on the vertical distribution of smoke in the amazonian atmosphere during the dry season
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2016
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Abstract
Lidar observations of smoke aerosols have been analysed from six
flights of the Facility for Airborne Atmospheric Measurements
BAe-146 research aircraft over Brazil during the biomass burning
season (September 2012).
A large aerosol optical depth (AOD) was observed, typically ranging
0.4–0.9, along with a typical aerosol extinction coefficient of
100–400 Mm−1.
The data highlight the persistent and widespread nature of the
Amazonian haze, which had a consistent vertical structure, observed
over a large distance ( ∼ 2200 km) during a period of 14 days.
Aerosols were found near the surface; but the larger aerosol load was
typically found in elevated layers that extended from 1–1.5 to 4–6 km.
The measurements have been compared to model predictions with the
Met Office Unified Model (MetUM) and the ECMWF-MACC model.
The MetUM generally reproduced the vertical structure of the Amazonian
haze observed with the lidar.
The ECMWF-MACC model was also able to reproduce the general features
of smoke plumes albeit with a small overestimation of the AOD.
The models did not always capture localised features such as
(i) smoke plumes originating from individual fires, and (ii) aerosols
in the vicinity of clouds.
In both these circumstances, peak extinction coefficients of the order of
1000–1500 Mm−1 and AODs as large as 1–1.8 were encountered, but
these features were either underestimated or not captured in the model
predictions.
Smoke injection heights derived from the Global Fire Assimilation
System (GFAS) for the region are compatible with the general height
of the aerosol layers.
| Reference Key |
marenco2016atmosphericon
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|---|---|
| Authors | ;F. Marenco;B. Johnson;J. M. Langridge;J. Mulcahy;A. Benedetti;S. Remy;L. Jones;K. Szpek;J. Haywood;J. Haywood;K. Longo;P. Artaxo |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-2155-2016
|
| URL | |
| Keywords |
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