Level

Under Level 2, country-specific emission factors are used to estimate CO2 diffusive emissions. In Level 2, CO2 emissions can be estimated from reservoirs following the approach shown in Equation 2a.2. As with Level 1, the CO2 emissions from Land Converted to Flooded Land should be estimated only for ten years after flooding when using Level 2 method unless country-specific research indicates otherwise.

The estimation of diffusive emissions can also be extended to distinguish between periods in which the reservoirs are ice-free and those in which they are ice-covered (Duchemin et al., 2006). This may be a significant improvement in accuracy for countries in colder climates. The flooded land area may be further disaggregated by climatic zone, geological basement, or any relevant parameter listed in Box 2a.1.

Equation 2a.2

CO2 EMISSIONS FROM LAND CONVERTED TO FLOODED LAND (LEVEL 2)

C02 EmissionsLWflood

Where:

CO2 emissionsLW food = total CO2 emissions from Land Converted to Flooded Land, Gg CO2 yr-1

Pf = ice-free period, days yr-1

Pi = period with ice cover, days yr-1

Ef(CO2)diff = averaged daily diffusive emissions from air water-interface during the ice-free period, kg CO2 ha-1 day-1

E(CO2)diff = diffusive emissions related to the ice-covered period, kg CO2 ha-1 day-1 Aflood, surface= total reservoir surface area, including flooded land, lakes and rivers, ha fA = fraction of the total area flooded within the last 10 yrs, dimensionless

Figure 2a.1 Flow Chart for selection of appropriate level

Figure 2a.1 Flow Chart for selection of appropriate level

Note:

1: See Volume 1 Chapter 4, "Methodological Choice and Identification of Key Categories" (noting Section 4.1.2 on limited resources), for discussion of key categories and use of decision trees.

2: A subcategory is significant if it accounts for 25-30% of emissions/removals for the overall category.

Level 3

The Level 3 methods for estimating CO2 emissions are comprehensive and must include additional country-specific data on all relevant CO2 emission pathways, such as degassing emissions. Emission factors are disaggregated to reflect all relevant sources of temporal and spatial variability (see Box 2a.1). To avoid double counting, Level 3 also requires partitioning emissions from the degradation of flooded organic matter and from the decay of organic matter originating from the watershed.

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