摘要
以地面最低温度低于0℃作为霜冻指标,基于河南省开封市1958-2012年逐日地面最低温度资料,采用线性倾向估计法和累积距平,通过分析初终霜冻日和霜期的变化,研究开封市霜冻期的变化趋势和异常发生情况。结果表明,开封市平均初霜冻日为11月3日,平均终霜冻日为4月3日,平均霜期为152d;开封市特早初霜冻、偏早初霜冻、特晚终霜冻、偏晚终霜冻发生频率分别为5%、5%、5%、10%;55a间开封市霜冻期的变化趋势表现为初霜冻日来得迟,终霜冻日结束早;初霜冻日的线性倾向率为2.62d/10a,终霜冻日的线性倾向率为-2.73d/10a。
Taking the lowest ground temperature below 0 ℃ as the frost index, based on the daily minimum temperature data of Kaifeng city from 1958 to 2012 in Henan province, the changing trend and abnormal occurrence of frost period in Kaifeng city were studied, through the analysis of first and last frost date and the period of change by using the linear trend estimation and accumulative anomaly. The result showed that the average first frost date was November 3rd, the average frost date was April 3rd, while the forst season was about 152 days on averages; The frequency of extremely earliest first frost, earlier first forst, latest end forst and later end frost was separately 5%, 5%, 5% and 10%. In fifty-five years, the date of first frost had already postponed, the final forst date had advanced; The linear rendency rate of first forst date was 2.62 d/10 a, the linear rendency rate of last frost day was -2.73d/10a.
作者
康暑雨
Kang Shuyu(Kaifeng Meteorological Bureau,Kaifeng Henan 475004)
出处
《河南科技》
2017年第3期146-147,共2页
Henan Science and Technology
关键词
霜期
初霜冻日
终霜冻日
气候特征
frost season
first frost event
late frost event
climate characteristics
