Changes between Version 2 and Version 3 of Scripts/FluxnetValidation/DataProcessing
- Timestamp:
- 2013-01-28T14:09:19+01:00 (11 years ago)
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Scripts/FluxnetValidation/DataProcessing
v2 v3 37 37 38 38 For 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]] 39 We constrain the intercept of the linear regression to equal 0 for the shortwave down radiation and the wind speed.[[BR]] 39 40 For 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-interimproducts 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).41 Water 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). 41 42 42 43 When 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.