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Impact of residential wood combustion on urban air quality
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wood combustion is mainly used in cold regions as a primary or supplemental space heating source in residential areas. In several industrialized countries, there is a renewed interest in residential wood combustion (RWC) as an alternative to fossil fuel and nuclear power consumption. The main objective of this thesis was to investigate the impact of RWC on the air quality in urban areas. To this end, a field campaign was conducted in Northern Sweden during wintertime to characterize atmospheric aerosol particles and polycyclic aromatic hydrocarbons (PAH) and to determine their source apportionment.

A large day-to-day and hour-to-hour variability in aerosol concentrations was observed during the intensive field campaign. On average, total carbon contributed a substantial fraction of PM10 mass concentrations (46%) and aerosol particles were mostly in the fine fraction (PM1 accounted for 76% of PM10). Evening aerosol concentrations were significantly higher on weekends than on weekdays which could be associated to the use of wood burning for recreational purposes or higher space heat demand when inhabitants spend longer time at home. It has been shown that continuous aerosol particle number size distribution measurements successfully provided source apportionment of atmospheric aerosol with high temporal resolution. The first compound-specific radiocarbon analysis (CSRA) of atmospheric PAH demonstrated its potential to provide quantitative information on the RWC contribution to individual PAH. RWC accounted for a large fraction of particle number concentrations in the size range 25-606 nm (44-57%), PM10 (36-82%), PM1 (31-83%), light-absorbing carbon (40-76%) and individual PAH (71-87%) mass concentrations.

These studies have demonstrated that the impact of RWC on air quality in an urban location can be very important and largely exceed the contribution of vehicle emissions during winter, particularly under very stable atmospheric conditions.

Place, publisher, year, edition, pages
Stockholm: Institutionen för tillämpad miljövetenskap (ITM) , 2008. , 40 p.
Keyword [en]
residential wood combustion, air quality, aerosols, black carbon, polycyclic aromatic hydrocarbons, particulate matter, particle size distributions, source apportionment, positive matrix factorization, compound-specific radiocarbon analysis
National Category
Earth and Related Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-7682ISBN: 978-91-7155-608-0 (print)OAI: oai:DiVA.org:su-7682DiVA: diva2:198830
Public defence
2008-06-04, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 13:00
Opponent
Supervisors
Available from: 2008-05-14 Created: 2008-05-09Bibliographically approved
List of papers
1. Carbon content of atmospheric aerosol in a residential area during the wood combustion season in Sweden
Open this publication in new window or tab >>Carbon content of atmospheric aerosol in a residential area during the wood combustion season in Sweden
2007 In: Atmospheric Environment, ISSN 1352-2310, Vol. 41, no 33, 6974-6985 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25066 (URN)000250933800006 ()
Note
Part of urn:nbn:se:su:diva-7682Available from: 2008-05-14 Created: 2008-05-09Bibliographically approved
2. Diurnal variation of atmospheric aerosol during the wood combustion season in Northern Sweden
Open this publication in new window or tab >>Diurnal variation of atmospheric aerosol during the wood combustion season in Northern Sweden
2008 (English)In: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 42, no 18, 4113-4125 p.Article in journal (Refereed) Published
Abstract [en]

A set of aerosol measurements was conducted in the residential area of Forsdala in Lycksele, Northern Sweden, during winter 2005/2006. This article describes the temporal and diurnal variation of the aerosol physical properties (concentrations of PM10, PM1, light-absorbing carbon, and particle number, and number size distributions), and the relationship among aerosol concentrations and meteorological variables. A large day-to-day and hour-to-hour variability in aerosol concentrations was observed during the intensive study period. Evening aerosol concentrations were statistically significantly higher on weekends than on weekdays. On weekdays, particle size distribution and concentrations varied diurnally with small particles (diameter <30 nm) associated mainly with morning motor vehicle emissions. The results suggest that a combination of emissions from residential wood combustion and traffic sources might explain the high evening concentrations of PM10, PM1, particle number, and light-absorbing carbon as well as large geometric mean diameters observed during weekdays and weekends. Strong correlations of PM10 and PM1 with particle size distributions are found in the diameter range 130–500 nm and are remarkably high on weekend evenings when larger particles are sampled. The correlation between light-absorbing carbon mass concentration and particle size distribution is high regarding both particle number and mass for particle diameters >95 nm. High aerosol concentrations were associated with low air temperatures and very stable atmospheric conditions close to the ground.

Keyword
Residential wood combustion, Black carbon, Particle size distribution, PM10, PM1
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:su:diva-25067 (URN)10.1016/j.atmosenv.2008.01.026 (DOI)000257498700008 ()
Available from: 2008-05-14 Created: 2008-05-09 Last updated: 2017-12-13Bibliographically approved
3. Contribution of residential wood combustion to hourly winter aerosol in Northern Sweden determined by positive matrix factorization
Open this publication in new window or tab >>Contribution of residential wood combustion to hourly winter aerosol in Northern Sweden determined by positive matrix factorization
2008 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 8, no 13, 3639-3653 p.Article in journal (Refereed) Published
Abstract [en]

The combined effect of residential wood combustion (RWC) emissions with stable atmospheric conditions. which frequently occurs in Northern Sweden during wintertime, can deteriorate the air quality even in small towns. To estimate the contribution of RWC to the total atmospheric aerosol loading, positive matrix factorization (PMF) was applied to hourly mean particle number size distributions measured in a residential area in Lycksele during winter 2005/2006. The sources were identified based on the particle number size distribution profiles of the PMF factors., the diurnal contributions patterns estimated by PMF for both weekends and weekdays, and correlation of the modeled particle number concentration per factor with measured aerosol mass concentrations (PM10, PM1, and light-absorbing carbon M-LAC). Through these analyses. the factors were identified as local traffic (factor 1), local RWC (factor 2), and local RWC plus Ion-range transport (LRT) of aerosols (factor 3). In some occasions, the PMF model could not separate the contributions of local RWC from background concentrations since their particle number size distributions partially overlapped. As a consequence, we report the contribution of RWC as a range of values, being the minimum determined by factor 2 and the possible maximum as the contributions of both factors 2 and 3. A multiple linear regression (MLR) of observed PM10, PM1, total particle number, and M-LAC concentrations is carried out to determine the source contribution to these aerosol variables. The results reveal RWC is an important source of atmospheric particles in the size range 25-606 nm (44-57%), PM10 (36-82%), PM1 (31-83%), and M-LAC (40-76%) mass concentrations in the winter season.

National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:su:diva-25068 (URN)10.5194/acp-8-3639-2008 (DOI)000257516800016 ()
Available from: 2008-05-14 Created: 2008-05-09 Last updated: 2017-12-13Bibliographically approved
4. Source apportionment of elevated wintertime PAH in a Northern Swedish town by compound specific radiocarbon analysis
Open this publication in new window or tab >>Source apportionment of elevated wintertime PAH in a Northern Swedish town by compound specific radiocarbon analysis
Show others...
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-25069 (URN)
Note
Part of urn:nbn:se:su:diva-7682Available from: 2008-05-14 Created: 2008-05-09 Last updated: 2010-01-13Bibliographically approved

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