Numerical simulation of airborne cloud seeding over Greece, using a convective cloud model

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• 作者：Vlado Spiridonov (1)
  Theodore Karacostas (2)
  Dimitrios Bampzelis (2)
  Ioannis Pytharoulis (2)
  
  1. Faculty of Natural Sciences and Mathematics ; Institute of Physics ; Ss. Cyril and Methodius University ; Skopje ; R. Macedonia
  2. Departments of Meteorology and Climatology ; Aristotle University of Thessaloniki ; Thessaloniki ; Greece Faculty of Natural
  
• 关键词：Weather modification ; cloud modeling ; cloud seeding ; the Greek National Hail Suppression Program
• 刊名：Asia-Pacific Journal of Atmospheric Sciences
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：51
• 期：1
• 页码：11-27
• 全文大小：4,246 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Meteorology and Climatology
  
• 出版者：Korean Meteorological Society, co-published with Springer
• ISSN：1976-7951

文摘

An extensive work has been done by the Department of Meteorology and Climatology at Aristotle University of Thessaloniki and others using a three-dimensional cloud resolving model to simulate AgI seeding by aircraft of three distinct hailstorm cases occurred over Greece in period 2007-2009. The seeding criterion for silver iodide glaciogenic seeding from air is based on the beneficial competition mechanism. According to thermodynamic analysis and classification proposed by Marwitz (1972a, b, and c) and based on their structural and evolutionary properties we classified them in three groups as singlecell, multicell and supercell hailstorms. The seeding optimization for each selected case is conducted by analysis of the thermodynamic characteristics of the meteorological environment as well as radar reflectivity fields observed by the state of the art Thunderstorm Identification, Tracking, Analysis and Nowcasting (TITAN) software applied in the Greek National Hail Suppression Program (GNHSP). Results of this comprehensive study have shown positive effects with respect to hailfall decrease after successful seeding as our primarily objective. All three cases have illustrated 15-20% decrease in accumulated hailfall at the ground Seeded clouds have exhibited earlier development of precipitation and slight dynamical enhancement of the updraft and rainfall increase of ~10- 12.5%. The results have emphasized a strong interaction between cloud dynamics and microphysics, especially the subgrid scale processes that have impact on agent transport and diffusion in a complex environment. Comparisons between modelled and observed radar reflectivity also show a relatively good agreement. Simulated cloud seeding follows the operational aircraft seeding for hail suppression. The ability of silver-iodide particles to act as ice nuclei has been used to perform airborne cloud seeding, under controlled conditions of temperature and humidity. The seeding effects depend upon applying the seeding methodology in proper seeding time, right placement and agent dose rate.