关键词: 关键词：内蒙古, 积雪深度, 再分析资料, 适用性评估

Abstract:  Based on snow depth during 1981-2010 from two reanalysis data sets :ERA-Interim/Land (hereafter referred to as Land) and ERA-20C (hereafter referred to as 20C), the observation data of meteorological stations in Inner Mongolia were taken as the standard, the applicability of snow depth of reanalysis in Inner Mongolia was evaluated comprehensively. The results were as follows: (1) Two reanalysis data sets both reproduced the spatial distribution of snow depth in Inner Mongolia, showing a significant decline trend from northeast to southwest, and 20C reanalysis described well in spatial distribution in descending order from northeast to southwest. (2) Monthly variation of average snow depth of Land reanalysis was compared with observations, it was found that a negative deviation existed on the whole and average snow depth of Land reanalysis was systematically underestimated. However, the simulation effect of 20C reanalysis in eastern and western region was good, and simulated snow depth of  20C reanalysis was compared with observations, it was found that the positive deviation of 20C reanalysis was larger in the central region. (3) The two reanalysis data sets reprensented well in monthly variation of snow depth in eastern, central and western Inner Mongolia. The simulation effect of 20C reanalysis was better than that of Land reanalysis. Simulation effect was best in the eastern region, followed by the central region, and the western region was worst. (4) The mean deviation and root mean square error of snow depth of two reanalysis data sets were relatively small, correlation coefficient between reanalysis and observed snow depth passd the 0.001 significance test. The difference of snow depth of two reanalysis data sets was smaller, but the difference between reanalysis and observed snow depth showed a negative bias.

Key words: Key words: Inner Mongolia, snow depth, reanalysis data, applicability assessment