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Characteristics and Analysis of Air Temperature Variation of Shangqiu Area in Recent 47 Years

XU Feng-mei et al(Shangqiu Weather Bureau,Shangqiu,Henan 476000)  
With monthly mean temperature records of 8 stations in Shangqiu from 1961 to 2007,the variation of air temperature was analyzed by applying methods of linear regression analysis,moving average and accumulated variance analysis.By using methods of slide t-test method,Yamamoto and Mann-Kendall,the abrupt change points of air temperature were detected.The results showed that the variation trend of temperature was 0.078 ℃/10 a in recent 47 years.The warming period was from 1960's to 1970's,while the cold period was 1980's and there was an obviously increasing tendency after the mid 1990s.The average temperature of spring,autumn and winter appeared to be ascending and the winter's amplitude of raised temperature was larger than that in other seasons.The variation of winter temperature was 0.382 ℃/10 a,the spring's was 0.084 ℃/10 a and the autumn's was 0.049 ℃/10 a.The air temperature of summer declined and the variation was-0.169 ℃/10 a.The results of three detected methods indicated that the abrupt change point of four seasons were different and the point of annual mean temperature from cold to warm was the year of 1993 with the credibility being more than 99%.
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