Abstract:

Based on the daily air temperature ( average and maximum) data from 75 stations from 1961 to 2010 in Gansu Province，the trend and the distribution characteristic of the extreme high temperature were analyzed． The result showed that the temperature in Gansu presented an increasing trend in recent 50 years． Under the climate warming background，the frequency of extreme high temperature events in Gansu increased． The temperature increased obviously and the stations with extreme high temperature increased also after the
middle of the 1990s，especially in the middle and south region of Gansu Province． There were four extreme value area for high temperature days，including the midwest of Hexi，the southwest part of Longzhong，the south part of Longdong and the south part of Longnan．The extreme hot days increased by 0． 1 d / 10 a in most of Gansu，but decreased in some place of Hexi，longzhong，Longdong and Longnan．

Key words: extreme high temperature, hot days, Gansu

摘要：

利用1961 ～ 2010 年甘肃省75 个气象站逐日平均、最高气温资料，分析了甘肃省极端高温的变化趋势及分布特征。结果表明: 甘肃省近50 a 来气温呈上升趋势，伴随气候变暖，甘肃极端高温事件增多。20 世纪90 年代中期之后，气温明显上升，出现极端高温的站数急剧增多，陇中和陇南增加最为明显; 极端高温日数分布，存在4 个高值区，即河西中西部、陇中西南部、陇东南部和陇南南部; 近50 a 甘肃省极端高温日数以0． 1 d /10 a 的趋势增多，其中陇中的临夏州以0． 3 d /10 a 的趋势在增加，河西、陇中、陇东和陇南有个别地区趋于减少。

关键词: 极端高温, 高温日数, 甘肃