Abstract
A set of vertical profiles of aerosol number concentrations, size distributions and cloud condensation nuclei (CCN) spectra was observed using a passive cloud and aerosol spectrometer (PCASP) and cloud condensation nuclei counter, over the Tongliao area, East Inner Mongolia, China. The results showed that the average aerosol number concentration in this region was much lower than that in heavily polluted areas. Monthly average aerosol number concentrations within the boundary layer reached a maximum in May and a minimum in September, and the variations in CCN number concentrations at different supersaturations showed the same trend. The parameters c and k of the empirical function N = cS k were 539 and 1.477 under clean conditions, and their counterparts under polluted conditions were 1615 and 1.42. Measurements from the airborne probe mounted on a Yun-12 (Y12) aircraft, together with Hybrid Single-Particle Lagrangian Integrated Trajectory model backward trajectories indicated that the air mass from the south of Tongliao contained a high concentration of aerosol particles (1000–2500 cm−3) in the middle and lower parts of the troposphere. Moreover, detailed intercomparison of data obtained on two days in 2010 indicated that the activation efficiency in terms of the ratio of N CCN to N a (aerosols measured from PCASP) was 0.74 (0.4 supersaturations) when the air mass mainly came from south of Tongliao, and this value increased to 0.83 on the relatively cleaner day. Thus, long-range transport of anthropogenic pollutants from heavily polluted mega cities, such as Beijing and Tianjin, may result in slightly decreasing activation efficiencies.
摘要
气溶胶直接和间接辐射效应是目前气候研究的重点之一, 而目前中国气溶胶及CCN飞机直接观测数据的时空分布较为稀疏. 有鉴于此, 本文利用2010-2011年5月–9月内蒙东部通辽地区飞机搭载PCASP及CCN计数器的观测资料, 重点分析了该地区气溶胶及CCN的分布特征. 统计结果表明, 该地区气溶胶(0.1–3μm)的平均值在各个高度层上均远小于北京及其周边重污染地区, 接近于典型清洁地区的分布情况. 边界层内气溶胶数浓度的均值在5–7月份较高, 8–9月份较低, 与MODIS AOD的变化趋势基本一致. 另外, 利用飞机观测资料结合HYSPLIT后向轨迹模拟, 重点分析了2010年8月8日及8月15日两天不同的空气团对CCN数浓度及活化率的影响. 结果显示, 来自华北等高污染地区的空气团可显著增加CCN数浓度, 但同时降低了CCN活化率.
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Acknowledgements
This article was jointly supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA05100304) and the Chinese Natural Science Foundation (Grant Nos. 41475028 and 41405128). The authors are grateful to NASA/GSFC for the use of their MODIS Level 2 aerosol products, and the NOAA Air Resources Laboratory for the provision of the HYSPLIT transport and dispersion model. The authors express thanks to the aircraft observations team of China Fly Dragon Special Aviation Company and the Weather Modification Office, Tongliao Meteorology Bureau.
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Yang, J., Lei, H. & Lü, Y. Airborne observations of cloud condensation nuclei spectra and aerosols over East Inner Mongolia. Adv. Atmos. Sci. 34, 1003–1016 (2017). https://doi.org/10.1007/s00376-017-6219-y
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DOI: https://doi.org/10.1007/s00376-017-6219-y