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LU Chunsong,LIU Yangang,NIU Shengjie,ZHAO Lijuan,YU Huaying,CHENG Muning.Examination of Microphysical Relationships and Corresponding Microphysical Processes in Warm Fogs[J].J.Meteor. Res.,2013,27(6):832-848
Examination of Microphysical Relationships and Corresponding Microphysical Processes in Warm Fogs
Received: July 30, 2013  Revised: September 04, 2013
DOI:10.1007/s13351-013-0610-0.
中文关键词:  
英文关键词:fog microphysics  microphysical relationships  physical processes  observations
基金项目:
AuthorInstitutionE-mail
LU Chunsong Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;Atmospheric Sciences Division, Brookhaven National Laboratory, NY 11973, US luchunsong110@163.com 
LIU Yangang Atmospheric Sciences Division, Brookhaven National Laboratory, NY 11973, US  
NIU Shengjie Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China  
ZHAO Lijuan Xiamen Environmental Monitoring Central Station, Xiamen 361004, China5 Second Institute of Environmental Assessment, Jiangsu Provincial Academy of Environmental Science, Nanjing 210000, China  
YU Huaying Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China  
CHENG Muning   
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中文摘要:
      
英文摘要:
      In this paper, the microphysical relationships of 8 dense fog events collected from a comprehensive fog observation campaign carried out at Pancheng (32.2°N, 118.7°E) in the Nanjing area, China in the winterof 2007 are investigated. Positive correlations are found among key microphysical properties (cloud droplet number concentration, droplet size, spectral standard deviation, and liquid water content) in each case, suggesting that the dominant processes in these fog events are likely droplet nucleation with subsequent condensational growth and/or droplet deactivation via complete evaporation of some droplets. The abrupt broadening of the fog droplet spectra indicates the occurrence of the collision-coalescence processes as well, although not dominating. The combined effects of the dominant processes and collision-coalescence on microphysical relationships are further analyzed by dividing the dataset according to visibility or autocon-version threshold in each case. The result shows that the specific relationships of number concentration to volume-mean radius and spectral standard deviation depend on the competition between the compensation of small droplets due to nucleation-condensation and the loss of small droplets due to collision-coalescence. Generally, positive correlations are found for different visibility or autoconversion threshold ranges in most cases, although negative correlations sometimes appear with lower visibility or larger autoconversion threshold. Therefore, the compensation of small droplets is generally stronger than the loss, which is likely related to the sufficient fog condensation nuclei in this polluted area.
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