Production Approach

ATMOSPHERE

Figure 12.A.3 System boundary of the Production Approach.

Note: NEE = net ecosystem exchange of carbon, Edom = carbon release to the atmosphere from the pools of domestically grown HWP in use and in SWDS, EIM = carbon release to the atmosphere from the pools of imported HWP in use and in SWDS, Eex dom = carbon release to the atmosphere from the pools of domestically grown but exported HWP in use and in SWDS, H = carbon transfer in the form of harvested wood biomass transported from harvest sites, PEX = carbon transfer in the form of HWP exports, PIM = carbon transfer in the form off HWP imports, O = possible other cross-border carbon transfers from rest of AFOLU (assumed zero here). Note: Only those HWP in the export markets that are produced from domestic roundwood are within the system boundary, not those only processed in the reporting country but made from imported roundwood. The transfer PEX can in principle include both.

The Production Approach (PA) estimates changes in carbon stocks in the forest pool (and other wood producing lands) of the reporting country and the wood products pool containing products made from wood harvested in the reporting country. The wood products pool includes products made from domestic harvest that are be exported and stored in uses in other countries. This approach inventories carbon in wood products from domestically harvested wood only and does not provide a complete inventory of wood carbon in national stocks. Because some of the stock changes reported by a country may occur in other countries (where exports are held), the stock change report indicates when changes occur but not where they occur.

The system boundary of the Production Approach and the carbon pools under consideration are shown in Figure 12A.3. The national carbon dioxide emissions are approximated using Equation 12A.5:

Figure 12A.3 may be used to express Equations 12A.5 and 12A.6 using either carbon stock change and carbon transfer variables (AChwp iu^tt, AChwp swds^tt) or carbon release variables and carbon transfer variables ( tCHWP

DH DH

dh, H). Where variables AChwp iudh and AChwp swdsdh are defined in Table 12.1 and |Chwp dh = Edom + Eex

Figure 12A.3 may be used to express Equations 12A.5 and 12A.6 using either carbon stock change and carbon transfer variables (AChwp iu^tt, AChwp swds^tt) or carbon release variables and carbon transfer variables ( tCHWP

DH DH

dh, H). Where variables AChwp iudh and AChwp swdsdh are defined in Table 12.1 and |Chwp dh = Edom + Eex

As the quantity = -44/12 • A(AFOLU without HWP) is reported in the rest of AFOLU, the HWP Contribution to be reported in the HWP module is given by Equation 12A.6:

Equation 12A.6 Production Approach: HWP Contribution

HWP Contribution to AFOLU Net CO2 emissions PA = -44/12 • [ACHWP ro + ACHWP swD^„]

DH DH

HWP Contribution to AFOLU Net CO2 emissions PA = -44/12 • [H - |CHWP DH]

In the specific case when stock change of carbon in the above HWP pools is zero, and the HWP Contribution to net CO2 emissions HWP is reported as zero (Equation 12A.6).

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