[Objective] Characteristics of Doppler radar data of the largest snow process since winter in Chengde City on February 26,2011 were discussed.[Method] By dint of reflection rate factors,radial velocity,and VWP product...[Objective] Characteristics of Doppler radar data of the largest snow process since winter in Chengde City on February 26,2011 were discussed.[Method] By dint of reflection rate factors,radial velocity,and VWP product of Doppler radar in C wave in Chengde of Hebei Province,and coupled with large scale of circulation situation,the largest snow process since the winter in Chengde City on February 26,2011 was discussed.[Result] The echo intensity of snow was weak.If there was certain range of 30 dBz echo and was stable,there might be strong snow.The warm advection,convection and warm and wet air climbing over the thin cold cushion in the lower layer was the main reason of the precipitation.The structure of 'cattle eye' and the torrent in the lower air provided incessant water vapor for the generation of strong precipitation.When the wind in the vertical direction changed,there was wind speed divergence,which indicated that the precipitation weakened and stopped.The existence of warm advection and shear layer was the essential reason for the maintenance of precipitation.The 'ND' area in the middle layer and the northwest wind at any height indicated the end of precipitation.[Conclusion] The study provided theoretical basis for the forecast of strong snow.展开更多
基金Supported by National Science and Technology Support Program Subject (2008BAC37B01)Science and Technology Program of He-bei Meteorological Bureau (10ky03)
文摘[Objective] Characteristics of Doppler radar data of the largest snow process since winter in Chengde City on February 26,2011 were discussed.[Method] By dint of reflection rate factors,radial velocity,and VWP product of Doppler radar in C wave in Chengde of Hebei Province,and coupled with large scale of circulation situation,the largest snow process since the winter in Chengde City on February 26,2011 was discussed.[Result] The echo intensity of snow was weak.If there was certain range of 30 dBz echo and was stable,there might be strong snow.The warm advection,convection and warm and wet air climbing over the thin cold cushion in the lower layer was the main reason of the precipitation.The structure of 'cattle eye' and the torrent in the lower air provided incessant water vapor for the generation of strong precipitation.When the wind in the vertical direction changed,there was wind speed divergence,which indicated that the precipitation weakened and stopped.The existence of warm advection and shear layer was the essential reason for the maintenance of precipitation.The 'ND' area in the middle layer and the northwest wind at any height indicated the end of precipitation.[Conclusion] The study provided theoretical basis for the forecast of strong snow.
