祁连山南麓夏季不同降水云系雨滴谱特征及其Z-R关系

doi:10.13866/j.azr.2021.04.16

Abstract

Abstract:

The microphysical characteristics, raindrop spectrum distribution, particle falling velocity, and Z-R relationship of the precipitation particle spectrum in different precipitation cloud systems (stratiform cloud and convective cloud) in the southern foothold of Qilian Mountains were analyzed using laser raindrop spectrometer observation data from August to September of 2019. The results show that the microphysical parameters of convective cloud precipitation in summer in the Qilian Mountains were all larger than those of stratiform cloud precipitation, and the different stages of convective cloud development had a substantial influence on the rain intensity and microphysical parameters of raindrops. The actual raindrop distribution in summer was most similar to a Gamma distribution in Qilian Mountain, but both an M-P distribution and Gamma distribution led to the overestimation of raindrop concentration. The falling velocities of raindrops at different scales were different, and at the same scale, the range of particle velocities in convective cloud precipitation was slightly larger than that in stratiform cloud precipitation. The fitting curves of traditional particle velocities were underestimated. The Z-R relationship of summer stratiform cloud precipitation in the Qilian Mountain was Z=445R ^1.50 and that of convective cloud precipitation was Z=427R ^1.88. The traditional radar precipitation estimation method underestimated precipitation in this area.

Key words: raindrop size distribution, convective precipitation, stratiform precipitation, microphysical characteristics, Qilian Mountains

ZHANG Yuxin,HAN Huibang,GUO Shiyu,TIAN Jianbing,TANG Wentin. Statistical characteristics of raindrop size distribution and its Z-R relationship for different precipitation clouds in summer in the Qilian Mountains[J].Arid Zone Research, 2021, 38(4): 1048-1057.

Figures/Tables 9

Fig. 1

Tab. 1

Fig. 2

Fig. 3

Fig. 4

Tab. 2

The mean spectrum parameters of Gamma and M-P distribution fitting and correlation coefficient"

分类	M-P分布			Gamma分布
分类	$N 0$	λ	r	$N 0$	λ	μ	r
S	514.73	2.94	0.98	385.06	7.61	-2.49	0.98
C	514.72	2.31	0.89	365.79	7.50	-2.76	0.88

Tab. 2

Fig. 5

Fig. 6

Tab. 3

References 31

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站点	样本数总数(1 min)	层状云样本数(占比)	对流云样本数(占比)
老龙湾	1275	811(63.6%)	464(36.4%)
讨拉	7523	5284(70.2%)	2239(29.8%)
大拉洞	4562	3885(85.2%)	677(14.8%)
总和	13360	9980(74.7%)	3380(25.3%)

观测站点	Z=aR^b		降水类型	文献来源
观测站点	a	b	降水类型	文献来源
祁连山南麓	445	1.50	层状云	本研究
祁连山南麓	427	1.88	对流云	本研究
黄河上游	461	1.06	积云	[7]
北京	170	1.13	层状云	[9]
北京	544	1.31	对流云	[9]
沈阳	108.9	1.41	层状云	[12]
	136.6	1.43	积层混合云
	149.2	1.46	积雨云
哈尔滨	189.8	1.37	层状云
	192.6	1.38	积层混合云
	227.1	1.45	积雨云
北京	674.91	1.39	强降水	[13]
山东	27.678	0.396	层状云	[27]
	24.586	0.871	积雨云
	25.330	0.866	积层混合云
山西	160	1.32	层状云	[28]
山西	273	1.26	对流云	[28]

Statistical characteristics of raindrop size distribution and its Z-R relationship for different precipitation clouds in summer in the Qilian Mountains

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