寿光市近56年气温日较差变化特征分析

为了揭示寿光市气温日较差的演变规律和特征，根据寿光市1959—2014 年逐日最高气温和最低气温资料，利用线性倾向估计、累积距平、Mann-Kendall 和信噪比等方法，对寿光市近56 年的气温日较差变化特征进行统计分析。结果表明：寿光市年平均气温日较差总体呈显著变小趋势，平均每10 年降低0.38℃。寿光市气温日较差的年代际最大值出现在1960s，最小值出现在2000s。四季以春季日较差最大，夏季最小，各季气温日较差均呈显著变小趋势，冬季变化趋势最为显著，夏季变化幅度最小。全年各月气温日较差5 月最大，8 月最小，均呈减小趋势，5 月减小幅度最大。年气温日较差变小的显著突变发生在1998 年，春、夏、秋、冬4 个季气温日较差距平由正转负的转折年分别为1981 年、1988 年、1993 年、1992年。

Daily Range of Temperature: Variation Characteristics in Shouguang in Recent 56 Years

The paper aims to reveal the evolvement rule and characteristics of the daily range of temperature in Shouguang. According to the daily maximum and minimum temperature data in Shouguang from 1959 to 2014, by using methods of linear tendency estimation, cumulative anomaly, Mann-Kendall and noise-signal ratio etc., the variation characteristics of the daily range of temperature in recent 56 years were statistically analyzed. The results showed that: the annual average daily range of temperature in Shouguang significantly decreased by 0.38℃/10 a;the decadal maximum value of daily range of temperature appeared in 1960s, while the minimum value appeared in 2000s;the daily range of temperature in spring was the maximum, while that in summer was the minimum; the daily range of temperature in each season significantly decreased, and the winter had the most significant change, and the variation range of temperature in summer was the minimum;the daily range of temperature was the maximum in May and the minimum in August, the trend was a decreasing one; a significant mutation of the annual daily range of temperature with a decrease occurred in 1998, the anomalies of daily range of temperature of spring, summer, autumn and winter were in 1981, 1988, 1993 and 1992, respectively.