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- 저자 : Dimitrios Bampzelis (검색결과 1 건)
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Numerical Simulation of Airborne Cloud Seeding over Greece, Using a Convective Cloud Model
Vlado Spiridonov,Theodore Karacostas,Dimitrios Bampzelis,Ioannis Pytharoulis 한국기상학회 2015 Asia-Pacific Journal of Atmospheric Sciences Vol.51 No.1
An extensive work has been done by the Department ofMeteorology and Climatology at Aristotle University of Thessalonikiand others using a three-dimensional cloud resolving model tosimulate AgI seeding by aircraft of three distinct hailstorm casesoccurred over Greece in period 2007-2009. The seeding criterion forsilver iodide glaciogenic seeding from air is based on the beneficialcompetition mechanism. According to thermodynamic analysis andclassification proposed by Marwitz (1972a, b, and c) and based ontheir structural and evolutionary properties we classified them inthree groups as singlecell, multicell and supercell hailstorms. Theseeding optimization for each selected case is conducted by analysisof the thermodynamic characteristics of the meteorological environmentas well as radar reflectivity fields observed by the state of theart Thunderstorm Identification, Tracking, Analysis and Nowcasting(TITAN) software applied in the Greek National Hail SuppressionProgram (GNHSP). Results of this comprehensive study have shownpositive effects with respect to hailfall decrease after successfulseeding as our primarily objective. All three cases have illustrated15-20% decrease in accumulated hailfall at the ground Seededclouds have exhibited earlier development of precipitation and slightdynamical enhancement of the updraft and rainfall increase of ~10-12.5%. The results have emphasized a strong interaction betweencloud dynamics and microphysics, especially the subgrid scaleprocesses that have impact on agent transport and diffusion in acomplex environment. Comparisons between modelled and observedradar reflectivity also show a relatively good agreement. Simulatedcloud seeding follows the operational aircraft seeding for hailsuppression. The ability of silver-iodide particles to act as ice nucleihas been used to perform airborne cloud seeding, under controlledconditions of temperature and humidity. The seeding effects dependupon applying the seeding methodology in proper seeding time, rightplacement and agent dose rate.
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