气候变化领域集成服务门户(CCPortal): The vertical distribution of biomass burning pollution over tropical South America from aircraft in situ measurements during SAMBBA

CCPortal

DOI	10.5194/acp-19-5771-2019
	The vertical distribution of biomass burning pollution over tropical South America from aircraft in situ measurements during SAMBBA
	Darbyshire E.; Morgan W.T.; Allan J.D.; Liu D.; Flynn M.J.; Dorsey J.R.; O'Shea S.J.; Lowe D.; Szpek K.; Marenco F.; Johnson B.T.; Bauguitte S.; Haywood J.M.; Brito J.F.; Artaxo P.; Longo K.M.; Coe H.
发表日期	2019
ISSN	16807316
起始页码	5771
结束页码	5790
卷号	19 期号:9
英文摘要	We examine processes driving the vertical distribution of biomass burning pollution following an integrated analysis of over 200 pollutant and meteorological profiles measured in situ during the South AMerican Biomass Burning Analysis (SAMBBA) field experiment. This study will aid future work examining the impact of biomass burning on weather, climate and air quality. During the dry season there were significant contrasts in the composition and vertical distribution of haze between western and eastern regions of tropical South America. Owing to an active or residual convective mixing layer, the aerosol abundance was similar from the surface to ĝ1/41.5 km in the west and ĝ1/43 km in the east. Black carbon mass loadings were double as much in the east (1.7 μg mĝ'3) than the west (0.85 μg mĝ'3), but aerosol scattering coefficients at 550 nm were similar (ĝ1/4120 Mmĝ'1), as too were CO near-surface concentrations (310-340 ppb). We attribute these contrasts to the more flaming combustion of Cerrado fires in the east and more smouldering combustion of deforestation and pasture fires in the west. Horizontal wind shear was important in inhibiting mixed layer growth and plume rise, in addition to advecting pollutants from the Cerrado regions into the remote tropical forest of central Amazonia. Thin layers above the mixing layer indicate the roles of both plume injection and shallow moist convection in delivering pollution to the lower free troposphere. However, detrainment of large smoke plumes into the upper free troposphere was very infrequently observed. Our results reiterate that thermodynamics control the pollutant vertical distribution and thus point to the need for correct model representation so that the spatial distribution and vertical structure of biomass burning smoke is captured. We observed an increase of aerosol abundance relative to CO with altitude both in the background haze and plume enhancement ratios. It is unlikely associated with thermodynamic partitioning, aerosol deposition or local non-fire sources. We speculate it may be linked to long-range transport from West Africa or fire combustion efficiency coupled to plume injection height. Further enquiry is required to explain the phenomenon and explore impacts on regional climate and air quality. © Author(s) 2019
语种	英语
scopus关键词	aerosol; air quality; aircraft emission; atmospheric pollution; biomass burning; black carbon; combustion; dry season; in situ measurement; regional climate; tropical forest; vertical distribution; South America
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144444
作者单位	Centre for Atmospheric Science, University of Manchester, Manchester, United Kingdom; Met Office, Exeter, United Kingdom; Facility for Airborne Atmospheric Measurements (FAAM), University of Cranfield, Cranfield, United Kingdom; CEMPS, University of Exeter, Exeter, United Kingdom; Physics Institute, University of Sao Paulo, Sao Paulo, Brazil; National Institute for Space Research (INPE), Sao Jose dos Campos, Brazil; Laboratory for Meteorological Physics (LaMP), University Clermont Auvergne, Aubière, France; NASA Goddard Space Flight Center, USRA/GESTAR, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Darbyshire E.,Morgan W.T.,Allan J.D.,et al. The vertical distribution of biomass burning pollution over tropical South America from aircraft in situ measurements during SAMBBA[J],2019,19(9).
APA	Darbyshire E..,Morgan W.T..,Allan J.D..,Liu D..,Flynn M.J..,...&Coe H..(2019).The vertical distribution of biomass burning pollution over tropical South America from aircraft in situ measurements during SAMBBA.Atmospheric Chemistry and Physics,19(9).
MLA	Darbyshire E.,et al."The vertical distribution of biomass burning pollution over tropical South America from aircraft in situ measurements during SAMBBA".Atmospheric Chemistry and Physics 19.9(2019).