ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 40 Issue 9 > 2014,40(9):1123-1131. DOI:10.7519/j.issn.1000-0526.2014.09.010 Prev Next
Comparisons of Atmospheric Specific Humidity in Reanalysis Datasets and Homogenized Radiosonde Dataset in China
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Abstract:
Based on monthly mean homogenized radiosonde temperature and dewpoint depression dataset from 98 stations in China during the period 1980-2010, NCEP/NCAR reanalysis dataset, ERA Interim reanalysis dataset and JRA 25 reanalysis dataset, a comparative analysis of specific humidity from these four datasets over China is performed by means of analogical analysis and tendency analysis. The results suggest that: (1) In terms of spatial distributions, the spatial correlation coefficients between JRA and OBS datasets are the highest. (2) The values of three reanalysis datasets are generally higher than that of radiosonde dataset, JRA dataset is much closer to observed dataset except for several stations and levels. Relative tolerance between reanalysis and radiosonde datasets increases with height and it is higher in winter and spring than in summer. (3) When it comes to the long term trend, JRA is closer to OBS in lower troposphere, and in middle and upper troposphere, ERA is much closer to OBS.
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