Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6337985 | Atmospheric Environment | 2015 | 31 Pages |
Abstract
The number of cloud condensation nuclei (CCN) may indirectly influence the radiative balance of the atmosphere by changing the number of cloud droplets, which in turn changes the albedo, longevity and precipitation intensity of clouds. The spatial and temporal distribution of the CCN concentrations and the influence of particles on CCN activation spectra have received much attention. Measurements of CCN concentrations, aerosol number-size distribution and hygroscopic growth factors were conducted during the periods June 30 to July 17 and July 24 to 28, 2014, at the peak of Mt. Huang (1840 m above sea level). The results show that the CCN concentration were 419 ± 414 cmâ3, 806 ± 720 cmâ3, 1292 ± 905 cmâ3, 1380 ± 873 cmâ3, and 1506 ± 867 cmâ3 at supersaturation levels of 0.1%, 0.2%, 0.5%, 0.7%, and 1%, respectively. The equation Nccn = N0(1-exp(-BSk)) fits the average CCN spectrum over the observation period. The CCN concentrations were calculated from the hygroscopic growth factors and the aerosol number-size distribution. The calculated CCN concentrations and measured CCN concentrations show close correlation and high accuracy. An analysis of the variation in the particle number-size distribution and hygroscopic growth factors indicates that the change in particle number-size distribution is the primary factor affecting the CCN concentrations.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
Qing Miao, Zefeng Zhang, Yanwei Li, Xin Qin, Bin Xu, Ye Yuan, Zhan Gao,