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