DOI: 10.1016/j.atmosenv.2014.09.058
Scopus记录号: 2-s2.0-84907703882
论文题名: Fire environment effects on particulate matter emission factors in southeastern U.S. pine-grasslands
作者: Robertson K ; M ; , Hsieh Y ; P ; , Bugna G ; C
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 99 起始页码: 104
结束页码: 111
语种: 英语
英文关键词: Biomass burning
; Combustion efficiency
; Fire behavior
; Prescribed fire
; Structural equation model
Scopus关键词: Biomass-burning
; Combustion efficiencies
; Fire behavior
; Prescribed fires
; Structural equation modeling
; fuel
; aerodynamics
; biomass
; estimation method
; grassland
; moisture content
; particle size
; particulate flux
; particulate matter
; seasonal variation
; Article
; biomass
; combustion
; environmental temperature
; fire
; grassland
; land use
; meteorology
; moisture
; particulate matter
; pine
; structural equation modeling
; summer
; United States
; vegetation
; winter
; Georgia
; United States
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Particulate matter (PM) emission factors (EFPM), which predict particulate emissions per biomass consumed, have a strong influence on event-based and regional PM emission estimates and inventories. PM<2.5μm aerodynamic diameter (PM2.5), regulated for its impacts to human health and visibility, is of special concern. Although wildland fires vary widely in their fuel conditions, meteorology, and fire behavior which might influence combustion reactions, the EFPM2.5 component of emission estimates is typically a constant for the region or general fuel type being assessed. The goal of this study was to use structural equation modeling (SEM) to identify and measure effects of fire environment variables on EFPM2.5 in U.S. pine-grasslands, which contribute disproportionately to total U.S. PM2.5 emissions. A hypothetical model was developed from past literature and tested using 41 prescribed burns in northern Florida and southern Georgia, USA with varying years since previous fire, season of burn, and fire direction of spread. Measurements focused on EFPM2.5 from flaming combustion, although a subset of data considered MCE and smoldering combustion. The final SEM after adjustment showed EFPM2.5 to be higher in burns conducted at higher ambient temperatures, corresponding to later dates during the period from winter to summer and increases in live herbaceous vegetation and ambient humidity, but not total fine fuel moisture content. Percentage of fine fuel composed of pine needles had the strongest positive effect on EFPM2.5, suggesting that pine timber stand volume may significantly influence PM2.5 emissions. Also, percentage of fine fuel composed of grass showed a negative effect on EFPM2.5, consistent with past studies. Results of the study suggest that timber thinning and frequent prescribed fire minimize EFPM2.5 and total PM2.5 emissions on a per burn basis, and that further development of PM emission models should consider adjusting EFPM2.5 as a function of common land use variables, including pine timber stocking, surface vegetation composition, fire frequency, and season of burn. © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80564
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Tall Timbers Research Station and Land Conservancy, 13093 Henry Beadel Drive, Tallahassee, FL, United States; Center for Water and Air Quality, College of Engineering Sciences, Technology and Agriculture, Florida A and M University, Tallahassee, FL, United States
Recommended Citation:
Robertson K,M,, Hsieh Y,et al. Fire environment effects on particulate matter emission factors in southeastern U.S. pine-grasslands[J]. Atmospheric Environment,2014-01-01,99