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DOI	10.5194/acp-19-1301-2019
	Studying the impact of biomass burning aerosol radiative and climate effects on the Amazon rainforest productivity with an Earth system model
	Malavelle F.F.; Haywood J.M.; Mercado L.M.; Folberth G.A.; Bellouin N.; Sitch S.; Artaxo P.
发表日期	2019
ISSN	16807316
起始页码	1301
结束页码	1326
卷号	19 期号:2
英文摘要	Diffuse light conditions can increase the efficiency of photosynthesis and carbon uptake by vegetation canopies. The diffuse fraction of photosynthetically active radiation (PAR) can be affected by either a change in the atmospheric aerosol burden and/or a change in cloudiness. During the dry season, a hotspot of biomass burning on the edges of the Amazon rainforest emits a complex mixture of aerosols and their precursors and climate-active trace gases (e.g. CO 2 , CH 4 , NO x ). This creates potential for significant interactions between chemistry, aerosol, cloud, radiation and the biosphere across the Amazon region. The combined effects of biomass burning on the terrestrial carbon cycle for the present day are potentially large, yet poorly quantified. Here, we quantify such effects using the Met Office Hadley Centre Earth system model HadGEM2-ES, which provides a fully coupled framework with interactive aerosol, radiative transfer, dynamic vegetation, atmospheric chemistry and biogenic volatile organic compound emission components. Results show that for present day, defined as year 2000 climate, the overall net impact of biomass burning aerosols is to increase net primary productivity (NPP) by +80 to +105 TgC yr -1 , or 1.9% to 2.7 %, over the central Amazon Basin on annual mean. For the first time we show that this enhancement is the net result of multiple competing effects: an increase in diffuse light which stimulates photosynthetic activity in the shaded part of the canopy (+65 to +110 TgC yr -1 ), a reduction in the total amount of radiation (-52 to -1 05 TgC yr -1 ) which reduces photosynthesis and feedback from climate adjustments in response to the aerosol forcing which increases the efficiency of biochemical processes (+67 to +100 TgC yr -1 ). These results illustrate that despite a modest direct aerosol effect (the sum of the first two counteracting mechanisms), the overall net impact of biomass burning aerosols on vegetation is sizeable when indirect climate feedbacks are considered. We demonstrate that capturing the net impact of aerosols on vegetation should be assessed considering the system-wide behaviour. © Author(s) 2019.
语种	英语
scopus关键词	aerosol; aerosol composition; biological production; biomass burning; climate effect; net primary production; radiative forcing; rainforest; Amazonia
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/144678
作者单位	CEMPS, University of Exeter, Exeter, EX4 4QE, United Kingdom; UK Met Office Hadley Centre, Exeter, EX1 3PB, United Kingdom; CLES, University of Exeter, Exeter, EX4 4RJ, United Kingdom; Centre for Ecology and Hydrology, Wallingford, OX10 8BB, United Kingdom; Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom; Department of Applied Physics, Institute of Physics, University of São Paulo, São Paulo, Brazil
推荐引用方式 GB/T 7714	Malavelle F.F.,Haywood J.M.,Mercado L.M.,et al. Studying the impact of biomass burning aerosol radiative and climate effects on the Amazon rainforest productivity with an Earth system model[J],2019,19(2).
APA	Malavelle F.F..,Haywood J.M..,Mercado L.M..,Folberth G.A..,Bellouin N..,...&Artaxo P..(2019).Studying the impact of biomass burning aerosol radiative and climate effects on the Amazon rainforest productivity with an Earth system model.Atmospheric Chemistry and Physics,19(2).
MLA	Malavelle F.F.,et al."Studying the impact of biomass burning aerosol radiative and climate effects on the Amazon rainforest productivity with an Earth system model".Atmospheric Chemistry and Physics 19.2(2019).