| 山东半岛冷流暴雪雷达回波特征 |
| |
| 引用本文： | 刁秀广,孙殿光,符长静,苏添记.山东半岛冷流暴雪雷达回波特征[J].气象,2011,37(6):677-686. |
| |
| 作者姓名： | 刁秀广 孙殿光 符长静 苏添记 |
| |
| 作者单位： | 1. 山东省气象台,济南,250031
2. 烟台市气象局,烟台,264001 |
| |
| 基金项目： | 山东省科技厅科技攻关项目（2010GSF10805、2007GG20008001和2009GG10008001）和山东省气象局开放式基金课题（2008sdqxjj01）共同资助 |
| |
| 摘 要： | 利用烟台多普勒雷达资料，结合天气形势，对2005年12月3-7日和2008年12月3-6日山东半岛北部的冷流暴雪过程进行了分析研究。结果表明：东北冷涡造成强冷空气频繁，在对流层低层山东半岛存在强冷平流，海面温度和低层大气温度的较大温差造成了低层大气不稳定；渤海和黄海北部海区为降水提供了丰富的水汽；冷流暴雪产生在对流层低...
|
| 关 键 词： | 冷流暴雪 海岸锋 雷达回波特征 |
| 收稿时间： | 2010/6/22 0:00:00 |
| 修稿时间： | 2010/12/19 0:00:00 |
Doppler Radar Echo Features of Cold Airflow Snowstorms in Shandong Peninsula |
| |
| DIAO Xiuguang,SUN Dianguang,FU Changjing and SU Tianji.Doppler Radar Echo Features of Cold Airflow Snowstorms in Shandong Peninsula[J].Meteorological Monthly,2011,37(6):677-686. |
| |
| Authors: | DIAO Xiuguang SUN Dianguang FU Changjing and SU Tianji |
| |
| Abstract: | Several cold airflow snowstorms emerging in northern coast of Shandong Peninsula from 3 to 7 December 2005 and from 4 to 6 December 2008 were analyzed with Doppler radar data from Yantai and conventional observational data. The results show that the northeast cold vortex in mid troposphere influenced the Shandong Peninsula before and during the snowfall, respectively. Frequently strong cold air in the lower troposphere causes a great air sea temperature difference which is the main reason to induce thermal instability of atmosphere. The water vapor was transported to the snowfall area from the Bohai Sea and northern Huanghai Sea in the lower troposphere and boundary layer. Snowstorms occurred in updraft area with convergence in low troposphere and divergence in mid troposphere. Updraft layer is much more lower than summer heavy rain. The forming and maintaining of mesoscale coastal front along coast line of northern Shandong Peninsula played an important role in the genesis of snowstorms. Echo top and strong echo (above 30 dBz) height have good corresponding relationship with the low level divergence, 0-2 km wind shear and air sea temperature difference. The strong convergence at 850 and 925 hPa, high 0-2 km shear and large low level temperature difference were conducive to echo development. Doppler radar products show that the initial echo generated in southern Bohai Strait and the heavy snow band extended from Bohai Strait toward Shandong Peninsula, the composite reflectivity was about 25 to 35 dBz, echo top was about 3 km. In the velocity field, the coastal front along coast line of northern Shandong Peninsula was very obvious during the heavy snowfall. The swing of coastal front determines the heavy snowfall region which would be in the middle part of northern coast of Shandong Peninsula when the coastal front closes to the coast line, and would be in the east of northern coast of Shandong Peninsula when the coastal front is distant from the coast line. |
| |
| Keywords: | cold airflow snowstorms coastal front radar echo features |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《气象》浏览原始摘要信息 |
| 点击此处可从《气象》下载免费的PDF全文 |
|
