【摘要】 利用甘肃省27个测站,近46a年历年夏季(6-8月)平均地面月气温资料,采用EOF、REOF、子波分析、Mann-Kendal突变检验法等方法,分析了气温的空间分布特征、时间变化特点并对平均气温时间序列可能的突变点分别进行了检测。结果表明:1)甘肃省夏季平均气温异常的全区一致性是主要特点,也存在河东、河西气温异常的差异。REOF分析把气温异常细分为河西走廊区、陇东南区、陇中区和甘南高原区4个分区。2)各分区在过去的46年中都表现出增温趋势,但气温发生转折和增温突变的时间存在区域性差异,甘南高原转暖和发生变暖突变的时间比其它区域都要提前。3)甘肃省不同区域的夏季气温变化有各自不同的周期性变化,且周期性不很稳定,自2005年以后各区域无论在大、小尺度上均还处在偏暖的周期。更多还原

【Abstract】 Using the summer ( June-August) mean surface air temperature data over the recent 46 years of 27 stations in Gansu Province and the methods of EOF ,REOF,Wavelet analysis and Mann-Kendall,the characteristics of spatial distribution and temporal evolvement for temperature abnormality in Gansu Province are analyzed. The main findings are as follows: ( 1) the abnormity of summer temperature change in Gansu Province is consentaneous,but there is the difference of the abnormity between Hexi and Hedong area. Using the REOF method,we detailedly divide the summer mean air temperature anomaly distribution in Gansu Province into 4 subareas: Hexi Corridor area,southeastern area,central area and southern plateau area. ( 2) The variations of summer mean temperature have a distinctly warming trend in every area,but the time of transition and abrupt change in the southern plateau area was ahead of the other areas. ( 3) There are different periodicities of summer air temperature change in different areas,but the periods are variable . Every area has been in the warmer cycle for both large and small time scale since 2005.更多还原