Accuracy Evaluation of ERA5-Land Temperature Data in Chinese Mainland
Huang Xiaolong
Han Shuai
Wu Wei
Wang Liwei
Li Shiying
Jiang Yuhe
Abstract：Based on the observations collected from 2038 national weather stations in Chinese Main-land from 2018 to 2020,the accuracy and adaptability of the latest generation of ERA5-Land reanalysis data of hourly temperature dataset in Chinese mainland are evaluated.The results are as follows:(1)During the assessment period,the ERA5-Land temperature can better reflect the characteristics of the temperature change in Chinese mainland,but it is somewhat lower than that observed by meteorological stations.(2)The evaluation of daily temperature variation shows that the temperature error from 06:00 to 09:00(UTC)is slightly larger than that at other times.(3)The evaluation of monthly and seasonal tem-peratures shows that the temperature error decreases gradually from January to July and increases gradually from July to the next January,with greater errors in winter than in summer.(4)The assessment of differ-ent topographies shows that,with the rises in altitude and slope,the correlation between ERA5-Land temperature and station-observed temperature has a decreasing trend while their error is gradually increas-ing.Overall,ERA5-Land temperature datasets are of good applicability in Chinese mainland,and can provide data support for climate change,scientific research and sustainable development.
Keywords：ERA5-Landtemperaturereanalysis dataaccuracy evaluation
Publication Date：2025-07-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：11( 8-18 )