摘要
利用牡丹江多普勒天气雷达观测资料对2007年3月4—5日黑龙江省东部地区一次罕见特大暴风雪的雷达回波动力结构特征进行分析。结果表明:高低空急流、风切变、冷暖平流在特大暴风雪过程中特征明显;偏南气流和冷性的东北气流构成的中尺度辐合切变线和西南急流的位置变化对降雪天气的演变过程有重要指示意义;雷达回波反射率因子在15～27dBZ之间,回波面积广,顶高在6km左右,冷暖平流明显,径向速度大,出现"牛眼"、速度模糊等现象,可作为暴风雪临近预报的着眼点。
An exceptional heavy snowstorm occurred in the eastern part of Heilongjiang Province on 4—5 March 2007.The dynamical structure features are analyzed using the Doppler weather radar data in Mudanjiang.The result shows that the upper-lower jet streams,wind shear and cold-warm advection are characteristic during the process of snowstorm.The mesoscale convergence shear line and the position-change of southwest jet streams are caused by the warm south airflow and the cold northeast air current,which have important indicative significances in the process of snowstorm evolution.The radar reflectivity factor is between 15 and 27 dBZ,and the echo area is wide with the echo top of about 6 km.The cold-warm advection is obvious and the radial velocity is large.The phenomena of bull’s eye squall and velocity ambiguity can be a starting point in forecasting of this kind of snowstorm
出处
《大气科学学报》
CSCD
北大核心
2011年第3期329-335,共7页
Transactions of Atmospheric Sciences
基金
黑龙江省气象局"短时临近预报创新团队"项目
关键词
多普勒天气雷达
特大暴风雪
径向速度
速度方位显示
动力结构特征
Doppler weather radar
heavy snowstorm
radial velocity
velocity azimuth display
dynamical structure feature
