Trace elements in the Venezuelan savannah atmosphere during dry and wet periods, with and without vegetation burning

Morales, J. Guzman; Hermoso, Mariela; Serrano, Juan Antonio Cámara; Sanhueza, Eugenio

doi:10.1016/0960-1686(90)90121-3

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…This Venezuelan savannah is located between the Amazon forest in the south and the Caribbean Sea in the north. The climatological seasons in the region are defined by a rainy season from May to November and a dry season from December to April (Morales et al, 1990). Frequent biomass burning occurs in Table 1.…”

Section: Measurement Sitementioning

confidence: 99%

“…Most fires in the savannah region are of anthropogenic origin, for example, to control weeds and pest, to prevent litter accumulation, or to accelerate nutrient cycling (Sanhueza et al, 1999). In situ observations in the savannah region of the Venezuelan low lands proved a substantial contribution of biomass burning to the particle load at remote sites (Sanhueza et al, 1987;Morales et al, 1990). Biomass burning plumes originating from this area were observed at high altitudes during several airborne field campaigns (e.g.…”

Section: T Hamburger Et Al: Observations Of Biomass Burning Particlmentioning

confidence: 99%

“…In addition, we applied the Feature Classification Flags (Mielonen et al, 2009;Omar et al, 2009) to estimate the most frequent aerosol type of the upper most aerosol layer at the respective location. Data for the months February-April, that is, the months of the main biomass burning period in Venezuela (Morales et al, 1990), were averaged over the years of the in situ observations -2009.…”

Section: Air Mass Transport Analysis and Satellite Observationsmentioning

confidence: 99%

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Long-term in situ observations of biomass burning aerosol at a high altitude station in Venezuela – sources, impacts and interannual variability

et al. 2013

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Abstract. First long-term observations of South American biomass burning aerosol within the tropical lower free troposphere are presented. The observations were conducted between 2007 and 2009 at a high altitude station (4765 m a.s.l.) on the Pico Espejo, Venezuela. Sub-micron particle volume, number concentrations of primary particles and particle absorption were observed. Orographic lifting and shallow convection leads to a distinct diurnal cycle at the station. It enables measurements within the lower free troposphere during night-time and observations of boundary layer air masses during daytime and at their transitional regions. The seasonal cycle is defined by a wet rainy season and a dry biomass burning season. The particle load of biomass burning aerosol is dominated by fires in the Venezuelan savannah. Increases of aerosol concentrations could not be linked to long-range transport of biomass burning plumes from the Amazon basin or Africa due to effective wet scavenging of particles. Highest particle concentrations were observed within boundary layer air masses during the dry season. Ambient sub-micron particle volume reached 1.4 ± 1.3 µm 3 cm −3 , refractory particle number concentrations (at 300 • C) 510 ± 420 cm −3 and the absorption coefficient 0.91 ± 1.2 Mm −1 . The respective concentrations were lowest within the lower free troposphere during the wet season and averaged at 0.19±0.25 µm 3 cm −3 , 150±94 cm −3 and 0.15±0.26 Mm −1 . A decrease of particle concentrations during the dry seasons from 2007-2009 could be connected to a decrease in fire activity in the wider region of Venezuela using MODIS satellite observations. The variability of biomass burning is most likely linked to the El Niño-Southern Oscillation (ENSO). Low biomass burning activity in the Venezuelan savannah was observed to follow La Niña conditions, high biomass burning activity followed El Niño conditions.

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Section: Measurement Sitementioning

confidence: 99%

Section: T Hamburger Et Al: Observations Of Biomass Burning Particlmentioning

confidence: 99%

Section: Air Mass Transport Analysis and Satellite Observationsmentioning

confidence: 99%

See 1 more Smart Citation

Long-term in situ observations of biomass burning aerosol at a high altitude station in Venezuela – sources, impacts and interannual variability

et al. 2013

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show abstract

Section: Air Mass Transport Analysis and Satellite Observationsmentioning

confidence: 99%

“…Most fires in the savannah region are of anthropogenic ori-gin, for example, to control weeds and pest, to prevent litter accumulation, or to accelerate nutrient cycling (Sanhueza et al, 1999). In situ observations in the savannah region of the Venezuelan low lands proved a substantial contribution of biomass burning to the particle load at remote sites (Sanhueza et al, 1987;Morales et al, 1990). Biomass burning plumes originating from this area were observed at high altitudes during several airborne field campaigns (e.g.…”

Section: Introductionmentioning

confidence: 99%

Long term in-situ observations of biomass burning aerosol at a high altitude station in Venezuela – sources, impacts and inter annual variability

Hamburger¹,

Matisāns²,

Tunved³

et al. 2013

Preprint

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First long-term observations of South American biomass burning aerosol within the tropical lower free troposphere are presented. The observations were conducted between 2007 and 2009 at a high altitude station (4765 m a.s.l.) on the Pico Espejo, Venezuela. Sub-micron aerosol volume, number concentrations of primary particles and particle absorption were observed. Orographic lifting and shallow convection leads to a distinct diurnal cycle at the station. It enables measurements within the lower free troposphere during night time and observations of boundary layer air masses during day time and at their transitional regions. The seasonal cycle is defined by a wet rainy season and a dry biomass burning season. The particle load of biomass burning aerosol is dominated by fires in the Venezuelan savannah. Increases of aerosol concentrations could not be linked to long-range transport of biomass burning plumes from the Amazon basin or Africa due to effective wet scavenging of particles. Highest particle concentrations were observed within boundary layer air masses during the dry season. Ambient sub-micron aerosol volume reached 1.4 ± 1.3 μm³ cm⁻³, heated (300 °C) particle number concentrations 510 ± 420 cm⁻³ and the absorption coefficient 0.91 ± 1.2 Mm⁻¹. The respective concentrations were lowest within the lower free troposphere during the wet season and averaged at 0.19 ± 0.25 μm³ cm⁻³, 150 ± 94 cm⁻³ and 0.15 ± 0.26 Mm⁻¹. A decrease of particle concentrations during the dry seasons from 2007–2009 could be connected to a decrease in fire activity in the wider region of Venezuela using MODIS satellite observations. The variability of biomass burning is most likely linked to the El Niño-Southern Oscillation (ENSO). Low biomass burning activity in the Venezuelan savannah was observed to follow La Niña conditions, high biomass burning activity followed El Niño conditions

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Influence of Weather on the Distribution of $${\mathbf{PM}}_{10}$$ Coming from Controlled Sugarcane Burning Events in Colombia

et al. 2021

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Trace elements in the Venezuelan savannah atmosphere during dry and wet periods, with and without vegetation burning

Cited by 14 publications

References 27 publications

Long-term in situ observations of biomass burning aerosol at a high altitude station in Venezuela – sources, impacts and interannual variability

Long-term in situ observations of biomass burning aerosol at a high altitude station in Venezuela – sources, impacts and interannual variability

Long term in-situ observations of biomass burning aerosol at a high altitude station in Venezuela – sources, impacts and inter annual variability

Influence of Weather on the Distribution of $${\mathbf{PM}}_{10}$$ Coming from Controlled Sugarcane Burning Events in Colombia

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