Influence of biomass aerosol on precipitation over the Central Amazon: an observational study

Gonçalves, Weber Andrade; Machado, Luiz A. T.; Kirstetter, Pierre‐Emmanuel

doi:10.5194/acp-15-6789-2015

Cited by 62 publications

(81 citation statements)

References 62 publications

(93 reference statements)

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“…The observed associations in Fig. 3 are in line with the recent aerosol-cloud-rainfall association studies under continental conditions (Kourtidis et al, 2015;Myhre et al, 2007;Ten Hoeve et al, 2011), CTP Myhre et al, 2007;Yan et al, 2014), and rainfall (Gonçalves et al, 2015;Heiblum et al, 2012). These studies suggested that aerosolinduced changes in cloud dynamics and microphysics are the potential causal mechanism for the aerosol-cloud-rainfall linear dependence.…”

Section: The Effect Of Underrepresentation Of the Wet-scavenging Effesupporting

confidence: 77%

Investigation of the aerosol–cloud–rainfall association over the Indian summer monsoon region

et al. 2017

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Abstract. Monsoonal rainfall is the primary source of surface water in India. Using 12 years of in situ and satellite observations, we examined the association of aerosol loading with cloud fraction, cloud top pressure, cloud top temperature, and daily surface rainfall over the Indian summer monsoon region (ISMR). Our results showed positive correlations between aerosol loading and cloud properties as well as rainfall. A decrease in outgoing longwave radiation and an increase in reflected shortwave radiation at the top of the atmosphere with an increase in aerosol loading further indicates a possible seminal role of aerosols in the deepening of cloud systems. Significant perturbation in liquid-and icephase microphysics was also evident over the ISMR. For the polluted cases, delay in the onset of collision-coalescence processes and an enhancement in the condensation efficiency allows for more condensate mass to be lifted up to the mixed colder phases. This results in the higher mass concentration of larger-sized ice-phase hydrometeors and, therefore, implies that the delayed rain processes eventually lead to more surface rainfall. A numerical simulation of a typical rainfall event case over the ISMR using a spectral bin microphysical scheme coupled with the Weather Research Forecasting (WRF-SBM) model was also performed. Simulated microphysics also illustrated that the initial suppression of warm rain coupled with an increase in updraft velocity under high aerosol loading leads to enhanced super-cooled liquid droplets above freezing level and ice-phase hydrometeors, resulting in increased accumulated surface rainfall. Thus, both observational and numerical analysis suggest that high aerosol loading may induce cloud invigoration, thereby increasing surface rainfall over the ISMR. While the meteorological variability influences the strength of the observed positive association, our results suggest that the persistent aerosol-associated deepening of cloud systems and an intensification of surface rain amounts was applicable to all the meteorological sub-regimes over the ISMR. Hence, we believe that these results provide a step forward in our ability to address aerosol-cloud-rainfall associations based on satellite observations over the ISMR.

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Section: The Effect Of Underrepresentation Of the Wet-scavenging Effesupporting

confidence: 77%

Investigation of the aerosol–cloud–rainfall association over the Indian summer monsoon region

et al. 2017

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“…Accordingly, the life cycle of shallow and deep convective clouds in the Amazon has been subject of numerous previous studies (e.g., Andreae et al, 2004;Freud et al, 2008;Rosenfeld et al, 2016b;Wendisch et al, 2016;Braga et al, 2017). In particular, the extent of 10 anthropogenic influence on cloud lifecycle through continuous land use change and combustion-related aerosol emissions has been actively debated (Roberts et al, 2003;Davidson et al, 2012;Goncalves et al, 2015). It is well established that the properties and dynamics of clouds can be fundamentally altered by changing cloud condensation nuclei (CCN) regimes, which are a fraction of the total (tropospheric) aerosol population Reutter et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Long-term observations of cloud condensation nuclei in the Amazon rain forest – Part 2: Variability and characteristic differences under near-pristine, biomass burning, and long-range transport conditions

Pöhlker

Ditas

Saturno

et al. 2017

Preprint

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Size-resolved measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations and hygroscopicity were conducted at the remote Amazon Tall Tower Observatory (ATTO) in the central Amazon Basin over a full seasonal cycle (Mar 2014 -Feb 2015. In a companion part 1 paper, we presented an in-depth CCN characterization based on annually as well as seasonally averaged time intervals and discuss different para-5 metrization strategies to represent the Amazonian CCN cycling in modelling studies (M. Pöhlker et. al. 2016b).The present part 2 study analyzes the aerosol and CCN variability in original time resolution and, thus, resolves aerosol advection and transformation for the following case studies, which represent the most characteristic states of the Amazonian atmosphere: ), a mostly organic particle composition, and relatively low hygroscopicity levels (κAit = 0.12 vs. κacc = 0.18). The NP CCN efficiency spectrum shows that the CCN population is sensitive to changes in supersaturation (S) over a wide S range. Atmos. Chem. Phys. Discuss., https://doi

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“…14(b). Gonçalves et al (2015) analysed rainfall data in the Amazon and suggest that the influence of biomass burning on precipitation is dependent in part on the degree of atmospheric instability. In a more stable atmosphere, BBA tends to decrease the precipitation; they also note that increasing 10 cloud droplet number, and decreasing droplet size, would act to reduce precipitation in the absence of strong convection.…”

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confidence: 99%

The Effect of South American Biomass Burning Aerosol Emissions on the Regional Climate

Thornhill¹,

Ryder²,

Highwood³

et al. 2017

Preprint

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Abstract. The impact of biomass burning aerosol (BBA) on the regional climate in South America is assessed using 30 year simulations with a global atmosphere-only configuration of the Met Office Unified Model. We compare two simulations of high and low emissions of biomass burning aerosol based on realistic interannual variability. The aerosol scheme in the model has hygroscopic growth and optical properties for BBA informed by recent observations, including those from the recent South American Biomass Burning Analysis (SAMBBA) intensive aircraft observations made during September 2012. We There is some evidence that some impacts of increased BBA persist through the transition into the monsoon, particularly in precipitation, but the differences are only statistically significant in some small regions in November. This study therefore provides an insight into how variability in deforestation and biomass burning emissions may contribute to the South American climate, and consequently on the possible impacts of future changes in BBA emissions. 251 Atmos. Chem. Phys. Discuss., https://doi

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Influence of biomass aerosol on precipitation over the Central Amazon: an observational study

Cited by 62 publications

References 62 publications

Investigation of the aerosol–cloud–rainfall association over the Indian summer monsoon region

Investigation of the aerosol–cloud–rainfall association over the Indian summer monsoon region

Long-term observations of cloud condensation nuclei in the Amazon rain forest – Part 2: Variability and characteristic differences under near-pristine, biomass burning, and long-range transport conditions

The Effect of South American Biomass Burning Aerosol Emissions on the Regional Climate

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