太行山迎風(fēng)坡降水云微物理結(jié)構(gòu)數(shù)值模擬分析

doi:10.3969/2012jms.00**

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太行山迎風(fēng)坡降水云微物理結(jié)構(gòu)數(shù)值模擬分析
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                        10.3969/2012jms.00**
                    
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基金項(xiàng)目:公益性行業(yè)科研專項(xiàng)（GYHY200706042）；中國(guó)氣象局預(yù)報(bào)員專項(xiàng)（CMATG2006Y07）

Numerical simulation and analysis of cloud microphysics structure of windward slope rainfall in Taihang Mountain

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摘要:

利用MM5模式對(duì)太行山迎風(fēng)坡暴雨過(guò)程進(jìn)行了數(shù)值模擬，分析了太行山迎風(fēng)坡降水的微物理結(jié)構(gòu)特征及山脈對(duì)降水的影響。結(jié)果表明，降水過(guò)程既有太行山地形作用造成的暖云降水又包含汽、水、冰混合的冷云降水，當(dāng)冰相粒子與液態(tài)水的中心上下接近垂直時(shí)，1 h降水量最大；地形對(duì)于降水增幅作用較大，低層?xùn)|風(fēng)遇太行山阻擋輻合抬升形成地形雨；地形造成的弱垂直運(yùn)動(dòng)將影響高層上升強(qiáng)度，進(jìn)而改變水汽分布，并通過(guò)微物理過(guò)程使得水汽發(fā)生相變，該個(gè)例中垂直上升運(yùn)動(dòng)使得雪和霰相粒子迅速增長(zhǎng)，從而導(dǎo)致雨滴增大并克服重力作用下降，在下落過(guò)程中捕獲低層地形云中水滴變成更大雨滴降落；而在上升過(guò)程中水汽凝結(jié)釋放潛熱，對(duì)物理量場(chǎng)有一個(gè)反饋?zhàn)饔谩?/p>

Abstract:

The numerical simulations using MM5 model are conducted for a heavy rainstorm event in occurred on September 20, 2005 in Hebei province. Based on the model output, the microphysics structure of windward slope rainfall in Taihang Mountain and the impacts of Taihang Mountain on rainfall are analyzed. The results show that the whole rainfall process includes warm cloud rainfall caused by Taihang Mountain as well as cold cloud rainfall in which ice phase is mixed up with liquid phase and vapour phase. The one hour rainfall will be more obvious when the ice phase and the liquid phase centers are vertically distributed. The terrain can induce more topographic heavy rainfall and favors convergence and upward on upwind direction of the Taihang Mountain that affect the intensity of upward current at the higher levels which change the water vapor distribution and phase. In this case, the raindrops grow up and descent due to overcoming the gravity as the snow and graupel increase rapidly with the upward, which become bigger by capturing smaller water drop in the orographic cloud. The latent heat releases by vapor condensation and freezing during ascending motion has a feedback to the physical field.

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侯瑞欽,景華,陳小雷,裴宇杰.太行山迎風(fēng)坡降水云微物理結(jié)構(gòu)數(shù)值模擬分析.氣象科學(xué),2010,(3):351-357 Hou Ruiqin, Jing Hua, Chen Xiaolei, Pei Yujie. Numerical simulation and analysis of cloud microphysics structure of windward slope rainfall in Taihang Mountain. Journal of the Meteorological Sciences,2010,(3):351-357

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收稿日期:2009-01-15
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在線發(fā)布日期: 2012-07-05
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