【摘要】 地表温度综合反映了大气和地表植被、土壤等局地因素相互作用的能量交换状况,是许多冻土分布模型和寒区陆面过程模式的上边界条件,对多年冻土分布和活动层厚度估算具有重要意义。为了检验ERA-Interim再分析地表温度资料在青藏高原(下称高原)多年冻土区的适用性,综合比较了2011年1月1日至2012年12月31日期间高原不同类型多年冻土区3个综合观测场的观测地表温度和ERA-Interim再分析资料之间的偏差、均方差、相关系数、解释方差、均方根误差和平均绝对误差。结果表明,ERA-Interim再分析资料能较好地再现高原多年冻土区3个综合观测场地表温度的基本特征,并能较好地描述高原地表温度的季节变化。但ERA-Interim再分析年平均地表温度比观测值偏低,西大滩、五道梁和唐古拉站依次偏低1.7,1.0和0.9℃;地表温度的再分析值和观测值之间的相关系数和解释方差都较高,均方差也相近。ERA-Interim再分析地表温度资料对观测站点相对稀少且空间分布不均匀的高原多年冻土区具有较好的适用性,可以作为地表温度的有效代用资料。更多还原

【Abstract】 The land surface temperature( LST) is an important variable between atmosphere and ground surface.The LST can impact permafrost distribution and is also a significant parameter for mapping the permafrost distribution. In order to validate the ERA product of land surface temperature over the Qinghai-Xizang Plateau,the ERA product of LST with the observations at three metrological stations from 1 January 2011 to 31 December2012 have been compared. And the biases,mean square errors,correlation coefficients,fractional error and index of agreement have been analyzed. The results showed that the ERA product of LST can reflect general characteristics of the three metrological stations in the permafrost region. But LST of the ERA product is a little lower than that of the observations,which Xidatan was 1. 7℃ lower,Wudaoliang 1. 0℃ lower and Tanggula 0. 9℃lower. The correlation coefficients and explained variances are extremely high,while the mean square errors of the reanalysis data were respectively- 1. 7℃,- 1. 5℃ and- 0. 9℃. The RM SE were 2. 5℃,2. 6℃ and1. 7℃ at the three sites respectively. Though the LST of ERA product has some limitations applying in the permafrost regions of the Qinghai-Xizang Plateau,to some extent,it is convincible especially on the uneven distribution and lowdensity of metrological stations in the Qinghai-Xizang Plateau. It is still regarded as an effective proxy data of the land surface temperature in the permafrost region of the Qinghai-Xizang Plateau.更多还原