Gaoyuan qixiang (Apr 2022)

Characteristics of Climate Change and Its Impact Assessment in the Three-River Regions

  • Hongmei LI,
  • Liangdong YAN,
  • Tingting WEN,
  • Xiaoli FENG

DOI
https://doi.org/10.7522/j.issn.1000-0534.2021.00101
Journal volume & issue
Vol. 41, no. 2
pp. 306 – 316

Abstract

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Based on the daily meteorological data from 1961 to 2020 and the EOS / mods monitoring data from 2006 to 2020 in the Three-River Regions， the variation trend of temperature， precipitation and extreme climate index was analyzed by using the probability density distribution function and linear trend analysis.The results show that： （1） the temperature drifts to high temperature from 1961 to 2020， and the warming rates of the annually average， maximum and minimum temperature was 0.38 ℃， 0.28 ℃ and 0.45 ℃ per 10 years respectively（P<0.01）.Accordingly the extreme temperature indices （warm days， warm night days） increased significantly， and the extreme temperature indices （cold days， cold night days） decreased rapidly.（2） Compared with the previous climate state （1961 -1990）， the annual average， maximum and minimum temperatures increased by 1.28 ℃， 1.12 ℃ and 1.60 ℃ respectively from 1991 to 2020， and the probability density distribution was more flat， indicating that the temperature dispersion was greater and the climate instability was enhanced.（3） In the past 60 years， the precipitation has not increased significantly， with a change rate of 10.3 mm per 10 years.However， with the increase of precipitation， the change trend of precipitation is more and more obvious.Entering the 21st century， the increase of precipitation is more obvious.（4） Under the influence of significant temperature rise and precipitation increase， compared with the second glacier inventory， the area of Gladandon glacier and Animaqing glacier will be reduced by 5.51% and 4.96% respectively， and the ice storage will be reduced by 23.43% and 4.39% respectively from 2019 to 2020； The annual maximum depth of frozen soil decreases rapidly with a change rate of 7.1cm per 10 years， and the average freezing period shortens by 12.0 days per 10 years； The number of snow days and accumulated snow area increased.The lake area shows an increasing trend due to the increase of glacial water and precipitation.

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