| 祁连山区夏季降水过程天气分析 |
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| 引用本文： | 陈乾,陈添宇,肖宏斌.祁连山区夏季降水过程天气分析[J].气象科技,2010,38(1):26-31. |
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| 作者姓名： | 陈乾 陈添宇 肖宏斌 |
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| 作者单位： | 1. 甘肃省人工影响天气办公室,兰州,730020
2. 青海省气象科学研究所,西宁,810001 |
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| 基金项目： | 国家自然基金重点项目"西北地形云结构及降水机理研究" |
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| 摘 要： | 以500hPa盛行气流为主,参考FY-2D卫星云图云型特征,将2007年7～8月祁连山区的31次降水过程作天气分型。取30°～45°N范围500hPa110°E的格点平均位势高度与90°E平均位势高度之差值为分类标准。分成3个主型,西南气流型、西北气流型和平直西风气流型。西南气流型又分移动型和阻塞型两个副型。西北气流型分西北气流冷平流型和河套冷涡两个副型。用试验区中尺度自动站网的降水资料,探讨降水量与海拔高度和坡向的关系,分析产生降水过程各天气类型的环流特征及其降水强度,发现在不同的大尺度流型下,地形的动力和热力作用会造成迥然不同的地形强迫中尺度系统。
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| 关 键 词： | 祁连山区 夏季降水 大尺度天气类型 |
| 收稿时间： | 2008/6/17 0:00:00 |
| 修稿时间： | 2009/11/5 0:00:00 |
Synoptic Analysis of Summer Precipitation over Qilian Mountains |
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| Chen Qian,Chen Tianyu and Xiao Hongbin.Synoptic Analysis of Summer Precipitation over Qilian Mountains[J].Meteorological Science and Technology,2010,38(1):26-31. |
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| Authors: | Chen Qian Chen Tianyu and Xiao Hongbin |
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| Institution: | Chen Qian1 Chen Tianyu1 Xiao Hongbin2(1 Gansu Weather Modification Office,Lanzhou 730020,2 Qinghai Research Institute of Meteorology,Xining 81000) |
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| Abstract: | A total of 31 precipitation cases in July and August 2007 over the Qilian Mountains are classified on the basis of the dominant air currents at 500 hPa and the cloud pattern of FY-2D satellite images,taking the difference between 110°E and 90°E of the mean 500 hPa geopotential height of the grid points in 30° to 45°N as the classification standard.The precipitation cases can be classified as three main patterns：southwest current,northwest current,and flat west current.The southwest current pattern is divided into two subtypes：moving and blocking; the northwest current：cold advection and Hetao cold vortex.On the basis of data of the mesoscale automatic weather station network over the experimental region,the relation of precipitation with altitude and slope direction is discussed.The circulation characteristics and precipitation intensity of each circulation pattern that generated precipitation are analyzed. It is found that different large-scale circulation patterns will result in different topographically forced mesoscale systems due to topographic dynamic and thermodynamic effects. |
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| Keywords: | Qilian Mountains summer precipitation large-scale circulation pattern |
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