DOI: 10.1002/2016JD025216
论文题名: Investigating dominant characteristics of fires across the Amazon during 2005–2014 through satellite data synthesis of combustion signatures
作者: Tang W. ; Arellano A.F. ; Jr.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 2 起始页码: 1224
结束页码: 1245
语种: 英语
英文关键词: combustion efficiency
; fires in the Amazon
; MODIS AOD
; MOPITT CO
; OMI NO2
; satellite retrievals
Scopus关键词: aerosol property
; carbon monoxide
; combustion
; emission
; emission inventory
; fire
; MODIS
; MOPITT
; nitrous oxide
; optical depth
; satellite data
; smoke
; Amazonia
英文摘要: Estimates of fire emissions remain uncertain due to limited constraints on the variations in fire characteristics. Here we demonstrate the utility of space-based observations of smoke constituents in addressing this limitation. We introduce a satellite-derived smoke index (SI) as an indicator of the dominant phase of large-scale fires. This index is calculated as the ratio of the geometric mean of observed fractional enhancements (due to fire) in carbon monoxide and aerosol optical depth to that of nitrogen dioxide. We assess the usefulness of this index on fires in the Amazon. We analyze the seasonal, regional, and interannual joint distribution of SI and fire radiative power (FRP) in relation to fire hotspots, land cover, Drought Severity Index, and deforestation rate estimates. We also compare this index with an analogous quantity derived from field data or emission inventories. Our results show that SI changes from low (more flaming) to high (more smoldering) during the course of a fire season, which is consistent with the changes in observed maximum FRPs from high to low. We also find that flaming combustion is more dominant in areas where deforestation fires dominate, while smoldering combustion has a larger influence during drought years when understory fires are more likely enhanced. Lastly, we find that the spatiotemporal variation in SI is inconsistent with current emission inventories. Although we recognize some limitations of this approach, our results point to the utility of SI as a proxy for overall combustion efficiency in the parameterization of fire emission models. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: NNX14AN47G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62740
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Tang W.,Arellano A.F.,Jr.. Investigating dominant characteristics of fires across the Amazon during 2005–2014 through satellite data synthesis of combustion signatures[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)