The effects of biomass burning aerosols and clouds on the CO<sub>2</sub>flux in Amazonia

Oliveira, Paulo H.; Artaxo, Paulo; Pires, Carlos Eduardo Santos; Lucca, Silvia De; Procópio, Aline Sarmento; Holben, B. N.; Schafer, J. S.; Cardoso, Luiz Francisco; Wofsy, Steven C.; Rocha, Humberto Ribeiro da

doi:10.3402/tellusb.v59i3.16994

Cited by 15 publications

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“…Under cloudy skies, the NEE increased more than 30% in temperate forest ecosystems (Gu et al, 1999). But, the NEE increased less than 25% under cloudy skies in the forest ecosystems in Amazonia (Oliveira et al, 2007). These findings suggest that the net carbon uptake increases more in temperate forests than in subtropical forests under cloudy sky conditions.…”

Section: Differences In the Responses Of Nee To Cloudiness In Differementioning

confidence: 54%

Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China

Zhang

et al. 2010

Biogeosciences

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Abstract. Clouds can significantly affect carbon exchange process between forest ecosystems and the atmosphere by influencing the quantity and quality of solar radiation received by ecosystem's surface and other environmental factors. In this study, we analyzed the effects of cloudiness on net ecosystem exchange of carbon dioxide (NEE) in a temperate broad-leaved Korean pine mixed forest at Changbaishan (CBS) and a subtropical evergreen broad-leaved forest at Dinghushan (DHS), based on the flux data obtained during June-August from 2003 to 2006. The results showed that the response of NEE of forest ecosystems to photosynthetically active radiation (PAR) differed under clear skies and cloudy skies. Compared with clear skies, the light-saturated maximum photosynthetic rate (P ec,max ) at CBS under cloudy skies during mid-growing season (from June to August) increased by 34%, 25%, 4% and 11% in 2003, 2004, 2005 and 2006, respectively. In contrast, P ec,max of the forest ecosystem at DHS was higher under clear skies than under cloudy skies from 2004 to 2006. When the clearness index (k t ) ranged between 0.4 and 0.6, the NEE reached its maximum at both CBS and DHS. However, the NEE decreased more dramatically at CBS than at DHS when k t exceeded 0.6. The results indicate that cloudy sky conditions are beneficial to net carbon uptake in the temperate forest ecosystem and the subtropical forest ecosystem. Under clear skies, vapor pressure deficit (VPD) and air temperature increased due to strong light. These environmental conditions led to greater decrease in gross ecosystem photosynthesis (GEP) and greater increase in ecosystem respiration (R e ) at CBS than at DHS. As a result, clear sky conditions caused more reduction of NEE in the temperate forest ecosystem than in the subtropical forest ecosystem. The response of NEE of Correspondence to: G.-R. Yu (yugr@igsnrr.ac.cn) different forest ecosystems to the changes in cloudiness is an important factor that should be included in evaluating regional carbon budgets under climate change conditions.

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Section: Differences In the Responses Of Nee To Cloudiness In Differementioning

confidence: 54%

Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China

Zhang

et al. 2010

Biogeosciences

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“…Estudos confirmam a Amazônia como um potencial emissor de material particulado biogênico (GRAHAM et al, 2003;ANDREAE, 2007;RIZZO et al, 2010), mas há também a contribuição de partículas emitidas pela queima de biomassa que influenciam fortemente as taxas fotossintéticas que afetam o balanço regional de carbono (OLIVEIRA et al, 2007). Sendo também responsáveis por alterações no balanço radiativo da atmosfera (RAMANATHAN et al, 2001).…”

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Análise Da Profundidade Ótica De Aerossóis E Coeficiente De Angstrom No Cerrado Mato-Grossense

Palácios

Sallo²,

Prado³

et al. 2014

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“…In Amazonia it was shown that aerosol particles from biomass burning strongly influence photosynthetic rates, affecting the regional carbon balance (Oliveira et al, 2007). Understanding these effects requires detailed information on aerosol sources and sinks, and on processes that regulate aerosol emissions and transformations.…”

Section: à3mentioning

confidence: 99%

Aerosol properties, in-canopy gradients, turbulent fluxes and VOC concentrations at a pristine forest site in Amazonia

Rizzo

Artaxo

Karl

et al. 2010

Atmospheric Environment

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a b s t r a c tAerosol physical and chemical properties were measured in a forest site in central Amazonia (Cuieiras reservation, 2.61S; 60.21W) during the dry season of 2004 (AugeOct). Aerosol light scattering and absorption, mass concentration, elemental composition and size distributions were measured at three tower levels (Ground: 2 m; Canopy: 28 m, and Top: 40 m). For the first time, simultaneous eddy covariance fluxes of fine mode particles and volatile organic compounds (VOC) were measured above the Amazonian forest canopy. Aerosol fluxes were measured by eddy covariance using a Condensation Particle Counter (CPC) and a sonic anemometer. VOC fluxes were measured by disjunct eddy covariance using a Proton Transfer Reaction Mass Spectrometer (PTR-MS). At nighttime, a strong vertical gradient of phosphorus and potassium in the aerosol coarse mode was observed, with higher concentrations at Ground level. This suggests a source of primary biogenic particles below the canopy. Equivalent black carbon measurements indicate the presence of lightabsorbing aerosols from biogenic origin. Aerosol number size distributions typically consisted of superimposed Aitken (76 nm) and accumulation modes (144 nm), without clear events of new particle formation. Isoprene and monoterpene fluxes reached respectively 7.4 and 0.82 mg m À2 s À1 around noon. An average fine particle flux of 0.05 AE 0.10 10 6 m À2 s À1 was calculated, denoting an equilibrium between emission and deposition fluxes of fine mode particles at daytime. No significant correlations were found between VOC and fine mode aerosol concentrations or fluxes.

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The effects of biomass burning aerosols and clouds on the CO₂flux in Amazonia

Cited by 15 publications

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Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China

Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China

Análise Da Profundidade Ótica De Aerossóis E Coeficiente De Angstrom No Cerrado Mato-Grossense

Aerosol properties, in-canopy gradients, turbulent fluxes and VOC concentrations at a pristine forest site in Amazonia

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The effects of biomass burning aerosols and clouds on the CO2flux in Amazonia

Cited by 15 publications

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Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China

Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China

Análise Da Profundidade Ótica De Aerossóis E Coeficiente De Angstrom No Cerrado Mato-Grossense

Aerosol properties, in-canopy gradients, turbulent fluxes and VOC concentrations at a pristine forest site in Amazonia

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The effects of biomass burning aerosols and clouds on the CO₂flux in Amazonia