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JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (6): 1672-1678.DOI: 10.7522/j.issn.1000-694X.2016.00052

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Observation on Distributions of Atmospheric Ice Nuclei Concentration and Size under the Influence of Dust Weather

Zhou Deping, Hong Ye, Wang Yangfeng, Liu Ningwei, Zhang Yunhai, Li Liguang   

  1. Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110016, China
  • Received:2016-01-08 Revised:2016-04-25 Online:2016-11-20 Published:2016-11-20

Abstract: To study the impact of dust weather on atmospheric ice nuclei concentration and size distribution factors, observation of atmospheric ice nuclei was conducted in Shenyang with FA-3 Anderson sampler during spring from 2010 to 2012. The sampling membrane filters were subsequently analyzed in a static diffusion chamber of Chinese Academy of Meteorological Sciences. Based on the data of atmospheric ice nuclei observed on May 11-12 of 2011, we analyzed the atmospheric ice nuclei concentration and size distribution and variation during a typical dust weather process. The results show that the background concentration of atmospheric ice nuclei is high in Shenyang in spring, which is about 0.8 L-1 when the activation temperature is -20℃. The concentration of atmospheric ice nuclei may suddenly increase more than 10 times when dust weather occurs. Two-thirds of atmospheric ice nuclei particles concentrate approximately at greater than 4.7 μm segment, and the concentration of atmospheric ice nuclei of 2.11-5.80 μm diameter segment increases the most obviously during the dust weather process. The particle scale spectrum of the atmospheric ice nuclei approximately obeys exponential distribution, such as n(D)=ADB, where values of A and B are significantly greater in dust days than non-dust days. According to observed facts, it is recommended that to choose the scheme of the artificial rainfall operations carefully in Shenyang and even in northern China in dust days in spring.

Key words: dust weather, Anderson sampler, membrane-diffusion cloud chamber method, atmospheric ice nuclei, scale spectral distribution

CLC Number: