On the vertical distribution of smoke in the Amazonian atmosphere during the dry season

被引:22
作者
Marenco, Franco [1 ]
Johnson, Ben [2 ]
Langridge, Justin M. [3 ]
Mulcahy, Jane [4 ]
Benedetti, Angela [5 ]
Remy, Samuel [6 ]
Jones, Luke [5 ]
Szpek, Kate [3 ]
Haywood, Jim [2 ,7 ]
Longo, Karla [8 ]
Artaxo, Paulo [9 ]
机构
[1] Met Off, Satellite Applicat, Exeter, Devon, England
[2] Met Off, Hadley Ctr, Earth Syst & Mitigat Sci, Exeter, Devon, England
[3] Met Off, Observat Based Res, Exeter, Devon, England
[4] Met Off, Hadley Ctr, Earth Syst Core Dev Grp, Exeter, Devon, England
[5] European Ctr Medium Range Weather Forecasts, Reading, Berks, England
[6] UPMC CNRS, Meteorol Dynam Lab, Paris, France
[7] Univ Exeter, Coll Engn Maths & Phys Sci, Exeter, Devon, England
[8] Inst Nacl Pesquisas Espaciais, BR-12201 Sao Jose Dos Campos, Brazil
[9] Univ Sao Paulo, Inst Phys, Sao Paulo, Brazil
关键词
BIOMASS BURNING AEROSOLS; OPTICAL-PROPERTIES; PHYSICAL-PROPERTIES; LIDAR OBSERVATIONS; SOUTHERN AFRICA; AIRCRAFT; FOREST; CLOUDS; FIRES; VARIABILITY;
D O I
10.5194/acp-16-2155-2016
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 (similar to 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.
引用
收藏
页码:2155 / 2174
页数:20
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