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暴雨灾害  2013, Vol. 32 Issue (2): 167-175    DOI: 10.3969/j.issn.1004-9045.2013.02.010
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2011年3月云南连续两次强倒春寒天气过程对比分析
尤红,周泓,白学文,李艳平
(云南省玉溪市气象局,玉溪 653100)
Comparative analysis of continuous two strong coldness processes in late spring in March 2011 in Yunnan
YOU Hong, ZHOU Hong, BAI Xuewen, LI Yanping
(Yuxi Meteorological Office of Yunan Province, Yuxi 653100 )
 全文: PDF (3756 KB)   HTML ( 输出: BibTeX | EndNote (RIS)      背景资料
摘要 利用常规气象观测资料和NCEP 1°×1° 6 h再分析资料,对2011年3月中、下旬云南两次强倒春寒天气过程(分别简称过程Ⅰ和过程Ⅱ)进行对比分析。结果表明,两次过程的影响系统不同,其造成的地面降温原因不同;垂直上升运动的厚度和强度不同,雨雪的强度和范围大小有明显差别。中低层水汽通量的增加和水汽辐合是云南大范围强降雪的必备条件,而降水对水汽通量和水汽辐合强度的要求低于降雪。过程Ⅰ水汽辐合发展高度高于过程Ⅱ,其无论降水还是降雪的强度和范围均超过过程Ⅱ。能量锋区附近不稳定能量水平梯度越大,能量积聚越多,其触发后强烈释放,带来的天气现象也越剧烈。倒春寒发生前,过程Ⅱ云南省的位势不稳定强于过程Ⅰ;倒春寒爆发后,过程Ⅱ的雷暴范围大于过程Ⅰ。低层露点锋抬升作用可触发中层强不稳定能量释放,等露点温度(Td)线分布区域对降雨(雪)及雷暴分布具有一定的指示意义。
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作者相关文章
尤红
周泓
白学文
李艳平
关键词倒春寒   昆明准静止锋   南支槽   川滇切变线   对比分析     
Abstract: Based on conventional observation data and NCEP 6-hourly reanalysis data with resolution 1°×1°, comparative analysis of two strong coldness processes (called process Ⅰ and process Ⅱ for short respectively) in Yunnan in middle and late March of 2011 was made.The results indicate that the reasons for surface temperature decreasing are different in the two processes because of different influence systems, and the intensity and range of the rain and snow are obviously different because of different height and strength of the vertical ascending motion. The increasing of water vapor flux and the vapor convergence in the mid- and low-level are the essential conditions causing the wide-spread snowfall in Yunnan, but the rainfall requires lower intensity of water vapor flux and vapor convergence than snowfall. Intensity and range of both rainfall and snowfall in processⅠexceed ones in processⅡbecause of stretching height of vapor convergence in processⅠwas higher than that in processⅡ. The greater horizontal gradient of instable energy near energy front zone is, the more accumulative energy was,and the more drastic weathers occur after energy released. The potential instability in processⅡis stronger than that in processⅠbefore late spring cold happened and thunderstorm range in Yunnan in processⅡis wider than that in processⅠafter late spring cold occurred. The uplift effect of dew-point front in the low-level can trigger release of strong unstable energy in the middle level, and the distribution areas of isodro-
sotherm have a certainly indicative significance for locations of rainfall, snowfall and thunderstorm.
Key wordscoldness in the late spring   Kunming quasi-stationary front   south branch trough   Sichuan-Yunnan shear line   comparative analysis   
引用本文:   
尤红, 周泓, 白学文,等 .2013. 2011年3月云南连续两次强倒春寒天气过程对比分析[J]. 暴雨灾害, 32(2): 167-175.
YOU Hong, ZHOU Hong, BAI Xuewen, et al .2013. Comparative analysis of continuous two strong coldness processes in late spring in March 2011 in Yunnan[J]. Torrential Rain and Disasters, 32(2): 167-175.
 
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