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一、光温水年代间的演变势态 1.日照。60、70、80年代平均日照时数呈明显的梯级下降势态。80年代平均比前20年平均少150小时。 2.气温。三个年代的年平均气温分别为16.9℃、16.4℃、16.2℃,年代间呈梯级下降状态。其中7、8、9、12、3、4月份下降最明显;冬季(12月至次年2月)结冰天数80年代多3天,雪日多7天;夏季(7—9月)各月极端最高气温平均值,80年代比前20年低1.4
First, the evolution of light and warm water between the trend of 1 sunshine. The average sunshine hours in the 1960s, 1970s and 1980s showed a clear downward trend. In the 1980s, on average, 150 hours less than the previous two decades. Temperature The average annual temperatures of the three years were 16.9 ℃, 16.4 ℃ and 16.2 ℃, respectively, showing a cascade decline during the period. Among them, the decline was most obvious in July, August, September, December, March and April; the number of icing days in winter (December to February) was more than three days in the 1980s, The average monthly extreme maximum temperature was lower by 1.4 in the 1980s than in the previous 20 years