论文

华北暴雪过程中的急流特征分析

  • 陈雪珍 ,
  • 慕建利 ,
  • 赵桂香 ,
  • 杨东
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  • 山西省运城市气象局, 运城 044000;2. 中国气象局公共气象服务中心, 北京 100081;3. 山西省气象台, 太原 030006

收稿日期: 2013-01-29

  网络出版日期: 2014-08-28

基金资助

山西省气象局重点课题(SXKZDTQ20090505)

Analysis of Jet Stream Characteristic during the Snowstorm Process in North China

  • CHEN Xuezhen ,
  • MU Jianli ,
  • ZHAO Guixiang ,
  • YANG Dong
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  • Yuncheng Meteorology Bureau of Shanxi Province, Yuncheng 044000, China;2. Service Center of Public Meteorology, China Meteorological Administration, Beijing 100081, China;3. Shanxi Meteorological Observation, Taiyuan 030006, China

Received date: 2013-01-29

  Online published: 2014-08-28

摘要

利用常规观测资料和NCEP 1°×1°再分析资料,对2009年11月1011日华北中南部大范围暴雪过程进行了分析。结果表明:(1)这次大暴雪发生在500 hPa高空槽、700 hPa低涡切变线及河套锢囚锋共同配合的天气系统下。(2)暴雪区位于200 hPa极锋急流入口区的右后方和副热带急流出口区的左前方、700 hPa西南急流的左前方、925 hPa和850 hPa偏东急流的右前方。(3)不同高度的急流共同作用形成这次大范围的暴雪天气过程。低空急流是在高空急流的耦合下形成和发展的。容易耦合的区域是在高空急流入口区右侧或在高空急流出口区左侧,正涡度平流随高度增大的区域。(4)西南急流为暴雪区提供充足的水汽并在暴雪区形成高湿区,从而建立和维持了暴雪区上空的对流不稳定层结。(5)西南急流与偏北急流在暴雪区上空形成辐合,在暴雪区上空产生抬升作用。(6)高、低空急流耦合所形成的次级环流,增加了上升运动并触发不稳定能量的释放,增加了暴雪强度和持续时间。(7)925 hPa东风急流在暴雪区的边界层形成了干冷空气垫,有利于偏南暖湿气流的爬升,加强了动力抬升作用。

关键词: 暴雪; 急流; 耦合

本文引用格式

陈雪珍 , 慕建利 , 赵桂香 , 杨东 . 华北暴雪过程中的急流特征分析[J]. 高原气象, 2014 , 33(4) : 1069 -1075 . DOI: 10.7522/j.issn.1000-0534.2013.00205

Abstract

The wide snowstorm in the middle and south of north China on 10-11 November 2009 was analyzed using the NCEP reanalysis data and the general automatic meteorological observing stations data. The results indicate that: (1)The snowstorm occurred in the weather system of upper trough on 500 hPa, low vortex and shear line, and Hetao front occlusion on 700 hPa. (2)The snowstorm located in the right back of the entrance of polar front jet stream and the front left of the subtropical jet stream on 200 hPa, the front left of Southwest jet stream on 700 hPa, and the front right of the easterly jet stream on 925 hPa and 850 hPa. (3)The snowstorm was caused by the jet streams at different altitudes. The low-level jet was formed and developed under the coupling of upper-level jet. The easy-coupling area is where positive vorticity advection is increasing when the altitude increases, in the right of the entrance area of the upper-level jet or the left of the exit area of upper-level jet. (4)Southwest jet stream has provided adequate water vapor for the snowstorm and formed the high-humidity area, which made and maintained the convection instability layer in the snowstorm area. (5)Southwest jet stream and Northerly jet stream formed convergence zone over the snowstorm area, which set up the raising movement of the weather scale for the snowstorm. (6)The secondary circulation caused by the coupling of upper-level and low-level jet increased the raising movement, triggered the release of unstable energy, and increased the intensity and duration of the snowstorm. (7)Easterlies on 925 hPa formed dry and cold mattress in the boundary layer of the snowstorm area, which helped the southerly warm and humid air to climb and strengthen dynamic lifting effect.

Key words: Snowstorm; Jet stream; Coupling

参考文献

[1]朱乾根. 低空急流与暴雨[J]. 气象科技, 1975(8):12-18.
[2]朱乾根, 林锦瑞, 寿绍文, 等. 天气学原理和方法(第四版)[M]. 北京: 气象出版社, 2007: 376-377, 398-399.
[3]韩经纬, 沈建国, 孙永刚, 等. 一次强沙尘暴和暴雪天气过程的诊断及模拟分析[J]. 高原气象, 2007, 26(5):1031-1038.
[4]赵桂香, 杜莉, 范卫东, 等. 一次冷锋倒槽暴风雪过程特征及其成因分析[J]. 高原气象, 2011, 30(6):1516-1525.
[5]蒋后硕, 吕克利. 高、低空急流中的锢囚锋环流[J]. 高原气象, 2000, 19(3):265-276.
[6]徐建芬, 陶健红, 夏建平. 青藏高原切变线暴雪中尺度分析及其涡源研究[J]. 高原气象, 2000, 19(2):187-197.
[7]张迎新, 张守保, 裴玉杰, 等. 2009年11月华北暴雪过程的诊断分析[J]. 高原气象, 2011, 30(5):1204-1212.
[8]王正旺, 姚彩霞, 刘小卫, 等. “2009年. 11”山西大暴雪天气过程诊断分析[J]. 高原气象, 2012, 31(2): 477-486.
[9]裴宇杰, 王福侠, 张迎新, 等. 2009年晚秋河北特大暴雪多普勒雷达特征分析[J]. 高原气象, 2012, 31(4): 1110-1118.
[10]范永祥, 张芬复, 赵同进. 华北春季大雪和黄渤海强东风[J]. 气象, 1979, 15(9):9-10.
[11]Uccellini L W, Johnson D R. The coupling of upper and lower tropospheric jet stream and implication for the development of severe convective storm[J]. Mon Wea Rew, 1979, 107(6): 682-703.
[12]俞樟孝, 李法然, 杨厥正, 等. 一次高空急流中心引起的梅雨锋暴雨分析[J]. 杭州大学学报: 自然科学版, 1981, 1: 104-109.
[13]黄安丽, 高坤. 对流层高、低空急流耦合作用的动力学分析[J]. 浙江大学学报: 理学版, 1982, 9(3): 356-364.
[14]赵亚民. 关于低空急流[J]. 气象, 1979, (6): 24-25.
[15]寿绍文, 励申申, 姚秀萍, 等. 中尺度气象学[M]. 北京:气象出版社, 2003: 235-241.
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