New particle formation in Beijing, China: Statistical analysis of a 1‐year data set
New particle formation in Beijing, China: Statistical analysis of a 1‐year data set
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DOI：
10.1029/2006jd007406
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发表时间：
2007-05
影响因子：
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通讯作者：
Zhijun Wu;Min Hu;Shang Liu;B. Wehner;S. Bauer;Andreas Ma ßling;A. Wiedensohler;T. Petäjä;
中科院分区：
文献类型：
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作者：
Zhijun Wu;Min Hu;Shang Liu;B. Wehner;S. Bauer;Andreas Ma ßling;A. Wiedensohler;T. Petäjä;
[1]在中国北京测量了3 nm和10 μm之间的颗粒数尺寸分布。在2004年3月至2005年2月期间，约有40%的测量日观测到新的粒子形成事件，并且通常在相对湿度低和阳光充足的条件下观测到。新粒子形成事件四季均有发生，但春季发生频率最高，夏季最低。事件被分为“干净”或“污染”组，主要是根据凝结汇和当地的风。形成速率范围为3.3 - 81.4 cm-3 s-1。生长速率从0.1到11.2 nm h-1不等。由于光化学和生物活动的增强以及停滞气团阻止与清洁空气的交换，可凝结蒸汽浓度的季节变化在夏季表现出最高值。
[1] Particle number size distributions between 3 nm and 10 μm were measured in Beijing, China. New particle formation events were observed on around 40% of the measurement days from March 2004 to February 2005 and were generally observed under low relative humidity and sunny conditions. Though occurring during all seasons, new particle formation events had highest frequency in spring and lowest frequency in summer. Events were classified as “clean” or “polluted” groups mainly according to the condensational sink and the local wind. The formation rate range was from 3.3 to 81.4 cm−3 s−1. The growth rate varied from 0.1 to 11.2 nm h−1. The seasonal variation of condensable vapor concentration showed the highest values during summer months due to enhanced photochemical and biological activities as well as stagnant air masses preventing exchange with cleaner air.