黑龙江省富裕县气温日较差变化特征

利用富裕县1961—2016年最高、最低气温资料,采用线性倾向估计法分析了近56年来富裕县气温日较差的年、季、月变化特征,揭示富裕县气温日较差的气候特征和演变规律。结果表明,近56年来富裕县年平均气温日较差为11.9℃,年平均气温日较差总体呈下降趋势,降低幅度为0.542℃/10 a。春季气温日较差最大,夏季最小,季节变化呈高—低—高—低特点;四季平均气温日较差均呈显著的下降趋势,下降幅度从大到小依次为冬季、春季、夏季、秋季。月平均气温日较差最大值出现在5月(13.6℃),最小值出现在7月(10.1℃);各月气温日较差均呈显著下降趋势,1月份下降幅度最大,8月下降幅度最小。月平均最低气温增温幅度远大于最高气温,是导致年、季、月平均气温日较差显著下降的主要原因。

Variation Characteristics of Diurnal Temperature Range of Fuyu County in Heilongjiang Province

Based on the maximum and minimum temperature data in Fuyu County from 1961 to 2016, the annual, seasonal and monthly variation characteristics of the diurnal temperature range in Fuyu County in recent 56 years were analyzed by linear trend estimation method.The climatic characteristics and evolvement rule of the diurnal temperature range in Fuyu County were analyzed.The results showed that the annual average di-urnal temperature range of Fuyu County was 11.9 ℃ in the past 56 years, and the annual average diurnal temperature range was generally a downward trend,and the decrease was 0.542 ℃/10 a.The diurnal temperature range was the largest in summer, and that was least in summer;the seasonal variation was high-low-high-low characteristic.The average diurnal temperature range of the four seasons showed a decreasing trend, and the descending trend was winter, spring, summer and autumn.The monthly average diurnal temperature range was the largest in May (13.6 ℃), the least value appeared in July(10.1 ℃);the monthly diurnal temperature range showed a significant downward trend, the largest decline in January, the least decline in August.The increase rate of the average monthly minimum temperature was much higher than the maxi-mum temperature,which was the main reason for the decrease of the annual, seasonal and monthly average diurnal temperature range.