气候变暖背景下内蒙古大兴安岭生态功能区冷暖急转气候特征

Climatic feature of temperature sharp turn in the Greater Khingan Range ecological function areas in Inner Mongolia,on the background of climate warming

1961-2015年内蒙古大兴安岭生态功能区气候变暖趋势明显,其气温突变年份为1987年。在气候变暖的背景下,生态功能区的严寒和寒冷日数在突变前呈减少趋势、在突变后呈增加趋势,表明突变后冬季冷天日数并没有明显减少趋势;炎热和温暖日数在突变后呈极显著增加趋势,而暖天日数突变前后变化较为平缓。综合来看,在气候变暖的背景下气温突变后高温日数增加要显著多于低温日数增加。过渡期日数变化趋势特征表明,严寒炎热过渡期、寒冷温暖过渡期和冷暖过渡期在突变后明显变短,生态功能区冷暖急转现象尤为明显。在历年尺度上,冷暖过渡期日数变化随着温度范围的扩大而减少幅度在加大。

The climate warming trend in the Greater Khingan Range ecological function areas in Inner Mongolia was obvious in 1961-2015,which temperature mutation year was 1987. On the background of climate warming,the severe cold and cold days in the study area showed a decreasing trend before the temperature mutation,and the tendency to increase after mutation,which indicated that no significant decrease in the number of cold days after the temperature mutation. The annual severe warm and warm days increased significantly after the temperature mutation,and slight warm days changed gently in fifty-five years. The cold and warm temperature limit and the trend of the transition period indicate that the number of days of high temperature increased significantly higher than the number of days of low temperature increased after the temperature mutation. The transition periods between severe warm and severe cold,warm and cold,and slight warm and slight cold days were significantly shorter. The phenomenon of temperature sharp turn in the area after the temperature mutation was particularly obvious. The change of the number of days of warm and cold transition period over the years increased with the expansion of temperature range.