Physical effect of cloud seeding revealed by NOAA satellite imagery  

作　　者：YUXing DAIJin LEIHengchi XUXiaohong FANPeng CHENZhengqi DUANChanghui WANGYong 

机构地区：[1]MeteorologicalInstituteofShaanxiProvince,Xi'an710015,China [2]InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029,China [3]CenterofWeatherModificationofShaanxiProvince,Xi'an710015,China [4]MeteorologicalBureauofXianyang,Xianyang712000,China

出　　处：《Chinese Science Bulletin》2005年第1期44-51,共8页

基　　金：the Project of the Ministry of Science and Technology of China(Grant No.2001BA-901A41); the National Natural Science Foundation of China(Grant No.40175003).

摘　　要：From 0615 to 0749 UTC, 14 March 2000, a precipitation enhancement operation with AgI using an air- craft was conducted at the middle part of Shaanxi Province, China. 80 min after cloud seeding (0735 UTC), NOAA-14 satellite data showed a vivid zigzag cloud track on the satel- lite image. Its length is 301 km, and its average and maxi- mum width are 8.3 and 11 km. The cloud track is very simi- lar in shape with, but different in position and width from that of cloud seeding line. In order to determine that the cloud track is indeed caused by cloud seeding, a three-dimensional numerical model of transport and diffu- sion of seeding material is used to simulate the shape of seeding material concentration distribution, the turning points, width and length of seeding line. The simulated re- sults are compared with the features of cloud track at 0735 UTC. Every segment of the cloud track is consistent with the transport and diffusion of every segment of seeding line. The transport position, length, width and the variation trend of seeding line agree with those of cloud track. All suggest that the cloud track is the direct physical reflection of cloud seed- ing effect on the cloud top, which can respond to the trans- port and diffusion of seeding material. For this study case, the main effecting duration for every segment of seeding line is from 20 to 80 min, the time for each segment of seeding line diffusing to the maximum width is from about 50 to 70 min. This time is obtained from the appearing and disap- pearing time, width variation of the cloud track segments and simulated results. Also, the comparisons demonstrate that the numerical model of transport and diffusion can simulate the main characteristics of transport and diffusion of seeding material, and the simulating results are sound and trustworthy.From 0615 to 0749 UTC, 14 March 2000, a precipitation enhancement operationwith Agl using an aircraft was conducted at the middle part of Shaanxi Province, China. 80 min aftercloud seeding (0735 UTC), NOAA-14 satellite data showed a vivid zigzag cloud track on the satelliteimage. Its length is 301 km, and its average and maximum width are 8.3 and 11 km. The cloud trackis very similar in shape with, but different in position and width from that of cloud seeding line.In order to determine that the cloud track is indeed caused by cloud seeding, a three-dimensionalnumerical model of transport and diffusion of seeding material is used to simulate the shape ofseeding material concentration distribution, the turning points, width and length of seeding line.The simulated results are compared with the features of cloud track at 0735 UTC. Every segment ofthe cloud track is consistent with the transport and diffusion of every segment of seeding line. Thetransport position, length, width and the variation trend of seeding line agree with those of cloudtrack. All suggest that the cloud track is the direct physical reflection of cloud seeding effectOE the cloud top, which can respond to the transport and diffusion of seeding material. For thisstudy case, the main effecting duration for every segment of seeding line is from 20 to 80 min, thetime for each segment of seeding line diffusing to the maximum width is from about 50 to 70 min.This time is obtained from the appearing and disappearing time, width variation of the cloud tracksegments and simulated results. Also, the comparisons demonstrate that the numerical model oftransport and diffusion can simulate the main characteristics of transport and diffusion of seedingmaterial, and the simulating results are sound and trustworthy.

关 键 词：物理效应 人工降雨 NOAA 人造卫星 云迹 数字模拟 

分 类 号：P481[天文地球—大气科学及气象学]