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  2. Continuous Satellite-derived Global Record of Monthly Land Surface Evapotranspiration (1983-2006)

The objective of this study was to generate a global long-term (1983-2006) daily ET record with well quantified accuracy for studies on regional/global water balances changes. We applied a satellite remote sensing based evapotranspiration (ET) algorithm to assess global terrestrial ET. The algorithm quantifies canopy transpiration and soil evaporation using a modified Penman-Monteith approach with biome-specific canopy conductance determined from the NDVI, and quantifies open water evaporation using a Priestley-Taylor approach. These algorithms were applied globally using AVHRR GIMMS NDVI, NCEP/NCAR Reanalysis (NNR) daily surface meteorology and NASA/GEWEX Surface Radiation Budget (SRB) Release-3.0 solar radiation inputs. We used observations from FLUXNET tower sites representative of the major global vegetation types to parameterize an NDVI-based canopy conductance model and then validated the global ET algorithm using measurements from additional, independent flux towers. The global ET results capture observed spatial and temporal variations at the global scale and also compare favorably (RMSE=186.3 mm yr-1; R2=0.80) with ET inferred from basin-scale water balance calculations. These data provide a relatively long term global ET record with well-quantified accuracy for assessing ET climatologies, terrestrial water and energy budgets and long-term water cycle changes.

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Use the links in the table below to view and download data using WCS.

This data set contains 48 data granules
Granule Name Variables Metadata Preview Image
    Global Land Surface Monthly Evapotranspiration for 1983 at 1 Degree Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 90, S: -90, E: 180, W: -180
Start DateTime: 1983-01-01
End DateTime: 1983-12-31
Global Land Surface Monthly Evapotranspiration for 1983 at 1 Degree Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1983 at 8km Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 89.22, S: -62.85, E: 180, W: -180
Start DateTime: 1983-01-01
End DateTime: 1983-12-31
Global Land Surface Monthly Evapotranspiration for 1983 at 8km Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1984 at 1 Degree Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 90, S: -90, E: 180, W: -180
Start DateTime: 1984-01-01
End DateTime: 1984-12-31
Global Land Surface Monthly Evapotranspiration for 1984 at 1 Degree Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1984 at 8km Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 89.22, S: -62.85, E: 180, W: -180
Start DateTime: 1984-01-01
End DateTime: 1984-12-31
Global Land Surface Monthly Evapotranspiration for 1984 at 8km Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1985 at 1 Degree Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 90, S: -90, E: 180, W: -180
Start DateTime: 1985-01-01
End DateTime: 1985-12-31
Global Land Surface Monthly Evapotranspiration for 1985 at 1 Degree Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1985 at 8km Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 89.22, S: -62.85, E: 180, W: -180
Start DateTime: 1985-01-01
End DateTime: 1985-12-31
Global Land Surface Monthly Evapotranspiration for 1985 at 8km Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1986 at 1 Degree Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 90, S: -90, E: 180, W: -180
Start DateTime: 1986-01-01
End DateTime: 1986-12-31
Global Land Surface Monthly Evapotranspiration for 1986 at 1 Degree Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1986 at 8km Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 89.22, S: -62.85, E: 180, W: -180
Start DateTime: 1986-01-01
End DateTime: 1986-12-31
Global Land Surface Monthly Evapotranspiration for 1986 at 8km Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1987 at 1 Degree Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 90, S: -90, E: 180, W: -180
Start DateTime: 1987-01-01
End DateTime: 1987-12-31
Global Land Surface Monthly Evapotranspiration for 1987 at 1 Degree Resolution
 
    Global Land Surface Monthly Evapotranspiration for 1987 at 8km Resolution evapotranspiration Projection: WGS 84
Spatial Extent: N: 89.22, S: -62.85, E: 180, W: -180
Start DateTime: 1987-01-01
End DateTime: 1987-12-31
Global Land Surface Monthly Evapotranspiration for 1987 at 8km Resolution