In this study, 2 m air temperature data from 24 meteorological stations in the Qilian Mountains (QLM) are examined to evaluate ERA-Interim reanalysis temperature data derived from the European Centre for Medium-Range Weather Forecasts (ECMWF) for the period of 1979–2017. ERA-Interim generally captures the monthly, seasonal, and annual variation very well. High daily correlations ranging from 0.956 to 0.996 indicate that ERA-Interim captures the daily temperature observations very well. However, an average root-mean-square error (RMSE) of ±2.7°C of all stations reveals that ERA-Interim should not be directly applied at individual sites. The biases are mainly attributed to the altitude differences between ERA-Interim grid points and stations. The positive trend (0.457°C/decade) is significant over the Qilian Mountains based on the 1979–2017 observations. ERA-Interim captures the warming trend very well with an increase rate of 0.384°C/decade. The observations and ERA-Interim both show the largest positive trends in summer with the values of 0.552°C/decade and 0.481°C/decade, respectively. We conclude that in general ERA-Interim captures the trend very well for observed 2 m air temperatures and ERA-Interim is generally reliable for climate change research over the Qilian Mountains.

中文翻译：

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祁连山地区ERA中期气温数据评估

在这项研究中，对祁连山（QLM）的24个气象站的2 m空气温度数据进行了评估，以评估1979年以来欧洲中距离天气预报中心（ECMWF）得出的ERA临时再分析温度数据。 2017。ERA-Interim通常可以很好地捕获月度，季节和年度变化。每天的高相关性介于0.956至0.996之间，这表明ERA-Interim可以很好地捕获每日温度观测值。但是，所有站点的平均均方根误差（RMSE）为±2.7°C，这表明ERA-Interim不应直接应用于各个站点。偏差主要归因于ERA-临时网格点和测站之间的高度差。积极趋势（0。根据1979-2017年的观测，在祁连山地区457°C /十年是很有意义的。ERA-Interim以0.384°C /十年的速率很好地捕获了变暖趋势。观测值和ERA-Interim均显示夏季最大的正趋势，分别为0.552°C /十年和0.481°C /十年。我们得出的结论是，总体而言，ERA-Interim很好地捕捉了观测到的2 m气温的趋势，并且ERA-Interim对于祁连山的气候变化研究总体而言是可靠的。