1951—2006年包头气温极端事件变化分析

Changes in Extreme Temperature Events in Baotou during 1951—2006

利用包头气象站1951—2006年逐日平均气温资料,建立了高温和低温极端气候事件的阈值,检测了56年来包头逐日气温的极端事件出现频率,分析了极端事件的年、季、月变率。统计了逐日平均气温的各级别出现频数。结果显示:该地区56年里气温显著升高,平均每10年升高0.42℃;在56年时间尺度上平均气温有明显的由冷变暖的突变特征,突变点为1987年;气候变暖后,高温事件明显增多,低温事件明显减少。

Based on the daily mean temperature data of Baotou weather station from 1951 to 2006, established the threshold value of the extreme climate events of high temperature and low temperature, detected the frequency of daily extreme temperature events in Baotou in 56 years, analyzed the change rate of extreme events in yearly, quarterly and monthly, counted the present frequency of different daily mean temperature ranks. Result shows： the temperatures in Baotou obviously elevate in 56 years, elevated 0.42℃/10 year. The average temperature had obviously sudden change characteristic from cold to warm in 56 years, the point of discontinuity was at 1987; after climate warming, the high temperature events have evident increased and the low temperature events reduced obviously.