DOI: 10.1002/grl.50343
论文题名: Observations of a seasonal cycle in NOx emissions from fires in African woody savannas
作者: Mebust A.K. ; Cohen R.C.
刊名: Geophysical Research Letters
ISSN: 0094-9199
EISSN: 1944-8930
出版年: 2013
卷: 40, 期: 7 起始页码: 1451
结束页码: 1455
语种: 英语
英文关键词: African savanna
; biomass burning
; Moderate Resolution Imaging Spectroradiometer (MODIS)
; nitrogen
; NOx emissions
; Ozone Monitoring Instrument (OMI)
Scopus关键词: African savanna
; Biomass-burning
; Combustion efficiencies
; Earth's radiative balance
; Moderate resolution imaging spectroradiometer
; Ozone monitoring instruments
; Satellite observations
; Smoldering combustion
; Biomass
; Nitrogen
; Nitrogen oxides
; Radiometers
; Satellite imagery
; Fires
; atmosphere-biosphere interaction
; atmospheric pollution
; biogenic emission
; biomass burning
; combustion
; fire behavior
; methane
; MODIS
; nitrogen oxides
; ozone
; radiation balance
; satellite imagery
; savanna
; seasonal variation
; seasonality
; wildfire
; Africa
英文摘要: Nitrogen oxide (NOx) emissions from wildfires account for ~15% of the global total, inducing large fluctuations in the chemical production and loss rates of O3 and CH4 and thereby affecting Earth's radiative balance. NOx emissions from fires depend on fuel nitrogen (N) content, the relative contributions of flaming and smoldering combustion, and total biomass burned. Current understanding of the variability in these factors across biomes is limited by sparse observations. Here we use satellite-based measurements to study emission coefficients (ECs), a value proportional to NOx emitted per unit of biomass burned, from fires in African savannas. We show that ECs for NOx exhibit a pronounced seasonal cycle in woody savannas, with early-season ECs 20-40% above and late-season ECs 30-40% below the mean, while no cycle exists in nonwoody savannas. We discuss several possible mechanisms of the observed cycle including seasonal differences in fuel N content and modified combustion efficiency. Key Points Satellite observations are used to quantify fire emissions of NOx NOx emission factors for African woody savanna fires vary seasonally This may result from seasonal differences in MCE or plant nitrogen ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876932795&doi=10.1002%2fgrl.50343&partnerID=40&md5=cd76e3c0b7c1bc6da73a3c5feb7e6219
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6463
Appears in Collections: 气候减缓与适应
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作者单位: Department of Chemistry, University of California, College of Chemistry, Berkeley, CA 94720-1460, United States
Recommended Citation:
Mebust A.K.,Cohen R.C.. Observations of a seasonal cycle in NOx emissions from fires in African woody savannas[J]. Geophysical Research Letters,2013-01-01,40(7).