【摘要】 针对2008年1月中下旬运城市出现近50a来罕见的低温大雪冰冻天气过程的环流背景、影响系统、旬平均场等因素进行详细分析,结果表明:高纬度环流经向度大,南支槽活跃,副高偏北、偏强是造成持续低温冰冻的主要原因;而高空回暖、地面回流以及西南急流加强是造成运城强降雪的重要因素。更多还原

【Abstract】 The circulation background,large scale weather system and ten-day averaged flow field, which induce the detail low temperature,heavy snowfall and frost weather occurred rarely in the last 50 years in Yuncheng on the second half of Jan.2008,are investigated in detail.The results present that the lasting low temperature and frost weather were induced dominantly by the stronger meridionality of high latitude circulation,activity southern trough and the stronger northwardmoving subtropical high pressure.While the return-warm high-level,circumfluence in surface and enhanced southwest jet were main factors to bring heavy snowfall in Yuncheng.更多还原