dc.contributor.author | Hodgson, AK | |
dc.contributor.author | Morgan, WT | |
dc.contributor.author | O'Shea, S | |
dc.contributor.author | Bauguitte, S | |
dc.contributor.author | Allan, JD | |
dc.contributor.author | Darbyshire, E | |
dc.contributor.author | Flynn, MJ | |
dc.contributor.author | Liu, D | |
dc.contributor.author | Lee, J | |
dc.contributor.author | Johnson, B | |
dc.contributor.author | Haywood, J | |
dc.contributor.author | Longo, KM | |
dc.contributor.author | Artaxo, PE | |
dc.contributor.author | Coe, H | |
dc.date.accessioned | 2018-03-21T10:56:48Z | |
dc.date.issued | 2017-01-25 | |
dc.description.abstract | We profile trace gas and particulate emissions from near-field airborne measurements of discrete smoke plumes in Brazil during the 2012 biomass burning season. The South American Biomass Burning Analysis (SAMBBA) Project conducted during September and October 2012 sampled across two distinct fire regimes prevalent in the Amazon Basin. Combined measurements from a Compact Time Of Flight Aerosol Mass Spectrometer (C-ToF-AMS) and a Single Particle Soot Photometer (SP2) are reported for the first time in a tropical biomass burning environment. Emissions from a mostly-smouldering rainforest wildfire in Rondonia state and numerous smaller flaming Cerrado fires in Tocantins state are presented. While the Cerrado fires appear to be representative of typical fire conditions in the existing literature, the rainforest wildfire likely represents a more extreme example of biomass burning with a bias towards mostly-smouldering emissions. We determined fire integrated modified combustion efficiencies, emission ratios and emission factors for trace gas and particulate components for these two fire types, alongside aerosol microphysical properties. Seven times more black carbon was emitted from the Cerrado fires per unit of fuel combustion (EFBC of 0.13 ± 0.04 g kg−1) compared to the rainforest fire (EFBC of 0.019 ± 0.006 g kg−1) and more than six times the amount of organic aerosol was emitted from the rainforest fire per unit of fuel combustion (EFOC of 5.00 ± 1.58 g kg−1) compared to the Cerrado fires (EFOC of 0.82 ± 0.26 g kg−1).
Particulate phase species emitted from the fires sampled are generally lower than those reported in previous studies and in emission inventories, which is likely a combination of differences in fire combustion efficiency and fuel content, along with different measurement techniques. Previous modelling studies focussed on the biomass burning season in tropical South America have required significant scaling of emissions to reproduce in-situ and satellite aerosol concentrations over the region. Our results do not indicate that emission factors used in inventories are biased low, which could be one potential cause of the reported underestimates in modelling studies. This study supplements and updates trace gas and particulate emission factors for fire type specific biomass burning in Brazil for use in weather and climate models. The study illustrates that initial fire conditions can result in substantial differences in terms of their emitted chemical components, which can potentially perturb the Earth system. | en_GB |
dc.description.sponsorship | We would like to acknowledge the substantial efforts of the whole SAMBBA team before, during and after the project.
Airborne data was obtained using the BAe-146-301 Atmospheric Research Aircraft (ARA) flown by Directflight Ltd and managed by the
Facility for Airborne Atmospheric Measurements (FAAM), which is a joint entity of the Natural Environment Research Council (NERC) and the Met Office. Active fire data was produced by the University of Maryland and acquired from the online Fire Information for Resource
Management System (FIRMS; https://earthdata.nasa.gov/data/near-real-time-data/firms/abouts; specific product: MCD14ML). E.
Darbyshire was supported by NERC studentship NE/J500057/1 and NE/K500859/1. This work was supported by the NERC SAMBBA
project NE/J010073/1. | en_GB |
dc.identifier.citation | Published online 25 January 2017 | en_GB |
dc.identifier.doi | 10.5194/acp-2016-1019 | |
dc.identifier.uri | http://hdl.handle.net/10871/32188 | |
dc.language.iso | en | en_GB |
dc.publisher | European Geosciences Union (EGU) / Copernicus Publications | en_GB |
dc.relation.source | All raw time series data used to derive the emission ratios and factors from the FAAM research aircraft are publically available
from the Centre for Environmental Data Analysis website (http://www.ceda.ac.uk/). SP2 size distribution data is available
10 on request due to the size of the data files. Data masks for categorising flight patterns into plume-sampling and other sampling
types (vertical profiles and SLRs) are currently available on request. Active fire data used in the manuscript is available
publically from NASA. | en_GB |
dc.rights | © Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License: https://creativecommons.org/licenses/by/3.0/ | en_GB |
dc.title | Near-field emission profiling of Rainforest and Cerrado fires in Brazil during SAMBBA 2012 | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2018-03-21T10:56:48Z | |
dc.description | This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP). | en_GB |
dc.identifier.journal | Atmospheric Chemistry and Physics Discussions | en_GB |