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Spatial-temporal Variation of Air Temperature for the Recent 40 Years in Lhasa

Meteorological and Environmental Research 2021年第1期12卷 6-12页

作者： Yang LEI Hongbin WANG Baixue YU Wenxue FU Tongsuo LU Xinyu LIU Dong WEI School of Science Tibet UniversityLhasa 850000China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Technology Tibet UniversityLhasa 850000China Lhasa Meteorological Service Lhasa 850000China

It was all known that Lhasa went through a high temperature of 30.8℃in late June 2019,which hit record *** better understand the reasons,based on observations recorded at automatic weather stations in Lhasa,the characteristics of temperature variation at multiple time scales were studied using the linear trend method,Mann-Kendall mutation test,Morlet wavelet analysis,R/S analysis and so *** results showed that:(a)the annual mean temperature(AMT)is rising at a rate of 0.5℃/10 a,and the average temperature for different seasons also increased significantly,especially in winter.(b)Although there was an intersection in 1995,it was found that AMT,did not pass the reliability test of significance levelα=0.05,this means there are no abrupt changes for AMT,the values are 7.97 and 9.15℃respectively before and after the intersection point.(c)AMT has a periodic oscillation for 18-25 and 25-32 a based on a mass of data and the wavelet variance diagrams in *** has a main cycle of 28 a,cyclic patterns of temperature changes in spring,summer and autumn is similar to AMT,but it is relatively complex in winter.(d)The Hurst index of AMT and different seasons demonstrates that the temperature is likely to continue to rise in the future in Lhasa.

关键词： Global warming An abrupt change of temperature the correlation coefficient High altitudes The Tibetan Plateau Morlet wavelet analysis

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