兩次華北冷渦過程雹云結構特征及AgI催化效果數(shù)值研究

doi:10.3969/2012jms.00**

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兩次華北冷渦過程雹云結構特征及AgI催化效果數(shù)值研究
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                        10.3969/2012jms.00**
                    
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中圖分類號:P437
基金項目:科技部社會公益研究專項資金項目(編號:2001DIB20104)資助

NUMERICAL STUDY ON AgI SEEDING IN HAIL STORMS WITH VARIOUS COLD VORTEX PROCESS IN SHANDONG

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用三維完全彈性非靜力平衡雹云模式模擬了不同低渦雹云演變特征和人工引晶催化效果,結果表明:冷渦雹云中不存在大量的過冷雨滴,過冷水幾乎是由云滴組成的,雹胚形成以云霰轉(zhuǎn)化為主,由冰相過程形成降水粒子。近地面有薄逆溫層云體,云底溫度高,云中垂直運動強,云中過冷云水含量增長迅速且豐富。在雹云主要上升氣流到達的過冷水含量大值區(qū)下方和過冷水大值區(qū)中心部位分別一次引進×107/kg碘化銀粒子進行大劑量催化試驗,碘化銀主要以凝結-凍結方式核化成冰,雹胚濃度增加,雹胚過多爭食抑制冰雹增長,使得冰雹直徑明顯減小。

Abstract:

The result of the numerical simulation of hailstorms in two cold vortex processes by using the three-dimensional elastic nonhydrostatic model showed that there were a lot of super-cooled cloud droplets instead of raindrops. The initiation of natural precipitation elements in the strong convective clouds was related with the ice phase .The hail embryos were formed mainly through conversion of cloud droplet to graupel. In thin ground inversion cloud, the cloud bottom temperature was higher, the vertical convection was stronger, the super-cooled water increased faster and the content was richer. After seeding AgI particles in the cloud in two different ways, ice-forming nuclei was produced in concreting-freezing way under the lower temperature clouds, reduced the super-cooled raindrops and suppressed hailstone growth by accretion, increased the number density of canisters, lighten the disaster of hailstone.

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遲竹萍,劉詩軍.兩次華北冷渦過程雹云結構特征及AgI催化效果數(shù)值研究.氣象科學,2005,(1):61-70 Chi Zhuping, Liu Shijun. NUMERICAL STUDY ON AgI SEEDING IN HAIL STORMS WITH VARIOUS COLD VORTEX PROCESS IN SHANDONG. Journal of the Meteorological Sciences,2005,(1):61-70

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收稿日期:2002-10-22
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