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Meteorological Features at 6 523 m a.s.l.on the North Slope of Mt.Qomolangma from May 1 to July 22 in 2005

XIE Ai-hong, REN Jia-wen, QIN Xiang, JIANG You-yan (Key Laboratory of Cryosphere and Environment,CAREERI,CAS,Lanzhou Gansu 730000,China)  
An automatic weather station was set up on April 27 2005 at the Ruopula Pass(6 523 m a.s.l.) on the northern slope of Mt.Qomolangma(Everest) by the team of integrated scientific expedition to Mt.Qomolangma.In this paper the meteorological features were analyzed based on the 10-minute-averaged and 24-hour records of air temperature,relative humidity,saturated vapor pressure,air pressure and wind from May 1 to July 22 in 2005.It is shown that at 6523 m a.s.l.of Mt.Qomolangma,these meteorological elements display very obvious diurnal variations,and the averaged diurnal variation was one-peak-one-vale for air temperature and saturated vapor pressure, one-vale for relative humidity,two-peak-two-vale for air pressure,and one-peak in an asymmetrical way for wind speed.In the 83 days,all the air temperature,relative humidity,saturated vapor pressure and air pressure increased with some fluctuations,while wind speed decreased gradually,and frequency of calm wind went up and wind direction turned from north to south.Variations of relative humidity and saturated vapor pressure have great fluctuation and obvious local difference.Finally,the reasons of the diurnal and daily variations are discussed.Compared with the records of May in 1960,the 5-day maximum,minimum and averaged values of air temperature in May 2005 were apparently lower.
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