The Characteristics and Mutation Analysis of Temperature Variation during the Period of Shu Jiu in Xi’an in Recent 40 Years
By using the daily temperature, barometric pressure, maximum wind speed data from 1971 to 2010 of Xi’an with Mann-Kendall method and F test applied, the characteristics of average temperature and daily minimum temperature variation in the period of Shu Jiu in Xi’an were analyzed. We found that the cold period in winter in Xi'an appeared between the San Jiu and Si Jiu, and the coldest period was San Jiu. During San Jiu, the daily average temperature was -0.01℃, and daily minimum temperature was -3.62 ℃. The average and minimum temperatures from Yi Jiu to San Jiu in Xi'an showed a cooling trend, the temperatures of other Jiu periods were on the rise. The average and daily minimum temperatures in Shu JIU in Xi'an showed a warming trend with the annual variation, when the average temperature mutation occurred in the 1980s, and showed a significant warming trend since 1993. The daily minimum temperature raised significantly after 2005.
Shu Jiutemperature variationmutation analysiscold periodF test