Use of Models and Facility-Level Data in Greenhouse Gas Inventories
Use of Models and Facility-Level Data in Greenhouse Gas Inventories
Use of Models and Facility-Level Data in Greenhouse Gas Inventories
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<strong>Use</strong> <strong>of</strong> <strong>Models</strong> <strong>and</strong> <strong>Facility</strong>-<strong>Level</strong> <strong>Data</strong> <strong>in</strong> <strong>Greenhouse</strong> <strong>Gas</strong> <strong>Inventories</strong><br />
Comparison <strong>of</strong> model parameters with field <strong>in</strong>vestigations<br />
The parameters that were obta<strong>in</strong>ed from error function analysis <strong>and</strong> <strong>in</strong>formation from each study site based on<br />
<strong>in</strong>formation at each site <strong>in</strong>clud<strong>in</strong>g waste composition, waste <strong>in</strong> place, history <strong>and</strong> operation practice were used to<br />
calculate methane emissions <strong>in</strong> the IPCC Waste Model aga<strong>in</strong>. Total methane emissions were calculated by summariz<strong>in</strong>g<br />
seasonal emissions that was calculated by multiply<strong>in</strong>g daily methane emission <strong>in</strong> each season with the period <strong>of</strong> the<br />
season. The calculation results <strong>and</strong> field measurements <strong>of</strong> methane emissions at all sites are summarized <strong>in</strong> Table 3.<br />
The comparison results show that the methane emissions from the IPCC Waste Model gave fair results compared to<br />
field measurements <strong>in</strong> both cases <strong>of</strong> managed <strong>and</strong> unmanaged l<strong>and</strong>fills as seen <strong>in</strong> Figure 5 with the R 2 <strong>of</strong> 0.65. The<br />
differences between calculations <strong>and</strong> field measurements at the MD1, MD2, MD4 <strong>and</strong> MS1 were -2.53%, 16.50%, -<br />
11.08% <strong>and</strong> -7.11%, respectively. At MD3, the calculated value was about 65.51% lower than field measurement. This<br />
big difference may be caused by the uncerta<strong>in</strong>ty <strong>of</strong> waste loaded to the site deal<strong>in</strong>g with MSW <strong>and</strong> other non-hazardous<br />
waste from <strong>in</strong>dustry while the <strong>in</strong>put parameter used <strong>in</strong> IPCC Waste Model was only MSW composition because <strong>of</strong> the<br />
lack <strong>of</strong> non-hazardous waste compositions data.<br />
However, the calculations <strong>of</strong> methane emission from dumpsite were close to field <strong>in</strong>vestigations <strong>in</strong> the cases <strong>of</strong> US <strong>and</strong><br />
UD2 revealed by a very low error. At UD3 <strong>and</strong> UD1, errors <strong>of</strong> estimation amount to about 50%. These errors may be<br />
caused by <strong>in</strong>correct data <strong>of</strong> waste quantity because some parts <strong>of</strong> waste were moved to other l<strong>and</strong>fills <strong>in</strong> the case <strong>of</strong><br />
UD3. At UD1, the quantity <strong>of</strong> waste was estimated by base on waste delivery vehicle capacity, uncerta<strong>in</strong>ty is higher <strong>and</strong><br />
may effects to emission <strong>in</strong>ventory.<br />
Table 3 Comparison <strong>of</strong> methane emissions <strong>in</strong> 2006 (Mg) from FOD model <strong>and</strong> field measurements<br />
Site<br />
MD1<br />
MD2<br />
MD3<br />
MD4<br />
MS1<br />
UD1<br />
UD2<br />
UD3<br />
US1<br />
Operation<br />
practice<br />
Managed – deep<br />
(Active)<br />
Managed - deep<br />
(Active)<br />
Managed - deep<br />
(Active)<br />
Managed - deep<br />
(Active)<br />
Managed –<br />
shallow (Active)<br />
unmanaged -<br />
deep (Active)<br />
unmanaged -<br />
deep (Active)<br />
unmanaged -<br />
deep (Inactive)<br />
unmanaged -<br />
shallow (Active)<br />
Default<br />
MCF<br />
Selected<br />
MCF<br />
Default<br />
OX<br />
Selected<br />
OX<br />
IPCC<br />
Waste<br />
Model<br />
Field<br />
measurement<br />
1.00 0.65 0.10 0.15 1,523.30 1,485.75 -2.53%<br />
1.00 0.65 0.10 0.15 127.76 153.01 16.50%<br />
1.00 0.65 0.10 0.15 715.62 2,074.87 65.51%<br />
1.00 0.65 0.10 0.15 420.11 378.21 -11.08%<br />
1.00 0.2 0.10 0.15 60.07 56.08 -7.11%<br />
0.80 0.15 0.10 0.70 42.45 73.89 42.55%<br />
0.80 0.15 0.10 0.70 106.12 106.52 0.37%<br />
0.80 0.15 0.10 0.70 97.67 63.26 -54.39%<br />
0.40 0.1 0.10 0.70 20.60 20.65 0.25%<br />
Diff.<br />
IPCC Expert Meet<strong>in</strong>g Report 60 TFI