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Continental-scale water and energy flux analysis and validation for North American Land Data Assimilation System project phase 2 (NLDAS-2): 2. Validation of model-simulated streamflow

Xia, Youlong ; Mitchell, Kenneth ; Ek, Michael ; Cosgrove, Brian ; Sheffield, Justin ; Luo, Lifeng ; Alonge, Charles ; Wei, Helin ; Meng, Jesse ; Livneh, Ben ; Duan, Qingyun ; Lohmann, Dag

Journal of Geophysical Research: Atmospheres, 2012-02, Vol.117 (D3), p.n/a [Periódico revisado por pares]

Washington, DC: Blackwell Publishing Ltd

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  • Título:
    Continental-scale water and energy flux analysis and validation for North American Land Data Assimilation System project phase 2 (NLDAS-2): 2. Validation of model-simulated streamflow
  • Autor: Xia, Youlong ; Mitchell, Kenneth ; Ek, Michael ; Cosgrove, Brian ; Sheffield, Justin ; Luo, Lifeng ; Alonge, Charles ; Wei, Helin ; Meng, Jesse ; Livneh, Ben ; Duan, Qingyun ; Lohmann, Dag
  • Assuntos: Budgets ; Climate ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Hydrology ; land surface modeling ; Meteorology ; NLDAS-2 ; Noah ; Stream flow ; streamflow ; validation ; VIC ; Water
  • É parte de: Journal of Geophysical Research: Atmospheres, 2012-02, Vol.117 (D3), p.n/a
  • Notas: ark:/67375/WNG-9HPHZ6DW-P
    istex:D7AC187693514FA23D1BF32C2139CD27B1C0DDC8
    ArticleID:2011JD016051
    Tab-delimited Table 1.Tab-delimited Table 2.
    This is a companion to DOI
    10.1029/2011JD016048
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: This is the second part of a study on continental‐scale water and energy flux analysis and validation conducted in phase 2 of the North American Land Data Assimilation System project (NLDAS‐2). The first part concentrates on a model‐by‐model comparison of mean annual and monthly water fluxes, energy fluxes and state variables. In this second part, the focus is on the validation of simulated streamflow from four land surface models (Noah, Mosaic, Sacramento Soil Moisture Accounting (SAC‐SMA), and Variable Infiltration Capacity (VIC) models) and their ensemble mean. Comparisons are made against 28‐years (1 October 1979–30 September 2007) of United States Geological Survey observed streamflow for 961 small basins and 8 major basins over the conterminous United States (CONUS). Relative bias, anomaly correlation and Nash‐Sutcliffe Efficiency (NSE) statistics at daily to annual time scales are used to assess model‐simulated streamflow. The Noah (the Mosaic) model overestimates (underestimates) mean annual runoff and underestimates (overestimates) mean annual evapotranspiration. The SAC‐SMA and VIC models simulate the mean annual runoff and evapotranspiration well when compared with the observations. The ensemble mean is closer to the mean annual observed streamflow for both the 961 small basins and the 8 major basins than is the mean from any individual model. All of the models, as well as the ensemble mean, have large daily, weekly, monthly, and annual streamflow anomaly correlations for most basins over the CONUS, implying strong simulation skill. However, the daily, weekly, and monthly NSE analysis results are not necessarily encouraging, in particular for daily streamflow. The Noah and Mosaic models are useful (NSE > 0.4) only for about 10% of the 961 small basins, the SAC‐SMA and VIC models are useful for about 30% of the 961 small basins, and the ensemble mean is useful for about 42% of the 961 small basins. As the time scale increases, the NSE increases as expected. However, even for monthly streamflow, the ensemble mean is useful for only 75% of the 961 small basins. Key Points First time to validate long‐term simulated streamflow for NLDAS A typical exmaple to evaluate NLDAS products Significant progress for NLDAS project
  • Editor: Washington, DC: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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