Estimating Global Inventory-Based Net Carbon Exchange from Agricultural Lands for Use in the NASA Flux Pilot Study Julie Wolf, Yannick Le Page and Tris.

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Presentation transcript:

Estimating Global Inventory-Based Net Carbon Exchange from Agricultural Lands for Use in the NASA Flux Pilot Study Julie Wolf, Yannick Le Page and Tris West Joint Global Change Research Institute CMS 2014 Science Team Meeting

Objectives: Quantify global agricultural carbon fluxes:

Objectives: Quantify global agricultural carbon fluxes:  Above- and belowground crop biomass  Harvested and removed crop biomass  Crop residues left on field  Crop net primary productivity (NPP)  Livestock intake of crop harvests and crop residues  Livestock forage/grazing of non-crop carbon  Human intake of crop- and livestock-based food

Objectives: Quantify global agricultural carbon fluxes Quantify agricultural net carbon exchange (NCE) and construct carbon budget Distribute carbon fluxes at 0.05 degree scale for Estimate uncertainty for all carbon fluxes

Methods: Combine  Inventory data for crops, livestock, and human populations (1961 – 2011)  Carbon coefficients  Satellite-based land cover (2005 base year) to create spatially resolved estimates of NCE

Methods: NCE = -NPP + belowground biomass + residue + food intake + fodder intake (ignoring changes in soil carbon, eq. simplifies to)  NCE = -harvest + food intake + fodder intake

Methods: Spatial distribution: Crops – MODIS 500m landcover product (2005), cropland area reconciled to match reported harvested areas. Livestock – estimated area requirements for housed and free-ranging populations placed on grassland and shrubland; also on croplands in dense areas Humans – SEDAC 2005 Gridded Human Population of the World.

Methods: Uncertainty: Develop probability density functions for all coefficients, based on range in published values. Monte Carlo Analysis of complete mathematical model for each flux quantity.

Results: Crop harvest, NPP, and area

Results: Crop NPP spatial distribution

Results: Regional NCE and spatial distribution (NCE = -harvest + food intake + fodder intake)

Results: Global agricultural budget

Results: Global agricultural budget agricultural losses post-harvest losses food supply chain losses/waste

Results: Global agricultural budget Detailed livestock intake: crop residues primary harvest hay and fodder crops forage/grazing

Conclusions: Objectives completed Manuscript completed: “Biogenic carbon fluxes from global agricultural production and consumption” Data available include spatial distributions, coefficients developed, crop residue, livestock feed sources, and livestock manure production.

Thank you.