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Variations of extreme temperature in the mount qomolangma region in China during 1971-2020

Journal of mountain Science 2023年第12期20卷 3488-3499页

作者： WANG Shun-jiu Sichuan Provincial Climate Centre Chengdu 610072China Institute of Plateau Meteorological China Meteorological AdministrationChengdu 610072China Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province Chengdu 610072China

According to observational daily temperature data from the meteorological stations during 1971-2020,the variations of the extreme temperature event in the mount qomolangma(also known as mount Everest) region in China have been analyzed using statistical *** extreme temperature indices recommended by the World Meteorological Organization are selected to describe the extreme temperature *** RClimDEX 1.0 software is used to calculate the extreme temperature *** are no tropical nights,and just three summer days at the last 50 *** frost days are the main extreme temperature events all year *** temperature in the north slope is more extreme than that in the south slope of the mount *** is remarkable decadal variation for the extreme temperature indices except diurnal temperature *** are the warm extremes increasing,however,the cold extremes decreasing with the decadal lapse,which is more remarkable into the 21^(th) *** tendencies for the extreme temperature indices in the north slope are consistent with those in the south *** are statistically significant trends for most extreme temperature indices during the study *** shows that the warm extremes would be more prominent in the future with the global continued *** abrupt changes of the extreme temperature index have occurred mainly in the 20^(th) century especially from the mid to late 1980s and *** periodic changes in the south slope do not synchronize those in the north slope for the most extreme temperature *** is different for most extreme temperature indices between the south and north slope,which has demonstrated that the regional or local changes are not neglectable for extreme temperature *** results of this study are also the consistent response of extreme temperature event to the global warming.

关键词： Extreme temperature Variation Trend Statistical analysis mount qomolangma mount Everest

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Variation in the surface heat flux on the north and south slopes of mount qomolangma

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Atmospheric and Oceanic Science Letters 2024年第5期17卷 28-33页

作者： Yonghao Jiang Maoshan Li Yuchen Liu Ting Wang Pei Xu Yaoming Ma Fanglin Sun School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Chengdu Plain Urban Meteorology and Environment Observation and Research Station of Sichuan Province Chengdu University of Information TechnologyChengduChina Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesCAS Center for Excellence in Tibetan Plateau Earth SciencesBeijingChina Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Chinese Academy of SciencesLanzhouChina

The distinctive conditions present on the north and south slopes of mount qomolangma,along with the intricate variations in the underlying surfaces,result in notable variations in the surface energy flux patterns of the two *** this paper,data from TESEBS(Topographical Enhanced Surface Energy Balance System),remote sensing data from eight cloud-free scenarios,and observational data from nine stations are utilized to examine the fluctuations in the surface heat flux on both *** inclusion of MCD43A3 satellite data enhances the surface albedo,contributing to more accurate simulation *** model results are validated using observational *** RMSEs of the net radiation,ground heat,sensible heat,and latent heat flux are 40.73,17.09,33.26,and 30.91 W m^(−2),*** net radiation flux is greater on the south slope and exhibits a rapid decline from summer to *** to the influence of the monsoon,on the north slope,the maximum sensible heat flux occurs in the pre-monsoon period in summer and the maximum latent heat flux occurs during the *** south slope experiences the highest latent heat flux in *** dominant flux on the north slope is sensible heat,while it is latent heat on the south *** seasonal variations in the ground heat flux are more pronounced on the south slope than on the north *** in summer,the ground heat flux on the north slope surpasses that on the south slope.

关键词： mount qomolangma TESEBS model Remote sensing retrieval Surface heat fluxes

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Water quality and light absorption attributes of glacial lakes in mount qomolangma region

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Journal of Geographical Sciences 2013年第5期23卷 860-870页

作者： YAN Huimin YAO Zhijun HUANG Heqing JIANG Dong DONG Xiaohui DUAN Rui ZHANG Yili Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China

As they are products of glacier movement, the water body composition and water quality attributes of glacial lakes have distinct characteristics compared with inland lakes. Although satellite remote sensing provides an effective approach to monitor water quality, lack of in-situ measurement data on the status and environment surrounding glacial lakes presents a major constraint in relating satellite data to water quality indicators. This study presents findings of a preliminary investigation into water quality attributes of 3 glacial lakes in the mount qomolangma region. Suspended particulate matter （SPM）, light absorption attributes of phytoplankton, nonalgal particles （NAP）, and colored dissolved organic matter （CDOM） were measured. The suspended substance concentration varies markedly from 0-320 mg/L. This is considered to reflect differing stages of lake development. l-he chlorophyll concentra- tion is much lower than that found for inland lakes, as landscapes that surround these high altitude lakes have almost no vegetation growth. The phytoplankton and CDOM concentration depend on long-term stability of lake slopes. Given the lack of exogenous and endogenous inputs in the qomolangma region, CDOM in glacial lakes is significantly lower than in inland lakes. These preliminary findings could support efforts to appraise estimates of water quality parameters using remotely sensed images.

关键词： mount qomolangma glacial lake water quality light absorption remote sensing

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