研究论文
刘延刚,陈万奎,刘广忠.气溶胶粒子尺度谱特征探讨--一种简单的统计方法[J].环境科学学报,1993,13(1):22-30
气溶胶粒子尺度谱特征探讨--一种简单的统计方法
- INVESTIGATION OF AEROSOL PARTICLE SIZE SPECTRA--A SIMPLE STATISTICAL METHOD
- 摘要：引进偏度偏离系数CS及峰度偏离系数Ck两个无量纲参数,提出了对大量粒子尺度谱资料进行统计分析研究的简单方法。分析了云内、外的粒子尺度谱资料,发现用Gamma分布来近似实测的粒子尺度谱,具有较好的统计代表性;云外的气溶胶粒子分布为超指数分布(μ<0),云内服从次指数分布(μ>0).推导了在Gamma分布条件下,各矩量之间的关系式,指出在粒子尺度谱研究应用中,形状参数μ的特殊重要性.
- Abstract：Based on the skewness and kurtosis, skewness-deviation-coefficient Cs and kurtosis-deviation-coefficient CK are introduced to develop a simple statistical method for a large number of particle size spectrum data. CK-CS relations are derived for the typical aerosol particle size spectra: n(D)=AD-B n(D)=N0 The outcloud and incloud cases show that l)Gamma distribution has the best fit; 2) Outcloud aerosol size spectra are superexponential, whereas incloud aerosol size spectra are subexponential. The relations between comments of the spectra are formulated for Gamma distribution, which implies the importance of the shape parameter μ.
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