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DOI | 10.5194/acp-17-3605-2017 |
Composition, size and cloud condensation nuclei activity of biomass burning aerosol from northern Australian savannah fires | |
Mallet, Marc D.1; Cravigan, Luke T.1; Milic, Andelija1; Alroe, Joel1; Ristovski, Zoran D.1; Ward, Jason2; Keywood, Melita2; Williams, Leah R.3; Selleck, Paul2; Miljevic, Branka1 | |
2017-03-14 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA |
英文摘要 | The vast majority of Australia's fires occur in the tropical north of the continent during the dry season. These fires are a significant source of aerosol and cloud condensation nuclei (CCN) in the region, providing a unique opportunity to investigate the biomass burning aerosol (BBA) in the absence of other sources. CCN concentrations at 0.5% supersaturation and aerosol size and chemical properties were measured at the Australian Tropical Atmospheric Research Station (ATARS) during June 2014. CCN concentrations reached over 104 cm 3 when frequent and close fires were burning - up to 45 times higher than periods with no fires. Both the size distribution and composition of BBA appeared to significantly influence CCN concentrations. A distinct diurnal trend in the proportion of BBA activating to cloud droplets was observed, with an activation ratio of 40 +/- 20% during the night and 60 +/- 20% during the day. BBA was, on average, less hygroscopic during the night (kappa = 0.04 +/- 0.03) than during the day (kappa = 0.07 +/- 0.05), with a maximum typically observed just before midday. Size-resolved composition of BBA showed that organics comprised a constant 90% of the aerosol volume for aerodynamic diameters between 100 and 200 nm. While this suggests that the photochemical oxidation of organics led to an increase in the hygroscopic growth and an increase in daytime activation ratios, it does not explain the decrease in hygroscopicity after midday. Modelled CCN concentrations assuming typical continental hygroscopicities produced very large overestimations of up to 200 %. Smaller, but still significant, overpredictions up to similar to 100% were observed using aerosol mass spectrometer (AMS)- and hygroscopicity tandem differential mobility analyser (H-TDMA)- derived hygroscopicities as well as campaign night and day averages. The largest estimations in every case occurred during the night, when the small variations in very weakly hygroscopic species corresponded to large variations in the activation diameters. Trade winds carry the smoke generated from these fires over the Timor Sea, where aerosol-cloud interactions are likely to be sensitive to changes in CCN concentrations, perturbing cloud albedo and lifetime. Dry season fires in northern Australia are therefore potentially very important in cloud processes in this region. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000397827900006 |
WOS关键词 | MEGA-CITY GUANGZHOU ; CCN ACTIVITY ; DROPLET CONCENTRATION ; RESOLVED MEASUREMENTS ; CHEMICAL-COMPOSITION ; PHYSICAL-PROPERTIES ; HYGROSCOPIC GROWTH ; ORGANIC AEROSOL ; POLLUTED AIR ; SMOKE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30734 |
专题 | 地球科学 |
作者单位 | 1.Queensland Univ Technol, Sch Chem, Phys & Mech Engn, Brisbane, Qld 4001, Australia; 2.CSIRO, Oceans & Atmosphere Flagship, Aspendale, Vic 3195, Australia; 3.Inc, Aerodyne Res, Billerica, MA 01821 USA |
推荐引用方式 GB/T 7714 | Mallet, Marc D.,Cravigan, Luke T.,Milic, Andelija,et al. Composition, size and cloud condensation nuclei activity of biomass burning aerosol from northern Australian savannah fires[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(5). |
APA | Mallet, Marc D..,Cravigan, Luke T..,Milic, Andelija.,Alroe, Joel.,Ristovski, Zoran D..,...&Miljevic, Branka.(2017).Composition, size and cloud condensation nuclei activity of biomass burning aerosol from northern Australian savannah fires.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(5). |
MLA | Mallet, Marc D.,et al."Composition, size and cloud condensation nuclei activity of biomass burning aerosol from northern Australian savannah fires".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.5(2017). |
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