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气象:2013,39(11):1445-1451
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太行山东麓地面辐合线特征分析
(1.河北省廊坊市气象局,廊坊 065000;2.中国气象科学研究院,北京 100081;3.河北省石家庄市气象局,石家庄 050081;4.河北省气象局,石家庄 050022)
Analysis of Surface Convergence Line Features in the Eastern Side of Taihang Mountain
(1.Langfang Meteorological Office of Hebei, Langfang 065000;2.Chinese Academy of Meteorological Sciences, Beijing 100081;3.Shijiazhuang Meteorological Bureau of Heibei, Shijiazhuang 050081;4.Hebei Meteorological Bureau, Shijiazhuang 050022)
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投稿时间:2012-11-01    修订日期:2013-02-04
中文摘要: 由于太行山地形的影响,在河北中南部,地面存在着几乎定常的风向辐合,局地对流天气往往发生在地面辐合线附近。利用2007和2008年5—9月地面加密风场资料,分析了河北省中南部地面辐合线的逐时演变特征以及与局地对流降水的关系。结果表明,地面辐合线傍晚时分在保定西南部生成以后,沿太行山逐渐扩展,自西向东缓慢推移,强度逐渐加强,早晨前后形成近乎闭合的气旋式环流。依据逐次过程最强降水时次的风场,将地面辐合线分为7类;单纯由地形引发的地面辐合线一般不产生降水,即使造成降水,量级也比较小,也就是说,一般地形导致的辐合不会直接触发对流,只有在有利的天气系统配合下,才会产生较为剧烈的对流天气。通过对2008年7月下旬连续冷涡天气个例逐日的地面辐合线分析表明,无论何种类型的辐合线,对流天气首先出现在辐合线附近;在大尺度的环流背景下,利用逐时风场、温度场的发展演变,可以定性判断对流天气出现的时间、落区,以及强度等。
Abstract:Because of the influence of Taihang Mountain topography, there is steady wind direction convergence in lower layer in the south central region of Hebei Province, and the local convective weather often occurs near the surface convergence line (SCL). Based on the dense surface observational data from May to September in 2007 and 2008, the relation between evolution characteristics of hourly SCL and local convective rainfall is analyzed. The results show that the SCL gradually expands along the Taihang Mountain after it emerges at dusk in the southwest of Baoding, slowly moving from west towards east with intensity steadily strengthened. In the early morning the next day a cyclonic circulation is almost shaped. The SCLs are classified into 7 types according to the wind fields at the hour with strongest rainfall in each process. Generally, the SCL caused simply by topography cannot generate rainfall, and the intensity is small even if rain falls. That is to say, the SCL caused by topography generally does not produce convective weather, but will result in severe convective weather on the advantageous condition of weather system. By analyzing the daily SCL in the cases of a cold eddy weather system in the last ten days of June 2008, it is indicated that the convective weather first appears, near the convergence line no matter what type of SCL is generated. The time, location and intensity of convective weather can be qualitatively determined according to the evolution of hourly wind and temperature fields under the large scale atmospheric circulation.
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基金项目:国家自然科学基金项目(41375038)和公益性行业(气象)科研专项(GYHY200706004)共同资助
引用文本:
王丽荣,刘黎平,王立荣,王宗敏,2013.太行山东麓地面辐合线特征分析[J].气象,39(11):1445-1451.
WANG Lirong,LIU Liping,WANG Lirong,WANG Zongmin,2013.Analysis of Surface Convergence Line Features in the Eastern Side of Taihang Mountain[J].Meteor Mon,39(11):1445-1451.