冷流低云降雪成因的分析

冷流低云降雪是冬季山东半岛北部沿海地区独特的天气现象，为了研究冷流低云降雪的成因，通过对烟台１９８１－１９９０年１１月－次年３月的５０个月农日农时的降雪资料、气温资料及海面温度资料分析和探讨，认为适宜的环流形势、海－气相互作用、低层稳定度、低层风切变及地形的抬升作用是冷流低云形成并产生降雪的主要原因。

An Analysis on the Cause of the Cold Current and Low-level Cloud Snowfall

he cold current and low-level cloud snowfall in winter is a special weather phenomena over the north coastal area of Shandong Peninsula. Fifty months' data of day-to-day and hour-to-hour snowfall, temperature and sea-surface temperature at Yantai Meteorological Station within the period of November and next year's March from 1981 to 1990 is analysed,for studying the cause of the cold current and low-level cloud snowfall. The favourable circulation pattern, sea-air interaction, stability of the low layer, wind shear of the low layer and effect of orographic lifting are the main causes that form the cold current and low-level cloud and caused snow-fall.