An overview of temperature vrariations on the Qinghai-Tibetan plateau in the recent hundred years using UK CRU high resolution grid data

With the high resolution ground temperature data from the East Anglia Climatic Research Unit University(abbreviation CRU) and by means of EOF,REOF and linear trend analysis methods,Qinghai Tibetan plateau surface temperature with temporal and spatial distribution characteristics and change trends in the recent hundred years were analyzed.The results showed that space consistency was characterized by plateau temperature spatial structure features;in addition,for plateau air temperature distribution in space,there was an north-south reversed structure.With the variance maximizing rotation,the temperature variations could be divided into the central plateau region,western region,northern region,southern region and the eastern region. For nearly a hundred yeaxs of rising temperature,the climate tendency rate was about 0.07℃/10 a,undergoing a four alternating cold and warm period:from the 1901 to 1930 cold period;from 1931 to 1950 warm period, there was an obvious increase in temperature;from 1950 until around 1980,plateau temperature changes had been relatively stable in general;and from 1980 to the present,high temperatures has been on the rise at a rapid channel.Plateau air temperature changes occurred mainly in the quasi 60 year period and,at the same time,there were also 30 years of quasi periodic oscillation and a presence of multiple point mutations.In each area in the recent hundred years the temperature has been rising:in the central Qinghai-Tibetan plateau the climate tendency rate was 0.065℃/10 a;the western area increased significantly,with the climate tendency rate of 0.128℃/10 a;the rate for the northern area was 0.108℃/10 a,and 0.015℃/10 a for the southern part;the east part was 0.022℃/10 a.Most of the regions passed theα= 0.01 reliabihty test.Of the various regions with different temperature characteristics,the central and northern areas showed similar trends,while the eastern area had more frequent positive and negative alternations.