A synoptic reflux process of westerly trough occurred over the central and southern part of Hebei Province on 15 April 2014.The airplane detection on cloud physics combined with the artificial seeding operation was conducted by the Hebei Province Weather Modification Office, besides, a special flight route was designed to investigate the variation of the micro and macro physical parameters before and after the operation in this paper.This precipitation cloud system characteristics were analyzed based on the airborne Particle Measurement System (PMS) observation dataset, the radar and the satellite data.It is found that precipitation in the upper layer of "pre-trough cloud" was weaker than that in the lower reflux cloud, with no high cloud present.The descending precipitation particles growed in the "reflux cloud" during the operation observation, with large amounts of precipitation particles smaller than 3 mm in diameter existing in this layer.Small cloud particle number concentration normally was higher than 20 cm-3, with a maximum of 300 cm-3 in the operation layer.Large cloud particles number concentration lied below 0.02 cm-3.The macro and micro physical responses of cloud after the operation are as follows:The FY-2 satellite cloud image brightness temperature reduced from -25℃ to about -30℃, and the middle clouds developed with increased cloud top; Radar echo intensity increased after the seeding operation with a maximum intensity of 45 dBZ.The radar echo area larger than 35 dBZ in cloud was also increased; According to the radar sectional profile, the strong radar echo area dropped to 500~1000 m; Small cloud particles and large cloud particles number concentration were both increased, with precipitation number concentration increased first and then reduced, and the process lasted about 25 minutes based on the PMS observation dataset; The precipitation particle size distribution presented a bimodal distribution, with the second peak located at 10.5 μm.The number concentration of particles with diameters between 10.5~150 μm decreased exponentially.However, there was no significant change on the number concentration of particles with diameters between 150 to 1000 μm, although their diameters were found to be increased rapidly.The sharp decrease of the number concentration of particles with diameter larger than 1000 μm was associated with the particle deposition mechanism.The effective diameter of cloud moved to a higher value with a more disperse distribution of the average diameter, the square root diameter and cube root diameter, indicating a discrete particle distribution.The precipitation increased and kept three hours after the operation.
SUN Yuwen
,
YIN Yan
,
SUN Xia
,
LIU Wei
,
HAN Yang
,
YAN Xusheng
. Observation and Study of Macro and Micro Response in Cold Cloud Catalysis[J]. Plateau Meteorology, 2017
, 36(5)
: 1290
-1303
.
DOI: 10.7522/j.issn.1000-0534.2016.00113
[1]Rosenfeld D, Woodley W L.1993.Effects of cloud seeding in west Texas:Additional results and new insights[J].J Appl Meteor, 32(12):1848-1866.
[2]Houze R A, Hobbs P V, Herzegh P H, et al.1979.Size dist ributions of precipitation particles in frontal clouds[J].J Atmos Sci, 36:156-162.
[3]Rangno A L, Hobbs P V.2005.Microstructures and precipitation development in cumulus and small cumulonimbus clouds over the warm pool of the tropical Pacific Ocean[J].Quart J Roy Meteor Soc, 131:639-673.
[4]Cai Miao, Zhou Yuquan, Ou Jianjun, et al.2015.Study on diagnosing there dimensional cloud region[J].Plateau Meteor, 34(5):1330-1344.DOI:10.7522/j.issn.1000-0534.2014.00061.<br/>蔡淼, 周毓荃, 欧建军, 等.2015.三维云场分布诊断方法的研究[J].高原气象, 34(5):1330-1344.
[5]Cai Zhaoxin, Zhou Yuquan, Cai Miao.2013.Analysis on comprehensive observation of artificial precipitation enhancement operation for a convective-stratiform mixed cloud[J].Plateau Meteor, 32(5):1460-1469.DOI:10.7522/j.issn.1000-0534.2012.00115.<br/>蔡兆鑫, 周毓荃, 蔡淼.2013.一次积层混合云系人工增雨作业的综合观测分析[J].高原气象, 32(5):1460-1469.
[6]Hong Yanchao, Li Hongyu.2011.Cloud structure, precipitation mechanism and artificial enhancement precipitation condition for a frontal stratiform cloud system[J].Plateau Meteor, 30(5):1308-1323.<br/>洪延超, 李宏宇.2011.一次锋面层状云云系结构、降水机制及人工增雨条件研究[J].高原气象, 30(5):1308-1323.
[7]Ju Liling, Niu Shengjie, Duan Ying, et al.2011.Observational study on vertical microphysical structure of an autumn clold-front cloud in Shijiazhuang Region[J].Plateau Meteor, 30(5):1324-1366.<br/>居丽玲, 牛生杰, 段英, 等.2011.石家庄地区一次秋季冷锋云系垂直微物理结构的观测研究[J].高原气象, 30(5):1324-1336.
[8]Li Lunge, De Ligeer.2001.Analyses of microphysical features for spring precipitation cloud layers in east of Qinghai[J].Plateau Meteor, 20(2):191-196.<br/>李仑格, 德力格尔.2001.高原东部春季降水云层的微物理特征分析[J].高原气象, 20(2):191-196.
[9]Sun Jing, Yang Wenxia, Zhou Yuquan.2015.Numerical Simulations of Cloud Structure and Seedability of a Precipitating Stratiform in Hebei[J].Plateau Meteor, 34(6):1699-1710.DOI:10.7522/j.issn.1000-0534.2014.00086.<br/>孙晶, 杨文霞, 周毓荃.2015.河北一次降水层状云系结构和增雨条件的模拟研究[J], 高原气象, 34(6):1699-1710.
[10]Sun Yuwen, Li Baodong, Liuwei, et al.2015a.Study on physical structure of Hebei Stratiform cloud in Autumn and its seedability condition[J].Plateau Meteor, 34(1):237-250.DOI:10.7522/j.issn.1000-0534.2013.00172.<br/>孙玉稳, 李宝东, 刘伟, 等.2015a.河北秋季层状云物理结构及适播性分析[J].高原气象, 34(1):237-250.
[11]Sun Yuwen, Sun Xia, Liu Wei, et al.2015b.Study of integrated observation on artificial operation during a sleet event[J].Meteor Mon, 41(11):1341-1355.<br/>孙玉稳, 孙霞, 刘伟, 等.2015b.一次雨夹雪降水过程人工增水作业的综合观测研究[J].气象, 41(11):1341-1355.
[12]Tao Shuwang, Liu Weiguo, Li Niantong, et al.2001.A study of real-time identification of seedability of cold stratiform clouds[J].Quart J Appl Meteor, 12(Suppl):14-22.<br/>陶树旺, 刘卫国, 李念童, 等.2001.层状冷云人工增雨可播性实时识别技术研究[J].应用气象学报, 12(增刊):14-22.
[13]Xu Huanbin.2009.On the ideal renew in weather modification[J].J Arid Meteor, 27(4):305-307.<br/>许焕斌.2009.关于在人工影响天气中更新学术观念的探讨[J].干旱气象, 27(4):305-307.
[14]Ye Peilong, Wang Tianhe, Shang Kezheng, et al.2014.Analysis of cloud vertical structure over Western China besed on active satellite dated[J].Plateau Meteor, 33(4):977-987.DOI:10.7522/j.issn.1000-0534.2013.00158.<br/>叶培龙, 王天河, 尚可政, 等.2014.基于卫星资料的中国西部地区云垂直结构分析[J].高原气象, 33(4):977-987.
