Overview: Precipitation Characteristics and Sensitivities to the Environmental Conditions during GoAmazon2014/5 and ACRIDICON-CHUVA

Machado, Luiz A. T.; Calheiros, Alan James Peixoto; Biscaro, Thiago; Giangrande, Scott; Dias, M. A. Silva; Cecchini, Micael Amore; Albrecht, Rachel I.; Andreae, Meinrat O.; Araujo, Wagner F.; Artaxo, Paulo; Borrmann, Stephan; Braga, Ramon Campos; Burleyson, Casey D.; Eichholz, Cristiano Wickboldt; Fan, Jiwen; Feng, Zhe; Fisch, Gilberto; Jensen, Michael P.; Martin, Scot T.; Pöschl, Ulrich; Pöhlker, Christopher; Pöhlker, Mira L.; Ribaud, Jean-François; Saraiva, Jaci Maria Bilhalva; Schumacher, Courtney; Thalman, Ryan; Walter, David; Wendisch, Manfred

doi:10.5194/acp-2017-990

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…The data presented here were obtained during the ACRIDICON-CHUVA aircraft campaign, which took place over the Amazon Basin during the 2014 dry season, from 6 September to 1 October (Machado et al, 2017;Wendisch et al, 2016). ACRIDICON stands for "Aerosol, Cloud, Precipitation, and Radiation Inter-155 actions and Dynamics of Convective Cloud Systems" and CHUVA is the acronym for "Cloud Processes of the Main Precipitation Systems in Brazil: A Contribution to Cloud Resolving Modeling and to the Global Precipitation Measurement".…”

Section: The Acridicon-chuva Campaignmentioning

confidence: 99%

Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke

Holanda¹,

Pöhlker²,

Saturno³

et al. 2019

Preprint

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Black carbon (BC) aerosols are influencing the Earth's atmosphere and climate, but their microphysical 35 properties, spatiotemporal distribution and long-range transport are not well constrained. This study analyzes the transatlantic transport of BC-rich African biomass burning (BB) pollution into the Amazon Basin, based on airborne observations of aerosol particles and trace gases in and off the Brazilian coast during the ACRIDICON-CHUVA campaign in September 2014, combining in-situ measurements on the research aircraft HALO with satellite remote-sensing and numerical model results. 40 During flight AC19 over land and ocean at the Brazilian coastline in the northeast of the Amazon Basin, we observed a BC-rich atmospheric layer at ~3.5 km altitude with a vertical extension of ~0.3 km.Backward trajectory analyses suggest that fires in African grasslands, savannas, and shrublands were the main source of this pollution layer, and that the observed BB smoke had undergone more than 10 days of atmospheric transport and aging. The BC mass concentrations in the layer ranged from 0.5 to 2 μg m -3 , and 45 the BC particle number fraction of ~40 % was about 8 times higher than observed in a fresh Amazonian BB plume, representing the highest value ever observed in the region. Upon entering the Amazon Basin, the layer started to broaden and to subside, due to convective mixing and entrainment of the BB aerosol into the boundary layer. Satellite observations show that the transatlantic transport of pollution layers is a frequently occurring process, seasonally peaking in August/September. 50By analyzing the aircraft observations within the broader context of the long-term data from the Amazon Tall Tower Observatory (ATTO), we found that the transatlantic transport of African BB smoke layers has a strong impact on the north-central Amazonian aerosol population during the BB-influenced season (July to November). Specifically, the early BB season in this part of the Amazon appears to be dominated by African smoke, whereas the later BB season appears to be dominated by South American fires. 55This dichotomy is reflected in pronounced changes of aerosol optical properties such as the single scattering albedo (increasing from 0.85 in August to 0.90 in November) and the BC-to-CO enhancement ratio (decreasing from 7.4 to 4.4 ng m -3 ppb -1 ). Our results suggest that, despite the high amount of BC particles, the African BB aerosol act as efficient cloud condensation nuclei (CCN) with potentially important implications for aerosol-cloud interactions and the hydrological cycle in the Amazon Basin. 60 The role of the southern African easterly jet in modifying the southeast Atlantic aerosol and cloud environments, Q.

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Section: The Acridicon-chuva Campaignmentioning

confidence: 99%

Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke

Holanda¹,

Pöhlker²,

Saturno³

et al. 2019

Preprint

Self Cite

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“…The Amazon region presents characteristic dry and rainy (wet) seasons, interspersed by transition periods. For this study the entire sampling period was separated only into dry and wet seasons (Table 1) according to the monthly precipitation levels 52 .…”

Section: Samplingmentioning

confidence: 99%

Identification and quantification of giant bioaerosol particles over the Amazon rainforest

et al. 2022

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Eukarya dominate the coarse primary biological aerosol (PBA) above the Amazon rainforest canopy, but their vertical profile and seasonality is currently unknown. In this study, the stratification of coarse and giant PBA >5 µm were analyzed from the canopy to 300 m height at the Amazon Tall Tower Observatory in Brazil during the wet and dry seasons. We show that >2/3 of the coarse PBA were canopy debris, fungal spores commonly found on decaying matter were second most abundant (ranging from 15 to 41%), followed by pollens (up to 5%). The atmospheric roughness layer right above the canopy had the greatest giant PBA abundance. Measurements over 5 years showed an increased abundance of PBA during a low-rainfall period. Giant particles, such as pollen, are reduced at 300 m, suggesting their limited dispersal. These results give insights into the giant PBA emissions of this tropical rainforest, and present a major step in understanding the type of emitted particles and their vertical distribution.

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Overview: Precipitation Characteristics and Sensitivities to the Environmental Conditions during GoAmazon2014/5 and ACRIDICON-CHUVA

Cited by 2 publications

References 46 publications

Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke

Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke

Identification and quantification of giant bioaerosol particles over the Amazon rainforest

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