Using daily mean temperature data from 82 national meteorological observation stations in Guizhou Province from 1961 to 2021,the spatiotemporal distribution characteristics of days with daily mean temperature below 10 ℃ are analyzed.The results show that the time period with daily mean temperature below 10 ℃ in Guizhou Province ranges mainly from late November to early March,showing a spatial distribution feature of more in the northwest and less in the south.The number of days with daily mean temperature below 10 ℃ in autumn,winter,and spring tends to decrease,with the fastest decrease occurring in spring.The average start(end)date with daily mean temperature below 10 ℃ is gradually delayed(advanced)from northwest to south.Since the late 1990s,the start(end)date have shown a significant tendency to be later(earlier).The mutation of annual days with daily mean temperature below 10 ℃ concentrated in the 1990s-2000s,showing a distribution pattern where the southern regions experienced mutations earlier than the northern regions.After the mutation,the number of days with daily mean temperature below 10 ℃ decreased significantly,with a significant decrease in the central region from east to west.There are significant oscillation periods of 10-12 years,4-6 years,and 3 years for annual days with daily mean temperature below 10 ℃ in Guizhou Province,with the oscillation period of 3 years being the most significant.The distribution of the number of days with daily mean temperature below 10 ℃ is not only influenced by altitude,but also by factors such as geographical location and weather system.
关键词
贵州省/日平均气温＜10℃/变化特征
Key words
Guizhou Province/daily mean temperature below 10℃/variation characteristic
维普
万方数据