Changes between Version 2 and Version 3 of Scripts/FluxnetValidation/DataProcessing


Ignore:
Timestamp:
01/28/13 14:09:19 (8 years ago)
Author:
nvuilsce
Comment:

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  • Scripts/FluxnetValidation/DataProcessing

    v2 v3  
    3737 
    3838For all fields except precipitation, we estimate the slope and intercept of the linear regression between Fluxnet and ERA-interim time series in order to correct for ERA-interim bias.[[BR]] 
     39We constrain the intercept of the linear regression to equal 0 for the shortwave down radiation and the wind speed.[[BR]] 
    3940For precipitation, we simply compare the cumulative amounts over all the 6-hourly time steps where fluxnet and ERA-interim data are available.[[BR]]  
    40 Vapour pressure deficit from ERA-interim products is calculated by using the Magnus Tetens relationship based on Air water deficit, Air temperature and Surface pressure (Murray, 1967, http://cires.colorado.edu/~voemel/vp.html).  
     41Water Vapor Pressure from ERA-interim and Fluxnet products is calculated by using the Magnus Tetens relationship based on Air water deficit, Air temperature and Surface pressure (Murray, 1967, http://cires.colorado.edu/~voemel/vp.html).  
    4142 
    4243When there are gaps in the Fluxnet time-series, 3-hourly non-bias ERA-interim data are used and consequently interpolate to match the half-hourly time resolution of the Fluxnet data. 'Air Temperature', 'Water Vapour Pressure', 'Wind speed', 'Longwave down Radiation' and 'Pressure' are linearly interpolated. 3-hourly precipitation are spread at half-hourly resolution using the observed mean frequency of precipitation. For the shortwave down radiation interpolation, we account for the solar angle evolution over the 3-hourly time period.