ERA5-Land温度数据对我国树木年轮与气候关系研究的适用性评估  

Applicability assessment of ERA5-Land temperature data in the research of the relationship between tree rings and climate in China

作　　者：王泽 关梦茜 吴芳 袁帅 曹鹏鹤 江源[1,2] WANG Ze;GUAN Mengxi;WU Fang;YUAN Shuai;CAO Penghe;JIANG Yuan(Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization,Beijing Normal University,Beijing 100875;Faculty of Geographical Science,Beijing Normal University,Beijing 100875;School of Systems Science,Beijing Normal University,Beijing 100875)

机构地区：[1]北京师范大学中药资源保护与利用北京市重点实验室,北京100875 [2]北京师范大学地理科学学部,北京100875 [3]北京师范大学系统科学学院,北京100875

出　　处：《第四纪研究》2024年第4期1031-1043,共13页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:42171049)资助。

摘　　要：树木年轮与气候关系研究中,尚未明确高空间分辨率长时间序列的ERA5-Land温度数据是否可以代替气象站点温度数据、使用两种不同来源的温度数据得出的结论是否具有可比性。本研究通过对比ERA5-Land年平均温度、月平均温度和气象站点同种温度数据的相关关系及数值差异,评估ERA5-Land温度数据在我国树木年轮与气候关系研究中的适用性,使用公开发表的树轮年表进行实证分析。结果表明:1)全国范围内ERA5-Land温度数据与站点数据整体上具有极显著的正向强相关关系,相关关系弱和无显著相关关系的地点集中分布在青藏高原和云贵高原;2)全国范围内ERA5-Land年均温比站点数据年均温整体平均偏低0.82℃,偏低程度最大的点集中分布在青藏高原,偏高程度最大的地点集中分布在第二、三阶梯低海拔地区的山区;3)随着海拔高度的增加,两组数据的正相关关系减弱,ERA5-Land年均温、月均温低出站点数据的数值增大。不同区域ERA5-Land温度和气象站点温度的相关关系和数值差异具有多样性。在两种数据相关关系较弱、ERA5-Land温度高于或低于站点温度的区域中,基于ERA5-Land温度数据和树木年轮重建的历史温度也会偏高或偏低。因此,在树木年轮的研究中使用温度资料时,应综合考虑ERA5-Land温度和气象站点温度的相关关系和数值差异,根据应用需求选择适当的数据。In dendrochronological studies,whether ERA5-Land temperature with high spatial resolution and long time series can replace the temperature data from meteorological stations,and the consistency of results using different types of temperature is unknown.We assessed the applicability of ERA5-Land temperature for the study of dendrochronology in China,compared the correlation and numerical difference between the annual and monthly mean temperature data from ERA5-Land and meteorological stations.We also used the publicly published tree-ring chronology for empirical analysis.The results showed that:In different regions,the correlation and numerical difference between temperature data from ERA5-Land and meteorological stations were diversified.On a national scale,there exists a highly significant strong positive correlation between ERA5-Land and station temperature data.Locations with weak or not significantly correlated relationships are mainly concentrated in the Qinghai-Xizang Plateau and Yunnan-Guizhou Plateau.Nationwide,the annual mean temperature of ERA5-Land was,on average,0.82℃lower than the annual average temperature of station data.Points with the greatest degree of lower deviation were mainly concentrated in the Qinghai-Xizang Plateau,while points with the greatest degree of higher deviation were mainly concentrated in mountainous areas at the China's second and third gradient low-altitude mountainous regions.As elevation increased,the positive correlation between the two types of data weakened,and the numerical difference between the two types of data increased.Empirical analysis showed that,if there was a strong correlation between the two types of temperature data,then the correlation results between the tree-ring chronology and ERA5-Land temperature data were almost as same as the correlation results between the tree-ring chronology and meteorological station temperature data.If the correlation between the two types of data was weak and ERA5-Land temperature was lower than meteorological station tempera

关 键 词：树木年轮 ERA5-Land 温度 适用性评估 实证分析 

分 类 号：P467[天文地球—大气科学及气象学]