化特征,讨论了它的季节变化、日变化、不同沙尘天气下气溶胶散射系数的变化情况,以及散射系数与PM10质量浓度、能见度的关系。结果表明1月至9月散射系数总体呈先下降再升高的趋势,日变化呈明显的双峰型;散射系数能很好的反映沙尘天气的强度;它与PM10质量浓度变化规律基本一致,两者之间具有很好的相关性;散射系数与能见度呈指数相关关系。 相似文献
12.
B. A. Bodhaine E. G. Dutton J. J. DeLuisi G. A. Herbert G. E. Shaw A. D. A. Hansen 《Journal of Atmospheric Chemistry》1989,9(1-3):213-224
Measurements at Barrow during the second Arctic Gas and Aerosol Sampling Program (AGASP-II), conducted in April 1986, showed no rapid long-range transport from lower-latitude source regions to Barrow, and only limited vertical transport from above the boundary layer to the surface. New aerosol size distribution measurements in the 0.005–0.1 m diameter size range using a Nuclepore-filter diffusion battery apparatus showed a median diameter of about 0.01 m during times of high condensation nucleus (CN) concentrations. Aerosol black carbon concentrations exceeding 400 ng m–3 were detected at the surface and were more strongly correlated with CN concentrations than with aerosol scattering extinction (sp), suggesting that aerosol carbon was generally associated with small particles rather than large particles. Measurements at Barrow during AGASP-I, conducted in March–April 1983, showed a series of aerosol events detected at the ground that were caused by rapid long-range transport paths to the vicinity of Barrow from Eurasia. These events were strongly correlated with aerosol loading in the vertical column (optical depth). 相似文献