Fires increase Amazon forest productivity through increases in diffuse radiation

Autor(es):Mostrar menos -

Rap, A. ^[1] ; Spracklen, D. V. ^[1] ; Mercado, L. ^{[2, 3]} ; Reddington, C. L. ^[1] ; Haywood, J. M. ^[4] ; Ellis, R. J. ^[3] ; Phillips, O. L. ^[5] ; Artaxo, P. ^[6] ; Bonal, D. ^[7] ; Coupe, N. Restrepo ^[8] ; Butt, N. ^[9]

Afiliação do(s) autor(es)

^[1] Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire - England

^[2] Univ Exeter, Coll Life & Environm Sci, Exeter, Devon - England

^[3] Ctr Ecol & Hydrol, Wallingford, Oxon - England

^[4] Univ Exeter, Coll Engn Math & Phys Sci, Exeter, Devon - England

^[5] Univ Leeds, Sch Geog, Leeds LS2 9JT, W Yorkshire - England

^[6] Univ Sao Paulo, Inst Phys, Sao Paulo - Brazil

^[7] INRA UMR Ecol & Ecophysiol Forestieres, Champenoux - France

^[8] Univ Technol Sydney, Plant Funct Biol & Climate Change Cluster, Ultimo, NSW - Australia

^[9] Univ Queensland, Sch Biol Sci, St Lucia, Qld - Australia

• Tipo de documento: Artigo Científico
• Fonte: Geophysical Research Letters; v. 42, n. 11, p. 4654-4662, JUN 16 2015.
• Citações Web of Science: 32

Resumo

Atmospheric aerosol scatters solar radiation increasing the fraction of diffuse radiation and the efficiency of photosynthesis. We quantify the impacts of biomass burning aerosol (BBA) on diffuse radiation and plant photosynthesis across Amazonia during 1998-2007. Evaluation against observed aerosol optical depth allows us to provide lower and upper BBA emissions estimates. BBA increases Amazon basin annual mean diffuse radiation by 3.4-6.8% and net primary production (NPP) by 1.4-2.8%, with quoted ranges driven by uncertainty in BBA emissions. The enhancement of Amazon basin NPP by 78-156TgCa(-1) is equivalent to 33-65% of the annual regional carbon emissions from biomass burning. This NPP increase occurs during the dry season and acts to counteract some of the observed effect of drought on tropical production. We estimate that 30-60TgCa(-1) of this NPP enhancement is within woody tissue, accounting for 8-16% of the observed carbon sink across mature Amazonian forests. (AU)

• Processo FAPESP: 13/05014-0 - GoAmazon: interação da pluma urbana de Manaus com emissões biogênicas da Floresta Amazônica
• Beneficiário: Paulo Eduardo Artaxo Netto
• Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 14/50297-2 - Espectrometria de massa de aerossóis na Amazônia
• Beneficiário: Paulo Eduardo Artaxo Netto
• Linha de fomento: Auxílio à Pesquisa - Regular