近45a山西冬季0cm地温时空分布及气候分区

利用1965—2009年山西省59个气象站冬季逐月0 cm地温资料,应用多种统计方法,对近45 a山西冬季0 cm地温时空分布及其次区域特征进行研究。结果表明:(1)近45 a来,山西区域冬季平均0 cm地温为显著升温趋势,升温幅度达0.52℃/10 a;从其年代际变化看,20世纪60年代中期到70年代初略呈下降趋势,70年代中期以后呈现明显上升趋势,并在1993年发生突变,进入温度偏高期。从各站点看,全省大部分地区冬季0 cm地温升温趋势显著。(2)山西冬季0 cm地温的空间分布主要表现为全省一致偏高或偏低,其次是北部和南部盆地偏高、南部山区偏低或相反的分布。(3)山西冬季0 cm地温可分为北部、西南部、东南部3个气候区;近45 a来,各区均为显著升温趋势,东南部、西南部、北部分别在1989,1993,1994年发生突变,突变后各区进入0 cm地温偏高期。

The Temporal and Spatial Distribution and Climatic Partition of the Winter Ground Temperature at 0 cm in Recent 45 Years in Shanxi

Using the data of 59 meteorological stations＇ monthly mean temperatures of 0 cm in winter from 1965 to 2009 in Shanxi, and several statistical methods, the temporal and spatial distribution and sub-regional characteristics of the winter ground temperature at 0 cm in recent 45 years in Shanxi were studied. The results showed： （ 1 ） In recent 45 years, the winter 0 cm showed a significant temperature rising in Shanxi region with a heating rate of 0.52℃/10 a. It had a light downward trend from the mid-1960s to the beginning of 1970s and a rising trend from the mid-1970s to present. It has entered a higher temperature period after an abrupt change occurred in 1993. The winter 0 cm temperatures showed a significant rising in the most of 59 stations in Shanxi. （2） The spatial distribution of the winter 0 cm meanly showed a higher temperature or lower temperature uniformly in the most years. Sometimes it had higher 0 cm temperatures in the north part and the southern basin region and lower 0 cm temperature in the southern mountain region, and sometimes an opposite distribution. （3） It could be classified into 3 climatic, regions： the north part, the SW part and the SE part for the winter 0 cm. The three parts all showed significant temperature rising in recent 45 years. The abrupt changes occurred in 1989, 1993, 1994 respectively for the SE, SW, north parts, after then the winter 0 cm temperatures of these three parts entered a higher periods.