摘要
选取天水市7个气象站1965—2011年日照时数资料,采用累积距平、Mann-Kendall突变检验法和Morlet小波等方法,分析天水市日照时数的气候变化规律。结果表明,天水市年平均日照时数总体呈减少趋势。1965—1980年,日照时数呈增加趋势;1981—1992年呈减少趋势;1993—2008年呈增加趋势;2009年以后又趋于减少。日照时数的变幅最大的季节为夏季,春季的日照时数变化呈上升趋势,其余各季都呈下降趋势。小波分析得出天水市的全年和各季的日照时数大部都存在小尺度的准周期变化,冬季存在中尺度的周期变化,夏季在年代际的变化上存在准27年的周期变化。对日照时数气候变化的空间分析表明,天水市整体平均日照时数呈下降趋势,有局部地方和整体趋于的气候变化趋势不完全相同,天水北部的变化趋势更加显著。
Based on the hour’s data of meteorological stations from 1965-2011, the characteristics of sunshine hours change in Tianshui City had been studied with the methods of accumulative anomalies, Mann-kendall test and wavelet analysis. The result indicated that, the annual average sunshine hours showed a trend of decrease in Tianshui, The annual average sunshine hours increased during 1965-1980 and 1993-2008, and it showed a trend of reduce in, and tends to decrease since 2009. The greatest amplitude season was summer, spring sunshine hours change is on the rise, the rest of the season was on the decline. The wavelet analysis results showed that throughout the year and each season of sunshine hours most had the small scale of quasi cycles in Tianshui, winter there were mesoscale cycles, summer on the interdecadal changes exist quasi cycle changes in 27 years. Spatial distribution of the change rate showed that the trend was general but not universal;the change tendency was more significant in the north of Tianshui.
出处
《农学学报》
2015年第6期82-87,共6页
Journal of Agriculture
基金
甘肃省强对流天气预报预警系统建设项目
公益性行业(气象)科研专项(GYHY201306006)
