Characteristics of Raindrop Falling Process at the Mount Huang

Yuan Ye; Zhu Shichao; Li Aihua

doi:10.11898/1001-7313.20160610

Vol.27, NO.6, 2016

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Article Navigation > Journal of Applied Meteorological Science > 2016 > 27(6): 734-740

Yuan Ye, Zhu Shichao, Li Aihua. Characteristics of raindrop falling process at the Mount Huang. J Appl Meteor Sci, 2016, 27(6): 734-740. DOI: 10.11898/1001-7313.20160610.

Citation:

Yuan Ye, Zhu Shichao, Li Aihua. Characteristics of raindrop falling process at the Mount Huang. J Appl Meteor Sci, 2016, 27(6): 734-740. DOI: 10.11898/1001-7313.20160610.

Yuan Ye, Zhu Shichao, Li Aihua. Characteristics of raindrop falling process at the Mount Huang. J Appl Meteor Sci, 2016, 27(6): 734-740. DOI: 10.11898/1001-7313.20160610.

Citation:

Yuan Ye, Zhu Shichao, Li Aihua. Characteristics of raindrop falling process at the Mount Huang. J Appl Meteor Sci, 2016, 27(6): 734-740. DOI: 10.11898/1001-7313.20160610.

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Characteristics of Raindrop Falling Process at the Mount Huang

DOI: 10.11898/1001-7313.20160610

Anhui Weather Modification Office, Hefei 230031

Received Date: 2016-02-04
Rev Recd Date: 2016-06-13
Publish Date: 2016-11-30

Abstract

Abstract

Utilizing raindrop spectrum data recorded by PARSIVEL of April-Octomber from 2011 to 2012 at the top and foot of the Mount Huang, 17 precipitation cases are collected, which divided into convective cloud precipitation and stratiform cloud precipitation. Characteristics of raindrop spectrum in different height and cloud from 17 precipitation cases are analyzed.Observed results show that the average concentration of raindrops at the top of the mountain is higher than that at the foot of the mountain in both convective cloud and stratiform cloud precipitation, the average peak diameter and the average mass median diameter both increase during falling process, but average intensity and radar reflectivity both have a smaller change. Neither convective cloud nor stratiform cloud raindrop spectrum distribution broadens from top to foot of the Mount Huang, but the spectrum shapes of raindrop change from M-P (Marshall-Palmer) to Gamma. Raindrop loses at most bins when falling from top to foot of the mountain, the maximum loss appears at the third bin of raindrop spectrum, with the loss percentage exceeding 50%. The concentration of bigger raindrop of stratiform cloud begins at the 11th bin (with feature diameter of 1.375 mm) and convective cloud raindrop begin at the 13th bin (with feature diameter of 1.875 mm) increase during falling process. The increase amplitude is lower than 10% except the 12th bin (with features diameter of 1.625 mm) and the 13th bin of stratiform cloud raindrop, and the increase at these two bins are 10.8% and 11.9%, respectively. Evaporation accompanies with the whole falling process, which has bigger effects on small raindrops than big ones, leading to lower concentration of smaller raindrop at the foot of the mountain. These losses gradually reduce along with raindrop diameter increasing due to effects of coagulation process of raindrop become stronger along with raindrop diameter increasing. Therefore, these changes occurring during falling process may be caused by both evaporation and coagulation process of raindrop.
- raindrop spectrum;
- the Mount Huang;
- convective cloud;
- stratiform cloud

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References(23)

Figures and Tables

图 1 山顶和山底两站平均雨滴谱对比

(a) 对流云，(b) 层状云

Fig. 1 Comparison of average raindrop spectrum at top and foot of the mountain

(a) convection cloud, (b) stratiform cloud

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Fig. 2 Average raindrop concentration of diffirent cloud at top and foot of the mountain

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Table 1 Bin diameter of PARSIVEL

通道	特征直径/mm
3	0.312
4	0.437
5	0.562
6	0.687
7	0.812
8	0.937
9	1.062
10	1.187
11	1.375
12	1.625
13	1.875
14	2.125
15	2.375
16	2.75
17	3.25
18	3.75
19	4.25
20	4.75
21	5.5
22	6.5
23	7.5
24	8.5

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Table 2 Time and duration of sample

采样序号	采样起始时间	采样终止时间	时长/min
1	2011-06-13T22:00	2011-06-15T18:59	2700
2	2011-06-24T15:00	2011-06-26T02:00	2100
3	2011-08-03T05:01	2011-08-03T09:00	240
4	2011-08-07T02:01	2011-08-07T16:00	840
5	2011-08-09T16:00	2011-08-09T19:59	240
6	2011-08-10T21:00	2011-08-12T09:59	2220
7	2011-08-29T12:01	2011-08-31T14:00	3000
8	2011-09-17T14:00	2011-09-18T02:59	780
9	2011-10-24T01:00	2011-10-24T23:59	1380
10	2012-04-20T10:00	2012-04-21T09:59	1440
11	2012-04-23T21:00	2012-04-25T06:59	2040
12	2012-05-07T20:01	2012-05-08T12:00	960
13	2012-05-12T15:01	2012-05-13T07:00	960
14	2012-05-23T00:00	2012-05-26T08:59	4860
15	2012-06-10T19:00	2012-06-11T07:59	780
16	2012-06-17T07:00	2012-06-18T13:59	1860
17	2012-06-25T15:00	2012-06-28T04:59	3730

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Table 3 Cloud and precipitation parameters at diffirent sites and cloud types

站点	云型	样本量	平均数浓度/m^-3	平均雨强/ (mm·h^-1)	平均含水量/ (g·kg^-1)	平均反射率因子/dBZ	平均峰值直径/mm	平均质量半数直径/mm
山顶站	对流云	912	1482	19.5	1.12	40.0	0.50	0.88
山底站	对流云	897	1024	21.4	0.96	39.6	0.70	1.00
山顶站	层云	19122	422	1.6	0.097	18.9	0.55	0.66
山底站	层云	17017	269	1.7	0.09	19.6	0.64	0.72

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