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  2. NACP Model Driver Data: North America Grassland C3 and C4 maps 0.25-degree

Photosynthesis can vary significantly between species using the two major photosynthetic pathways, most terrestrial biosphere models (TBMs) use separate algorithms for estimating gross primary productivity (GPP) of C3 and C4 plant types. In order to provide the required spatial distribution of ecosystems dominated each of these pathways, we used an approach described in Still et al. (2003) based on growing season temperature. Since the C4 pathway is largely found in warm season grass species we created a North American 0.25-degree resolution map of the relative fraction of C3 and C4 grasses using the “present” climate state based on the North American Regional Reanalysis (NARR) mean monthly precipitation and temperature data for 2000-2010. For grid cells characterized as grasslands (or containing grasslands) the relative fraction map defines the fraction of those grasses that are C3 or C4, so that in each grid cell the C3 and C4 grass fractions sum to one regardless of the total percentage of grassland contained in the grid cell.

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

This data set contains 6 data granules
Granule Name Variables Metadata Preview Image
    NACP SYNMAP North America C3 and C4 maps 0.25-degree: potential relative fraction of C3 grasses grasses Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
NACP SYNMAP North America C3 and C4 maps 0.25-degree:  potential relative fraction of C3 grasses
 
    NACP SYNMAP North America C3 and C4 maps 0.25-degree: potential relative fraction of C4 grasses grasses Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
NACP SYNMAP North America C3 and C4 maps 0.25-degree:  potential relative fraction of C4 grasses
 
    NACP SYNMAP North America C3 and C4 maps 0.25-degree: potential relative fraction of grasses grasses Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
NACP SYNMAP North America C3 and C4 maps 0.25-degree:  potential relative fraction of grasses
 
    NACP SYNMAP North America C3 and C4 maps 0.25-degree: present relative fraction of C3 grasses grasses Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
NACP SYNMAP North America C3 and C4 maps 0.25-degree:  present relative fraction of C3 grasses
 
    NACP SYNMAP North America C3 and C4 maps 0.25-degree: present relative fraction of C4 grasses grasses Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
NACP SYNMAP North America C3 and C4 maps 0.25-degree:  present relative fraction of C4 grasses
 
    NACP SYNMAP North America C3 and C4 maps 0.25-degree: SYNMAP_PRESENTVEG_Grassland_Fractio grasses Projection: WGS 84
Spatial Extent: N: 84, S: 10, E: -50, W: -170
Start DateTime: N/A
End DateTime: N/A
NACP SYNMAP North America C3 and C4 maps 0.25-degree:  SYNMAP_PRESENTVEG_Grassland_Fractio