气候变化领域集成服务门户(CCPortal): Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke

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DOI	10.5194/acp-20-4757-2020
	Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke
	Holanda B.A.; Pöhlker M.L.; Walter D.; Saturno J.; Sörgel M.; Ditas J.; Ditas F.; Schulz C.; Aurélio Franco M.; Wang Q.; Donth T.; Artaxo P.; Barbosa H.M.J.; Borrmann S.; Braga R.; Brito J.; Cheng Y.; Dollner M.; Kaiser J.W.; Klimach T.; Knote C.; Krüger O.O.; Fütterer D.; Lavric J.V.; Ma N.; MacHado L.A.T.; Ming J.; Morais F.G.; Paulsen H.; Sauer D.; Schlager H.; Schneider J.; Su H.; Weinzierl B.; Walser A.; Wendisch M.; Ziereis H.; Zöger M.; Pöschl U.; Andreae M.O.; Pöhlker C.
发表日期	2020
ISSN	1680-7316
起始页码	4757
结束页码	4785
卷号	20 期号:8
英文摘要	Black carbon (BC) aerosols influence the Earth's atmosphere and climate, but their microphysical properties, spatiotemporal distribution, and long-range transport are not well constrained. This study presents airborne observations of the transatlantic transport of BC-rich African biomass burning (BB) smoke into the Amazon Basin using a Single Particle Soot Photometer (SP2) as well as several complementary techniques. We base our results on observations of aerosols and trace gases off the Brazilian coast onboard the HALO (High Altitude and LOng range) research aircraft during the ACRIDICON-CHUVA campaign in September 2014. During flight AC19 over land and ocean at the northeastern coastline of the Amazon Basin, we observed a BCrich layer at ∼ 3:5 km altitude with a vertical extension of ∼ 0:3 km. Backward trajectories suggest that fires in African grasslands, savannas, and shrublands were the main source of this pollution layer and that the observed BB smoke had undergone more than 10 d of atmospheric transport and aging over the South Atlantic before reaching the Amazon Basin. The aged smoke is characterized by a dominant accumulation mode, centered at about 130 nm, with a particle concentration of Nacc D 850±330 cm-3. The rBC particles account for ∼ 15 % of the submicrometer aerosol mass and ∼ 40 % of the total aerosol number concentration. This corresponds to a mass concentration range from 0.5 to 2 μ g m-3 (1st to 99th percentiles) and a number concentration range from 90 to 530 cm-3. Along with rBC, high cCO (150 ± 30 ppb) and cO3 (56 ± 9 ppb) mixing ratios support the biomass burning origin and pronounced photochemical aging of this layer. Upon reaching the Amazon Basin, it started to broaden and to subside, due to convective mixing and entrainment of the BB aerosol into the boundary layer. Satellite observations show that the transatlantic transport of pollution layers is a frequently occurring process, seasonally peaking in August/September. By analyzing the aircraft observations together with the long-term data from the Amazon Tall Tower Observatory (ATTO), we found that the transatlantic transport of African BB smoke layers has a strong impact on the northern and central Amazonian aerosol population during the BBinfluenced season (July to December). In fact, the early BB season (July to September) in this part of the Amazon appears to be dominated by African smoke, whereas the later BB season (October to December) appears to be dominated by South American fires. This dichotomy is reflected in pronounced changes in aerosol optical properties such as the single scattering albedo (increasing from 0.85 in August to 0.90 in November) and the BC-to-CO enhancement ratio (decreasing from 11 to 6 ng m-3 ppb-1). Our results suggest that, despite the high fraction of BC particles, the African BB aerosol acts as efficient cloud condensation nuclei (CCN), with potentially important implications for aerosol-cloud interactions and the hydrological cycle in the Amazon. © 2020 Author(s).
语种	英语
scopus关键词	accumulation; aerosol property; atmospheric pollution; atmospheric transport; biomass burning; black carbon; concentration (composition); dry season; photometer; soot; Amazon Basin
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/141392
作者单位	Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP, 05508-090, Brazil; Max Planck Institute for Biogeochemistry, Jena, 07701, Germany; Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Institute for Environmental and Climate Research (ECI), Jinan University, Guangzhou, 511443, China; Experimental Aerosol and Cloud Microphysics Department, TROPOS, Leibniz-Institute for Tropospheric Research, Leipzig, Germany; Particle Chemistry Department, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany; Institute for Physics of the Atmosphere, Johannes Gutenberg University, Mainz, 55128, Germany; University of Vienna, Faculty of Physics, Aerosol Physics and Environmental Physics, Vienna, 1090, Austria; Institute...
推荐引用方式 GB/T 7714	Holanda B.A.,Pöhlker M.L.,Walter D.,et al. Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke[J],2020,20(8).
APA	Holanda B.A..,Pöhlker M.L..,Walter D..,Saturno J..,Sörgel M..,...&Pöhlker C..(2020).Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke.Atmospheric Chemistry and Physics,20(8).
MLA	Holanda B.A.,et al."Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke".Atmospheric Chemistry and Physics 20.8(2020).