气候变化领域集成服务门户(CCPortal): Remote biomass burning dominates southern West African air pollution during the monsoon

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DOI	10.5194/acp-19-15217-2019
	Remote biomass burning dominates southern West African air pollution during the monsoon
	Haslett S.L.; Taylor J.W.; Evans M.; Morris E.; Vogel B.; Dajuma A.; Brito J.; Batenburg A.M.; Borrmann S.; Schneider J.; Schulz C.; Denjean C.; Bourrianne T.; Knippertz P.; Dupuy R.; Schwarzenböck A.; Sauer D.; Flamant C.; Dorsey J.; Crawford I.; Coe H.
发表日期	2019
ISSN	16807316
起始页码	15217
结束页码	15234
卷号	19 期号:24
英文摘要	Vast stretches of agricultural land in southern and central Africa are burnt between June and September each year, which releases large quantities of aerosol into the atmosphere. The resulting smoke plumes are carried west over the Atlantic Ocean at altitudes between 2 and 4 km. As only limited observational data in West Africa have existed until now, whether this pollution has an impact at lower altitudes has remained unclear. The Dynamics-aerosol-chemistry-cloud interactions in West Africa (DACCIWA) aircraft campaign took place in southern West Africa during June and July 2016, with the aim of observing gas and aerosol properties in the region in order to assess anthropogenic and other influences on the atmosphere. Results presented here show that a significant mass of aged accumulation mode aerosol was present in the southern West African monsoon layer, over both the ocean and the continent. A median dry aerosol concentration of 6.2 μg m-3 (standard temperature and pressure, STP) was observed over the Atlantic Ocean upwind of the major cities, with an interquartile range from 5.3 to 8.0 μg m-3. This concentration increased to a median of 11.1 μg m-3 (8.6 to 15.7 μg m-3) in the immediate outflow from cities. In the continental air mass away from the cities, the median aerosol loading was 7.5 μg m-3 (5.9 to 10.5 μg m-3). The accumulation mode aerosol population over land displayed similar chemical properties to the upstream population, which implies that upstream aerosol is a significant source of aerosol pollution over the continent. The upstream aerosol is found to have most likely originated from central and southern African biomass burning. This demonstrates that biomass burning plumes are being advected northwards, after being entrained into the monsoon layer over the eastern tropical Atlantic Ocean. It is shown observationally for the first time that they contribute up to 80 % to the regional aerosol loading in the monsoon layer over southern West Africa. Results from the COSMO-ART (Consortium for Small-scale Modeling - Aerosol and Reactive Trace gases) and GEOS-Chem models support this conclusion, showing that observed aerosol concentrations over the northern Atlantic Ocean can only be reproduced when the contribution of transported biomass burning aerosol is taken into account. As a result, the large and growing emissions from the coastal cities are overlaid on an already substantial aerosol background. Simulations using COSMO-ART show that cloud droplet number concentrations can increase by up to 27 % as a result of transported biomass burning aerosol. On a regional scale this renders cloud properties and precipitation less sensitive to future increases in anthropogenic emissions. In addition, such high background loadings will lead to greater pollution exposure for the large and growing population in southern West Africa. These results emphasise the importance of including aerosol from across country borders in the development of air pollution policies and interventions in regions such as West Africa. © 2019 Author(s).
语种	英语
scopus关键词	air quality; atmospheric pollution; biomass burning; COSMOS; monsoon; pollution monitoring; remote sensing; satellite data; satellite imagery; Atlantic Ocean; West Africa
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/143972
作者单位	School of Earth and Environmental Sciences, University of Manchester, Manchester, United Kingdom; Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, United Kingdom; National Centre for Atmospheric Science, University of York, York, United Kingdom; Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany; L'Université Félix Houphoët-Boigny, Abidjan 01, Cote d'Ivoire; Laboratory for Meteorological Physics (LaMP), University Blaise Pascal, Aubière, France; Particle Chemistry Department, Johannes Gutenberg University Mainz, Max Planck Institute for Chemistry, Mainz, 55128, Germany; CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France; Laboratoire de Météorologie Physique, Université Clermont Auvergne, Aubière, France; Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt, Oberpfaffenhofen, Wessling, Germany; LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France; National Centre f...
推荐引用方式 GB/T 7714	Haslett S.L.,Taylor J.W.,Evans M.,et al. Remote biomass burning dominates southern West African air pollution during the monsoon[J],2019,19(24).
APA	Haslett S.L..,Taylor J.W..,Evans M..,Morris E..,Vogel B..,...&Coe H..(2019).Remote biomass burning dominates southern West African air pollution during the monsoon.Atmospheric Chemistry and Physics,19(24).
MLA	Haslett S.L.,et al."Remote biomass burning dominates southern West African air pollution during the monsoon".Atmospheric Chemistry and Physics 19.24(2019).