| 祁连山冬季降雪个例模拟分析(Ⅰ):降雪过程和地形影响 |
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| 引用本文： | 孙晶,楼小凤,胡志晋.祁连山冬季降雪个例模拟分析(Ⅰ):降雪过程和地形影响[J].高原气象,2009,28(3). |
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| 作者姓名： | 孙晶 楼小凤 胡志晋 |
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| 作者单位： | 中国气象科学研究院/中国气象局人工影响天气中心,北京,100081 |
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| 基金项目： | 社会公益研究专项，中国气象科学研究院基本科研业务研究专项，国家自然科学基金项目，"十一五"国家科技支撑项目 |
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| 摘 要： | 利用部分改进了的中尺度数值模式MM5V3对2006年2月7～8日祁连山一次降雪过程进行了三重双向影响嵌套模拟研究,模式对雪带分布的模拟与实测基本吻合.重点分析了此次降雪过程中的热力动力特征和云的微物理结构,并通过地形敏感性试验,研究了祁连山地形对降雪的作用.结果表明:降雪过程中有低层西北湿冷气流向祁连山区输送水汽在山前形成大值区,气流除在祁连山周围绕流外同时沿祁连山北坡爬升.降雪前期空气饱和层和上升气流区比较深厚,为祁连山北坡降雪中心的形成提供了有利的动力热力条件,降雪后期有高空干冷下沉气流侵入使降雪减弱.这次过程为冷性稳定层云降雪过程,水成物含水量大值区也主要分布于祁连山北坡和山顶附近,冰晶和雪分布在6 km以下,在冷云顶存在0.06 g·kg-1的过冷云水.祁连山高大地形对大范围降雪落区无明显影响,但对祁连山北坡降雪中心形成有直接影响.降低地形高度后,山顶无法形成上升运动和云粒子,迎风坡云体发展减弱.地形对降雪增幅中心主要位于祁连山北坡,24 h最大增幅达3 mm.
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| 关 键 词： | 祁连山 地形 降雪 微物理过程 |
Numerical Simulation of Snowfall in Winter of Qilian Mountains. Part (Ⅰ) : Snowfall Process and Orographic Influence |
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| SUN Jing,LOU Xiao-feng,HU Zhi-jin.Numerical Simulation of Snowfall in Winter of Qilian Mountains. Part (Ⅰ) : Snowfall Process and Orographic Influence[J].Plateau Meteorology,2009,28(3). |
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| Authors: | SUN Jing LOU Xiao-feng HU Zhi-jin |
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| Institution: | Chinese Academy of Meteorological Sciences/Weather Modification Center of ChinaMeteorological Administration;Beijing 100081;China |
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| Abstract: | A case of snowfall in Qilian Mountains during 7~8 February 2006 is simulated using the mesoscale model MM5V3.The simulated snow band is basically consistent with observation.The dynamical and thermal conditions and microphysical characteristics of the snowfall are mainly discussed.The orographic influence of Qilian Mountains is also investigated through sensitivity tests.Results show that there is a south-west cold moist flow in front of the mountainin low levels.The flow is separated into two parts,one is ... |
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| Keywords: | Qilian mountains Terrain Snowfall Microphysical process |
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