2005 Emission Inventory

2005 Emission Inventory

• Methodology
• Typologies of atmospheric pollutant sources
• Pollutants
• Aggregated pollution indicators
• Classification of activities (SNAP 97)
• "Top-Down" and "Bottom-Up"
• Spatial disaggregation of emissions
• Temporal modulation of emissions
• Data sources
• Emission factors
• Uncertainty
• Work in progress

Aggregated pollution indicators

In the Emission Inventory data for some aggregated pollution indicators are available, obtained from combination of the emission data of single pollutants.

• CO₂eq: total emissions of greenhouse gases expressed as CO₂ - equivalent
• Tot. acidif. (H+): total emissions of acidifying substances
• Precurs. O₃: total emissions of ozone precursors

CO₂eq: total emissions of greenhouse gases expressed as CO₂ - equivalent

"CO₂eq" emissions represent total emissions of greenhouse gases, weighted basing on their own contributions to greenhouse gas effect.

The estimate of greenhouse gases aggregated emissions is based on the following relation:

CO₂eq = Σ_iGWP_i x E_i

where

CO₂eq = CO₂ equivalent emissions in kt/year

GWP_i = "Global Warming Potential", IPCC coefficients equal to 1, 0.021 and 0.31 respectively for CO₂, CH₄ and N₂O (IPCC, 2001)

E_i = CO₂ (in kt/y), CH₄ and N₂O (in t/y) emissions.

Example:

If CO₂ emissions are 100 kt/y, CH₄ emissions 50 are t/y and N₂O emissions are 10 t/y, then CO₂eq emissions are:

CO₂eq = 100 * 1 kt/y + 0.021 * 50 kt/y + 10 * 0.31 kt/y = 104.2 kt/y.

Tot. acidif. (H+): total emissions of acidifying substances

"Tot. acidif. (H+)" emissions represent total emissions of substances able to contribute to rain acidification.

The estimate of aggregated emissions of acidifying substances is based on the following relation:

Tot.acidif. (H+) = Σ_i AP_i x E_i /1000

where

Tot. acidif. (H+) = total emissions of acidifying substances expressed as kt/y of H+ equivalents

AP_i = acidifying potential factors, equal to 31.25, 21.74 and 58.82 respectively for SO₂, NO_x and NH₃ (De Leeuw et al., 2002)

E_i = SO₂, NO_x and NH₃ (in t/y) emissions

Example

If SO₂ emissions are 10 t/y, N₂O emissions are 50 t/y, NH₃ emissions are 1 t/y, then Tot. acidif. (H+) emissions are:

Tot. acidif. (H+) = (31.25 * 10 t/y + 21.74 * 50 t/y + 58.82 * 1 t/y)/1000 = 1.46 kt/y.

Precurs. O₃: total emissions of ozone precursors

"Precurs. O₃" emissions represent total emissions of pollutant substances able to promote the formation of tropospheric ozone.

The estimate of aggregated emissions of ozone precursors is based on the following relation:

Precurs. O₃ = Σ_iTOPP_i x E_i

where

Precurs. O₃ = emission of ozone precursors in t/y

TOPP_i = "Tropospheric Ozone Formation Potentials", formation coefficients of tropospheric ozone, equal to 1.22, 1, 0.014 and 0.11 respectively for NO_x, VOC, CH₄ and CO (De Leeuw et al., 2002)

E_i = NO_x, VOC, CH₄ and CO emissions (in t/y).

Example

If NO_x emissions are 10 t/y, NMVOC emissions are 5 t/y, CH₄ emissions are 5 t/y and CO emissions are 50 t/y, then Precurs. O₃ emissions are:

Precurs. O₃ = 1.22 * 10 t/y + 1 * 5 t/y + 0.014 * 5 t/y + 0.11 * 50 t/y = 22.77 t/y.

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