Verification of precipitation enhancement by weather modification experiments using radar data

Yonghun Ro
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Abstract

Weather modification research has been actively performed worldwide, but a technology that can more quantitatively prove the research effects are needed. In this study, the seeding effect, the efficiency of precipitation enhancement in weather modification experiment, was verified using the radar data. Also, the effects of seeding material on hydrometeor change was analyzed. For this, radar data, weather conditions, and numerical simulation data for diffusion were applied. First, a method to analyze the seeding effect in three steps was proposed: before seeding, during seeding, and after seeding. The proposed method was applied to three cases of weather modification experiments conducted in Gangwon-do and the West Sea regions. As a result, when there is no natural precipitation, the radar reflectivity detected in the area where precipitation change is expected was determined as the seeding effect. When natural precipitation occurs, the seeding effect was determined by excluding the effect of natural precipitation from the maximum reflectivity detected. For the application results, it was found that the precipitation intensity increased by 0.1 mm/h through the seeding effect. In addition, it was confirmed that ice crystals, supercooled water droplets, and mixed-phase precipitation were distributed in the seeding cloud. The results of these weather modification research can be used to secure water resources as well as for future study of cloud physics.
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利用雷达资料进行人工影响天气试验对增雨效果的验证
人工影响天气的研究已在世界范围内积极开展,但需要一种能够更定量地证明研究效果的技术。本研究利用雷达资料验证了人工影响天气试验中增雨效率的播种效应。此外,还分析了播料对水成物变化的影响。为此,应用了雷达数据、天气条件和扩散的数值模拟数据。首先,提出了分播种前、播种中、播种后三个阶段进行播种效果分析的方法。该方法在江原和西海地区进行了3次人工影响天气试验。因此,在没有自然降水的情况下,将预计降水变化区域探测到的雷达反射率确定为播种效应。当有自然降水时,通过从最大反射率中排除自然降水的影响来确定播种效应。应用结果表明,通过播种效应,降水强度增加了0.1 mm/h。此外,还证实了播种云中存在冰晶、过冷水滴和混合相降水。这些人工影响天气的研究成果可用于保护水资源,也可用于未来云物理的研究。
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