| 2011年2月喀什冬季一次暴雪天气过程分析 |
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| 引用本文： | 杨利鸿,周宏,玛依热.艾海提.2011年2月喀什冬季一次暴雪天气过程分析[J].新疆气象,2015,9(5):69-74. |
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| 作者姓名： | 杨利鸿 周宏 玛依热.艾海提 |
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| 作者单位： | 喀什地区气象台,岳普湖县气象局,喀什地区气象台 |
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| 基金项目： | 中国沙漠气象科学研究基金（ Sqj2012004）、中国气象局预报员专项（CAMYBY2015-087）共同资助。 |
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| 摘 要： | 应用常规观测资料，NCEP1??1?资料，静止卫星FY—2C红外云图和多普勒雷达资料，分析了2011年2月25—28日喀什地区暴雪天气的成因。结果表明: 此次暴雪是在冬季显著变暖的背景，中亚低槽、萨彦岭低涡共同影响下造成的喀什地区范围广、强度大的大降雪过程。中亚低槽先加深、后减弱北收持续影响是喀什长时间降雪的主要原因。海平面气压场上中亚、塔里木盆地存在强的气压梯度，利于暴雪出现。暴雪过程中有明显的低层辐合、高层辐散及低空偏东急流；高空西南气流、底层持久的偏东急流为大降水提供了充足的水汽。多普勒雷达的反射率因子回波图上表现为强的东西入流辐合区，平均径向速度图上也有明显的呈“S” 形零速度线，表明雷达上空风随高度顺转有暖平流存在。
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| 关 键 词： | 暴雪 环流形势 水汽通量 雷达回波 |
| 收稿时间： | 2015/1/29 0:00:00 |
| 修稿时间： | 2015/6/18 0:00:00 |
Analysis of a Heavy Snowstorm Weather Process of Kashi in winter of 2011 |
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| Yang Lihong,Zhouhong and mayireaihaiti.Analysis of a Heavy Snowstorm Weather Process of Kashi in winter of 2011[J].Bimonthly of Xinjiang Meteorology,2015,9(5):69-74. |
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| Authors: | Yang Lihong Zhouhong and mayireaihaiti |
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| Institution: | Kashi District Meteorological Observatory Xingjiang Kashi,The Meteorological Bureau of Yuepuhu County Xingjiang Yuepuhu,Kashi District Meteorological Observatory |
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| Abstract: | Abstract: Applicating the conventional observation data, NCEP1??1?information, geostationary satellite FY-2C infrared imagery and Doppler radar data, analyzes the causes of heavy snow in Kashi Prefecture in February 2011 25-28th.The results showed that:the Blizzard is a wide range and high intensity of large Snowfall Process influenced by significant warming in winter background,central-Asia low trough and Sayan Vortex.The low trough in Central Asia weakened and stopped in north,after deepening.Sustained impact is mainly due to prolonged snowfall in kashi Prefecture.Sea level pressure field in Central Asia and the Tarim Basin there is a strong pressure gradient,which will help Blizzard appears.There are significant low-level convergence,Upper divergence and Low-level easterly jet in the progress of Blizzard.Altitude southwest flow, the underlying persistence easterly jet stream provided sufficient moisture to the heavy rain.In the Doppler radar reflectance factor echocardiogram shows the strong east-west inflow convergence zone,Average radial velocity chart also showed significant S-shaped zero speed line,which presented wind with height clockwise over radar had Warm advection. |
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| Keywords: | Blizzard circulation situation moisture flux radar echo |
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