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《Plateau Meteorology》 2013-04
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Comparison of Reanalysis Data and Observation about Summer/Winter Surface Air Temperature in Tibet

SUN Yu-ting,GAO Qing-jiu,MIN Jin-zhong(Key Laboratory of Meteorological Disaster of Ministry of Education/College of Atmospheric Sciences, Nanjing University of Information Science & Technology,Nanjing 210044,China)  
Using in-situ observed summertime/wintertime air temperatures(OT) in Tibet,2 m temperature reanalysis data of the NCEP/NCAR(NT1),the ERA-40(ET1),the NCEP/DOE(NT2),the ERA-Interim(ET2) and the JRA-25(JT) on a monthly basis,climate mean,variance,climate trend,interannual and interdecadal variability are explored.The results show that:(1) The values of the five reanalysis temperatures on Tibet are lower than that of observations,and the departure is greater in winter.After the terrain height revision,the differences decrease distinctly,especially ET1,ET2 and JT.(2) The variations of OT are greater in northern Tibet than that in southern and in winter than in summer in most areas.In eastern Tibet,ET1,ET2 and JT data ability to reproduce the interannual variation of air temperatures is higher than NT1 data,in the midwestern Tibet,the four data are fairly;but NT2 data are poor.(3) While OT has the significant linear warming trend,and the trend is much greater in winter than in summer in most of Tibet,no trend is observed in reanalysis data.(4) Both NT1 and ET1 can not reflect the interdecadal variation of OT with features that is smaller value than average before 1980,keeping average during the period of early 1980 to late 1990,and shifting to a higher value than average in recent two decades.(5) ET2 and JT are close and can better to represent the observed climate mean,interannual variation and variability than NT2.(6) The order of similarity of distributions for correlation coefficient between observations and reanalysis temperature is JTET2ET1NT1NT2 from small to big in winter and summer.
【Fund】: 公益性行业专项(GYHY200806029);; 江苏高校优势学科建设工程资助项目(PAPD)
【CateGory Index】: P467
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