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| 应用GPS可降水量分析河北省一次回流降雪天气 | |
| 引用本文： | 李国翠,张迎新,李国平,赵卫亮.应用GPS可降水量分析河北省一次回流降雪天气[J].气象科技,2012,40(6):990-995. |
| 作者姓名： | 李国翠 张迎新 李国平 赵卫亮 |
| 作者单位： | 1. 石家庄市气象局,石家庄,050081 2. 河北省气象台,石家庄,050021 3. 成都信息工程学院大气科学学院,成都,610225 |
| 基金项目： | 国家科技支撑项目，行业专项，国家自然科学基金项目，中国气象局西南区域气象中心区域重大科研业务项目 |
| 摘 要： | 利用地基GPS反演的可降水量资料、地面加密自动站和常规天气资料,对2011年2月发生在河北省的一次回流降雪天气过程进行了分析.结果表明:①降雪过程前期,GPS可降水量由西南向东北逐渐增大,后期自北向南减小,与西南暖湿气流的输送和地面冷高压的南压对应.②第1阶段降雪的主要影响系统为高空槽,GPS可降水量不断增加,对应的实际降水也是先增后减；第2阶段的降雪主要表现为回流降雪,降雪前期GPS可降水量迅速增长,实际降水出现在GPS可降水量峰值及下降阶段.随着地面冷高压逐渐南压,GPS可降水量逐渐下降,实际降水也逐渐减弱至停止.③在探空层结曲线上,高湿层位于地面附近和700 hPa附近,而二者之间的近地层存在着低湿层. |
| 关 键 词： | GPS可降水量 回流降雪 探空层结 |
| 收稿时间： | 2011/6/22 0:00:00 |
| 修稿时间： | 2011/11/11 0:00:00 |
Analysis of a Return Flow Snowfall in Hebei Province Using GPS Precipitable Water Vapor |
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| Li Guocui,Zhang Yingxin,Li Guoping and Zhao Weiliang.Analysis of a Return Flow Snowfall in Hebei Province Using GPS Precipitable Water Vapor[J].Meteorological Science and Technology,2012,40(6):990-995. | |
| Authors: | Li Guocui Zhang Yingxin Li Guoping and Zhao Weiliang |
| Abstract: | Based on the precipitable water vapor received from the ground based GPS and ground automatic stations, as well as weather data, a return flow snowfall in Hebei province is studied. The results show that: (1)GPS precipitable water vapor increased from southwest to northeast before the snow, corresponding to the warm and humid southwesterly flow, and decreased from north to south after the snow because of the clod high. (2) The main effect system was the high level trough in the first stage; GPS precipitable water vapor showed increasing trend, and the actual precipitation increased first and reduced then; the main effect system was the return flow in the second stage, and the actual precipitation occurred at the peak of GPS precipitable water vapor or during the decreasing phase. When the cold high moved from north to south, GPS precipitable water vapor decreased, and the actual precipitation weakened and stopped. (3) In the sounding stratification of the return flow snowfall, the high humidity layers were near the ground and the 700 hPa layer, and the low humidity layer was between the high humidity levels. |
| Keywords: | GPS precipitable water vapor return flow snowfall sounding stratification |
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