雨滴譜分布函數(shù)的選擇:M-P和Gamma分布的對(duì)比研究

doi:10.3969/2012jms.00**

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雨滴譜分布函數(shù)的選擇:M-P和Gamma分布的對(duì)比研究
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P414
基金項(xiàng)目:江蘇省自然科學(xué)基金;南京大學(xué)?？蒲泻徒谈捻?xiàng)目;遼寧省科技廳資助項(xiàng)目

COMPARATIVE STUDY OF EXPONENTIAL AND GAMMA FUNCTIONAL FITS TO OBSERVED RAINDROP SIZE DISTRIBUTION

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摘要:

M-P分布和Gamma分布是常用的兩種雨滴譜分布函數(shù)。利用PMS GBPP-100型雨滴譜儀2003年7-8月在沈陽(yáng)觀測(cè)的雨滴譜資料,采用階矩法對(duì)兩種分布函數(shù)進(jìn)行擬合,對(duì)比分析兩種分布函數(shù)對(duì)譜及數(shù)濃度、雨強(qiáng)和雷達(dá)反射率因子的擬合效果。結(jié)果表明,在降水較弱、小滴偏少時(shí)Gamma分布會(huì)低估小滴,而M-P分布會(huì)高估小滴;降水強(qiáng)時(shí),兩種分布均低估小滴。M-P和Gamma分布對(duì)數(shù)濃度、雨強(qiáng)和雷達(dá)反射率因子這些特征量的擬合效果,在降水較強(qiáng)時(shí)差異很小,在降水較弱時(shí)差異較大。Gamma分布的代表性更好。此外,還討論了兩種分布的參數(shù)和雨強(qiáng)的關(guān)系。

Abstract:

The Marshall-Palmer (M-P) exponential and the gamma functions are widely used to represent characteristics of observed raindrop size distributions.In order to compare the differences in the spectrum,number concentration,rain rate and radar reflectivity factor between the resulting M-P and gamma distribution functions,we use the moment methods to determine parameters for the two fitted functions.Data used here were obtained from Shenyang city in summer in 2003 with PMS GBPP-100 probes.The analysis shows that if observations of raindrop size distributions are fit by using appropriate moments to determine parameters of the fitted functions,it makes a more perfect agreement between fits and observations than using the least squares methods.Differences among the concentrations,rain rate and radar reflectivity factor between the two fitted functions by using moment methods were insignificant for high rain rate,but significant for low rain rate with fewer small drops due to underestimate by the gamma functions and overestimate by the M-P functions.

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鄭嬌恒,陳寶君.雨滴譜分布函數(shù)的選擇:M-P和Gamma分布的對(duì)比研究.氣象科學(xué),2007,(1):17-25 Zheng Jiaoheng, Chen Baojun. COMPARATIVE STUDY OF EXPONENTIAL AND GAMMA FUNCTIONAL FITS TO OBSERVED RAINDROP SIZE DISTRIBUTION. Journal of the Meteorological Sciences,2007,(1):17-25

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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说