南阳市近50年四季变化特征分析

Analysis on the Characteristics of Changes in four Seasons in Nanyang City in the Past 50 Years

【目的】研究南阳市四季变化的趋势与规律。【方法】使用物候学来进行四季划分,同时采用线性回归方程计算气候倾向率来定量描述四季变化趋势。【结果】近50年南阳入春、夏、秋、冬的平均日期分别是3月25日、5月19日、9月10日、11月13日,春、夏季提前,秋、冬季推迟。近50年南阳春夏秋冬四季的平均长度分别为62天、118天、63天、123天,春秋长度短,夏冬长度长。【结论】近50年来南阳春季、夏季开始时间呈现提前的趋势,南阳秋季、冬季开始时间呈现延迟的趋势;南阳春季、夏季持续时间呈现缓慢增长的趋势,南阳秋季、冬季持续时间呈现缓慢减少的趋势。

[Purposes]To study the trend and law of seasonal changes in Nanyang City.[Methods]In this paper,phenology is used to divide the four seasons,and linear regression equation is used to calculate the climate tendency rate to quantitatively describe the change trend of the four seasons.[Findings]The average dates of being into spring,summer,autumn and winter in Nanyang in the past 50 years are March 25,May 19,September 10 and November 13,respectively.Spring and summer are advanced,while autumn and winter are delayed.The average length of spring,summer,autumn and winter in Nanyang in the past 50 years is 62 days,118 days,63 days and 123 days respectively.The length of spring and autumn is short,and the length of summer and winter is long.[Conclusions]It is concluded that the start time of spring and summer in Nanyang has shown a trend of advance in the past 50 years,and the start time of autumn and winter in Nanyang has shown a trend of delay;The duration of spring and summer in Nanyang shows a slow growth trend,while the duration of autumn and winter in Nanyang shows a slow decrease trend.