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An Evaluation of Ice Nuclei Characteristics from the Long-term Measurement Data over North China
Yin Jinfang,Wang Donghai,Zhai Guoqing 한국기상학회 2012 Asia-Pacific Journal of Atmospheric Sciences Vol.48 No.2
An attempt was made to delineate the characteristics of ice nuclei (IN) over North China using the ground-based measurement data from 1963-2003. The results show that: (1) the IN concentrations increased during the period from 1963-1996, but decreased after 2000; (2) the average IN concentrations range from 1.0 to 26.3,3.6 to 78.9, 19.2 to 627.3, and 92.9 to 5285.0 L−1 at temperature −15,−20, −25, and −30oC, with the overall average of 7.8, 20.6, 167.7,and 890.6 L−1, respectively; and (3) the number concentration of active IN increased nearly exponentially with decreasing temperature,with the slope (ranging from 0.11 to 0.42oC−1) being of a narrow range in a log-linear coordinate; the regression equations for the western central China and the eastern central China can be expressed as N(T) = 0.0396 exp (−0.317ΔT) and N(T) = 0.1496 exp (−0.299ΔT),respectively. The present study may be useful toward applications in models for predicting IN effects on the cloud, precipitation and climate over North China.