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Evaluation of snow depth and snow cover fraction simulated by two versions of the flexible global ocean-atmosphere-land system model

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Abstract

Based on historical runs, one of the core experiments of the fifth phase of the Coupled Model Intercomparison Project (CMIP5), the snow depth (SD) and snow cover fraction (SCF) simulated by two versions of the Flexible Global Ocean-Atmosphere-Land System (FGOALS) model, Grid-point Version 2 (g2) and Spectral Version 2 (s2), were validated against observational data. The results revealed that the spatial pattern of SD and SCF over the Northern Hemisphere (NH) are simulated well by both models, except over the Tibetan Plateau, with the average spatial correlation coefficient over all months being around 0.7 and 0.8 for SD and SCF, respectively. Although the onset of snow accumulation is captured well by the two models in terms of the annual cycle of SD and SCF, g2 overestimates SD/SCF over most mid- and high-latitude areas of the NH. Analysis showed that g2 produces lower temperatures than s2 because it considers the indirect effects of aerosols in its atmospheric component, which is the primary driver for the SD/SCF difference between the two models. In addition, both models simulate the significant decreasing trend of SCF well over (30°-70°N) in winter during the period 1971–94. However, as g2 has a weak response to an increase in the concentration of CO2 and lower climate sensitivity, it presents weaker interannual variation compared to s2.

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Authors and Affiliations

  1. Ministry of Education Key Laboratory for Earth System Modeling, Center of Earth System Sciences, Tsinghua University, Beijing, 100084, China

    Kun Xia, Bin Wang, Wenyu Huang, Shiming Xu & Li Liu

  2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

    Kun Xia, Bin Wang, Lijuan Li, Si Shen & Li Dong

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  1. Kun Xia
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  2. Bin Wang
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Correspondence to Bin Wang.

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Xia, K., Wang, B., Li, L. et al. Evaluation of snow depth and snow cover fraction simulated by two versions of the flexible global ocean-atmosphere-land system model. Adv. Atmos. Sci. 31, 407–420 (2014). https://doi.org/10.1007/s00376-013-3026-y

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