Carbon balance indicator for forest bioenergy scenarios
| Autor: | Tuomas Helin, Tommi Ekholm, Kim Pingoud, Sampo Soimakallio |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
010504 meteorology & atmospheric sciences
Forest management Biomass 010501 environmental sciences system boundaries Atmospheric sciences 01 natural sciences chemistry.chemical_compound landscape level Bioenergy forest harvest residues steady-state Waste Management and Disposal ta218 carbon debt SDG 15 - Life on Land 0105 earth and related environmental sciences Renewable Energy Sustainability and the Environment business.industry Agroforestry Fossil fuel carbon neutrality Forestry dynamics timing of emissions baseline Carbon neutrality chemistry Greenhouse gas Carbon dioxide ta1181 Environmental science Sink (computing) biomass emission factor business Agronomy and Crop Science |
| Zdroj: | Pingoud, K, Ekholm, T, Soimakallio, S & Helin, T 2016, ' Carbon balance indicator for forest bioenergy scenarios ', Global Change Biology: Bioenergy, vol. 8, no. 1, pp. 171-182 . https://doi.org/10.1111/gcbb.12253 |
| ISSN: | 1757-1693 |
| DOI: | 10.1111/gcbb.12253 |
| Popis: | A carbon (C) balance indicator is presented for the evaluation of forest bioenergy scenarios as a means to reduce greenhouse gas (GHG) emissions. A bioenergy-intensive scenario with a greater harvest is compared to a baseline scenario. The relative carbon indicator (RC) is defined as the ratio between the difference in terrestrial C stocks - i.e. the C debt - and the difference in cumulative bioenergy harvest between the scenarios, over a selected timeframe T. A value of zero indicates no C debt from additional biomass harvests, while a value of one indicates a C debt equal to the amount of additionally harvested biomass C. Multiplying the RC indicator by the smokestack emission factor of biomass (approximately 110 t CO2/TJ) provides the net cumulative CO2 emission factor of the biomass combustion as a function of T, allowing a direct comparison with the emission factors of comparable fossil fuels. Using the data of Asikainen et al. (2012), Sievänen et al. (2014) and Repo et al. (2012), the indicator is applied to bioenergy cases in Finland, where typically the rotation length of managed forests is long and the decay rate of harvest residues is slow. The country-level examples illustrate that although Finnish forests remain as a C sink in each of the scenarios considered, the efforts of increasing forest bioenergy may still increase the atmospheric CO2 concentrations in comparison with the baseline scenario and use of fossil fuels. The results also show that the net emission factor depends - besides on forest-growth or residue-decay dynamics - on the timing and evolution of harvests as well. Unlike for the constant fossil C emission factor, the temporal profile of bioenergy use is of great importance for the net emission factor of biomass. |
| Databáze: | OpenAIRE |
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