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Table 1 Variable definitions for the IPCC/EPA production accounting approach shown in Figure 2 [3]. Units for all variables are MgC yr-1.

From: Estimates of carbon stored in harvested wood products from the United States forest service northern region, 1906-2010

Variable Definition
ΔS Annual carbon stock change for the total forest sector, which is calculated as ΔS = (NEE-H)+(ΔC R1 ) in the production accounting approach.
NEE Annual net ecosystem carbon exchange, the annual net carbon that moves from the atmosphere to forests.
H Annual harvest of wood for products, which includes wood and residues removed from harvest sites, but excludes resides left at harvest sites.
HWP Harvested wood products in use or at solid waste disposal sites.
ER1 Annual emission of carbon to the atmosphere in the Northern Region from products made from wood harvested in the Northern Region.
EIM Annual emission of carbon to the atmosphere in the Northern Region from products made from wood harvested outside of the Northern Region and imported into The Northern Region.
PEX Annual exports of wood and paper products out of the Northern Region, including roundwood, chips, residue, pulp and recovered (recycled) products.
PIM Annual imports of wood and paper products into the Northern Region, including roundwood, chips, residue, pulp and recovered (recycled) products.
EEX R1 Annual emission of carbon to the atmosphere in areas outside of the Northern Region from products made from wood harvested in the Northern Region.
EOTHER Annual emission of carbon to the atmosphere in areas outside of the Northern Region from products made from wood harvested outside the Northern Region.
CR1 Stock of harvested wood products carbon in use or at solid waste disposal sites where products used wood from the Northern Region harvests.
ΔCIU R1 Annual change in carbon stored in harvested wood products in products in use where products used wood from the Northern Region harvests.
ΔCSWDS R1 Annual change in carbon stored in harvested wood products at solid waste disposal sites where products used wood from the Northern Region harvests.
ΔCR1 Annual change in carbon stored in harvested wood products in products in use and at solid waste disposal sites where products used wood from the Northern Region harvests.
ΔCR1 = ΔCIU R1 + ΔCSWDS R1