TITLE:
Assessment of Extreme Temperature in the Qinghai-Xizang Plateau and Surrounding Areas
AUTHORS:
Jia Song, Xinrui Xie, Xiaohang Wen
KEYWORDS:
Qinghai-Xizang Plateau, Extreme Temperature, M-K Test
JOURNAL NAME:
Open Access Library Journal,
Vol.11 No.7,
July
25,
2024
ABSTRACT: This study utilizes hourly temperature data from the China Meteorological Administration to assess extreme temperatures on the Qinghai-Xizang Plateau. The annual and seasonal variations of extreme temperatures from 2005 to 2020 are analyzed using methods such as the climate tendency rate, T-test, and Mann-Kendall mutation test. Additionally, the study explores the impact of meteorological factors on sudden changes in extreme temperature indices. The results show that the frequency of warm weather increases at a rate of 12 days per decade. The earliest occurrence of high-temperature weather has advanced to the end of March and is expected to continue advancing. The minimum value of the maximum temperature (TXn) shows a decreasing trend, whereas the maximum value of the minimum temperature (TNx) shows an increasing trend, with annual variation rates of −2.5˚C per decade and 2˚C per decade, respectively. These trends are consistent with their seasonal variations. The number of warm nights (TX90p) and cold nights (TN10p) shows positive annual growth trends, with rates of 11.2 days per decade and 19.9 days per decade, respectively. Both indices exhibit positive growth trends across all seasons. The annual growth rates of frost days (FD) and summer days (SU) are 27 days per decade and 6.8 days per decade, respectively. Notably, the growth rate of frost days (FD) is significantly higher than that of summer days (SU) in both annual and seasonal variations.