潍坊市暖冬气候分析

利用潍坊市丘陵、平原、沿海三种下垫面地区自有气象记录以来冬季（12-2月）平均气温、平均最高气温、平均最低气温等资料，对潍坊市不同下垫面地区近50年的冬季气温变化特征作了较全面的分析，结果表明：20世纪50-60年代为偏冷期，70-80年代为振荡期，90年代以来为偏暖期；冬季和冬季各月气温有增温趋势，特别是平均最低气温升高最显著；统计潍坊市的冷、暖冬年，发现：潍坊市暖冬年冬季海平面气压为负距平，东亚500hPa位势高度为正距平，西太平洋海温为正距平。

Analysis of Clamatic Characteristics of Warm Winter in Weifang City

By using the daily average temperature, daily average maximum temperature ano daily average minimum temperature in three kinds of areas in Weifang in winter, the temperature of winter change during last 48 years in Weifang has been fully analysed. The result show that the daily average temperature, daily average maximum temperature and daily average minimum temperature have a trend of ascending as a whole, and average daily minimal temperature is obvious especially. During 1950s-1960s the temperature is lower relatively, most of them are cool winters; during 1970s-1980s the average temperature has some obvious concussion, cool winter and warm winter occur by turns;the average temperature is higher since 1990s, there are 11 warm winters , which hold 68% of the warm winters. The sea level pressure in the east areas of China has negative anomaly, while the potential height of 500hPa and the SST of northwest Pacific has positive anomaly.