School of Environment, Northeast Normal University, Changchun 130024, China; Key Laboratory for Vegetation Ecology, Ministry of Education, Changchun 130024, China; College of Geography, Inner Mongolia Normal University, Hohhot 010022, China.
School of Environment, Northeast Normal University, Changchun 130024, China.
Sci Total Environ. 2019 Feb 1;649:75-89. doi: 10.1016/j.scitotenv.2018.08.262. Epub 2018 Aug 21.
Due to global warming, extreme climate events have become an important issue, and different geographical regions have different sensitivities to climate change. Therefore, temporal and spatial variations in extreme temperature and precipitation events in Inner Mongolia were analyzed based on the daily maximum temperature, minimum temperature, and precipitation data during the period of 1960-2017. The results showed that warm extreme indices, such as SU25, TX90p, TN90p, and WSDI, significantly increased, whereas the cold extreme indices, such as FD0, TX10p, TN10p, and CSDI, significantly decreased; all indices have obvious abrupt changes based on the Mann-Kendall test; nighttime warming was higher than daytime warming. Extreme precipitation indices slightly decreased overall. All of the extreme temperature and precipitation indices had long-range correlations based on detrended fluctuation analysis (a > 0.5), thereby indicating that the extreme climate indices will maintain their current trend directions in the future. ENSO, AO, and IOD had a strong positive influence on warm extremes and a strong negative influence on cold extremes in Inner Mongolia. NCEP/NCAR and ERA-20CM reanalysis showed that strengthening anticyclone circulation, increasing geopotential height, decreasing daytime cloudiness and increasing nightime cloudiness contributed to changes in climate extremes in Inner Mongolia.
由于全球变暖，极端气候事件已成为一个重要问题，不同地理区域对气候变化的敏感性不同。因此，基于 1960-2017 年期间的日最高温度、最低温度和降水数据，分析了内蒙古极端温度和降水事件的时空变化。结果表明，暖极端指数（如 SU25、TX90p、TN90p 和 WSDI）显著增加，而冷极端指数（如 FD0、TX10p、TN10p 和 CSDI）显著减少；所有指数均通过 Mann-Kendall 检验具有明显的突变；夜间升温高于白天升温。整体来看，极端降水指数略有下降。基于去趋势波动分析（a>0.5），所有极端温度和降水指数均具有长期相关性，这表明未来极端气候指数将保持当前趋势方向。ENSO、AO 和 IOD 对内蒙古暖极端有强烈的正影响，对冷极端有强烈的负影响。NCEP/NCAR 和 ERA-20CM 再分析表明，加强反气旋环流、增加位势高度、减少白天云量和增加夜间云量导致了内蒙古极端气候的变化。
