摘要
In this study,substantial satellitic remote sensing data and atmospheric observational data were used to study a snowfall caused by Bohai sea-effect snow cloud which occurred in Shandong Peninsula from 4 to 6,DEC 2008.The study results show that the snow cloud emerged in the strong northwesterly cold flow in the middle-lower troposphere,the southwest of northeast cold vortex,and cyclonic bending on the surface pressure-field.Although the snowstorm cloud was shallow convective,its cold center was quite strong,the average snowfall rate was 0.41 mm/h during the exuberant period,and the snowfall rate was distributed in strip.The upwelling longwave fluxes on the cloud top were not only related to the temperature,but also related to the ice water content of the cloud,when we study the clouds effect on the radiation,we should consider the rainfall(snowfall)strength of the cloud.
利用大量卫星遥感资料和大气观测资料,对2008年12月4—6日发生在山东半岛北部的一次海效应暴雪云团降雪过程进行了分析,结果表明:暴雪云团发生在东北冷涡西南部对流层中低层强西北冷平流、地面气压场气旋式弯曲的天气背景下;降雪云团虽然为浅对流云,但云系冷中心较强;云团发展旺盛时期的云内平均降雪率为0.41 mm/h,且降雪率的大值区表现为强弱相间的条状分布。云团的射出长波辐射通量不仅与云团温度有关,还与云内冰水含量有关,冰水含量越高,射出长波辐射通量越低。在研究云对辐射的影响时,应分别考虑云的降雨(降雪)强度。
