【摘要】 根据宁夏夏季暴雨日数资料、银川探空资料和NCEP再分析资料,分析了气候变暖背景下,宁夏暴雨日数的变化规律和成因。结果表明,气候变暖后年暴雨日数明显增多,6、7月白昼和夜间的暴雨日数增加,8月白昼的暴雨日数增加而夜间的减少。成因分析结果表明,气候变暖后7、8月白天的大气潜在不稳定性增强,夜间的大气潜在不稳定性7月增强而8月减弱,造成了银川上空大气温度垂直结构的日变化明显,导致了宁夏暴雨日数的增多和暴雨的日变化显著。更多还原

【Abstract】 By using the Ningxia summer torrential rain days data, the Yinchuan sounding data and the NCEP/NCAR reanalyzed data, the evolutional characteristics and the cause of Ningxia torrential rain days are analyzed under the background of climate warming. The results show that both annual torrential rain days and annual mean temperature displayed a consistent trend, which means that with increase in annual mean temperature, the annual torrential rain days also increased obviously. Further analysis results indicate that atmospheric potential instability has been grown in the daytime in both July and August after the climate warming (1986) of Ningxia, but in the nighttime it has been grown in July but decayed in August. Therefore, the climate warming not only caused more obvious diurnal variation of the vertical distribution of atmospheric temperature in Yinchuan, but also resulted in the increase of torrential rain days and in more obvious diurnal variation of the torrential rain in Ningxia.更多还原