The time aspect of bioenergy - Climate impacts of solid biofuels due to biogenic carbon dynamics
(2014) In Global Change Biology Bioenergy Epub ahead of print.- Abstract
- The climate impacts from bioenergy involve an important time aspect. Using forest residues for energy may result in high initial emissions, but net emissions are reduced over time since, if the residues were left on the ground, they would decompose and release CO2 to the atmosphere. This article investigates the climate impacts from bioenergy with special focus on the time aspects. More specifically, we analyze the climate impacts of forest residues and stumps where combustion related emissions are compensated by avoided emissions from leaving them on the ground to decompose. These biofuels are compared with fossil gas and coal. Net emissions are defined as emissions from utilizing the fuel minus emissions from a reference case of no... (More)
- The climate impacts from bioenergy involve an important time aspect. Using forest residues for energy may result in high initial emissions, but net emissions are reduced over time since, if the residues were left on the ground, they would decompose and release CO2 to the atmosphere. This article investigates the climate impacts from bioenergy with special focus on the time aspects. More specifically, we analyze the climate impacts of forest residues and stumps where combustion related emissions are compensated by avoided emissions from leaving them on the ground to decompose. These biofuels are compared with fossil gas and coal. Net emissions are defined as emissions from utilizing the fuel minus emissions from a reference case of no utilization. Climate impacts are estimated using the measures radiative forcing and global average surface temperature. We find that the climate impacts from using forest residues and stumps depend on the decomposition rates and the time perspective over which the analysis is done. Over a 100 year perspective, branches and tops have lower climate impacts than stumps which in turn have lower impacts than fossil gas and coal. Over a 20 year time perspective, branches and tops have lower climate impacts than all other fuels but the relative difference is smaller. However, stumps have slightly higher climate impacts over 20 years than fossil gas but lower impacts than coal. Regarding metrics for climate impacts, over shorter time scales, approximately 30 years or less, radiative forcing overestimates the climate impacts compared with impacts expressed by global surface temperature change, which is due to the inertia of the climate system. We also find that establishing willow on earlier crop land may reduce atmospheric CO2, provided new land is available. However, these results are inconclusive since we haven't considered the effects of producing the agricultural crops elsewhere. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7515635
- author
- Zetterberg, Lars and Chen, Deliang
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- bioenergy, climate impacts, forest residues, global average surface temperature, radiative forcing, stumps, time aspects, willow
- in
- Global Change Biology Bioenergy
- volume
- Epub ahead of print
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:84931028660
- ISSN
- 1757-1693
- DOI
- 10.1111/gcbb.12174
- language
- English
- LU publication?
- no
- id
- beb6e669-ddcc-4110-ac7a-31eb1a4c6456 (old id 7515635)
- date added to LUP
- 2016-04-04 08:36:28
- date last changed
- 2022-01-29 03:42:57
@article{beb6e669-ddcc-4110-ac7a-31eb1a4c6456,
abstract = {{The climate impacts from bioenergy involve an important time aspect. Using forest residues for energy may result in high initial emissions, but net emissions are reduced over time since, if the residues were left on the ground, they would decompose and release CO2 to the atmosphere. This article investigates the climate impacts from bioenergy with special focus on the time aspects. More specifically, we analyze the climate impacts of forest residues and stumps where combustion related emissions are compensated by avoided emissions from leaving them on the ground to decompose. These biofuels are compared with fossil gas and coal. Net emissions are defined as emissions from utilizing the fuel minus emissions from a reference case of no utilization. Climate impacts are estimated using the measures radiative forcing and global average surface temperature. We find that the climate impacts from using forest residues and stumps depend on the decomposition rates and the time perspective over which the analysis is done. Over a 100 year perspective, branches and tops have lower climate impacts than stumps which in turn have lower impacts than fossil gas and coal. Over a 20 year time perspective, branches and tops have lower climate impacts than all other fuels but the relative difference is smaller. However, stumps have slightly higher climate impacts over 20 years than fossil gas but lower impacts than coal. Regarding metrics for climate impacts, over shorter time scales, approximately 30 years or less, radiative forcing overestimates the climate impacts compared with impacts expressed by global surface temperature change, which is due to the inertia of the climate system. We also find that establishing willow on earlier crop land may reduce atmospheric CO2, provided new land is available. However, these results are inconclusive since we haven't considered the effects of producing the agricultural crops elsewhere.}},
author = {{Zetterberg, Lars and Chen, Deliang}},
issn = {{1757-1693}},
keywords = {{bioenergy; climate impacts; forest residues; global average surface temperature; radiative forcing; stumps; time aspects; willow}},
language = {{eng}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Global Change Biology Bioenergy}},
title = {{The time aspect of bioenergy - Climate impacts of solid biofuels due to biogenic carbon dynamics}},
url = {{http://dx.doi.org/10.1111/gcbb.12174}},
doi = {{10.1111/gcbb.12174}},
volume = {{Epub ahead of print}},
year = {{2014}},
}