Hygroscopic growth of tropospheric particle number size distributions over the North China Plain
Hygroscopic growth of tropospheric particle number size distributions over the North China Plain
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DOI：
10.1029/2008jd010921
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发表时间：
2009-04-28
影响因子：
4.4
通讯作者：
Zhu, T.
中科院分区：
文献类型：
--
作者：
Achtert, P.;Birmili, W.;Zhu, T.
在2006年北京及周边地区空气质量研究国际运动（CAREBeijing-2006）研究项目的框架内，对华北平原农村/郊区大气亚微米粒径分布（直径D-p范围为22 ~ 900 nm）的吸湿增长进行了研究。目的是表征中国东北平原污染区的气溶胶特征。通过关联干燥条件下（100 nm）的颗粒数量尺寸分布，确定尺寸描述性吸湿生长因子（DHGF）作为相对湿度（RH）的函数，由于不同的化学组成，DHGF显著高于Aitken颗粒模式（D-p < 100 nm）。尺寸依赖的行为的DHGF突出了颗粒硫酸盐生产的相关性在华北平原，完成二次形成从气相和潜在的，在对流云的液相过程。此外，所有关于DHGF的结果都显示出对气象空气质量的显著依赖性。吸湿增长的积累模式颗粒显着相关的PM 1-硫酸根离子的质量分数通过化学分析确定。最后，这项调查提供了一个参数化的吸湿增长的250 nm的颗粒，这可能是有用的，当预测能见度和辐射强迫和进行大气气溶胶模型验证。
The hygroscopic growth of atmospheric submicrometer particle size distributions (diameter D-p ranging from 22 to 900 nm) was studied at a rural/suburban site in the North China Plain within the framework of the international Campaigns of Air Quality Research in Beijing and Surrounding Region 2006 (CAREBeijing-2006) research project. The goal was to characterize the regional aerosol in the polluted northeastern plain in China. Size descriptive hygroscopic growth factors (DHGFs) were determined as a function of relative humidity (RH) by relating the particle number size distribution at a dry condition ( 100 nm), the DHGF are substantially higher than in the Aitken particle mode (D-p < 100 nm) as a result of different chemical composition. The size-dependent behavior of the DHGF highlights the relevance of particulate sulfate production over the North China Plain, accomplished by secondary formation from the gas phase and, potentially, liquid phase processes in convective clouds. Furthermore, all results concerning the DHGF show a significant dependency on meteorological air masses. The hygroscopic growth of accumulation mode particles correlates significantly with the PM1-mass fraction of sulfate ions determined by chemical analysis. Finally, this investigation provides a parameterization of the hygroscopic growth of 250-nm particles, which might be useful when predicting visibility and radiative forcing and performing atmospheric aerosol model validations.