Cloud condensation nuclei in pristine tropical rainforest air of Amazonia: size-resolved measurements and modeling of atmospheric aerosol composition and CCN activity

By S. S. Gunthe, S. King, D. Rose, Qi Chen, P. Roldin, Delphine K. Farmer, J. L. Jimenez, P. Artaxo, M. Andreae, S. Martin and 1 more. 2009

342 citations recorded by the source corpus.

Atmospheric aerosol particles serving as cloud condensation nuclei (CCN) are key elements of the hydro- logical cycle and climate. We have measured and charac- terized CCN at water vapor supersaturations in the range of S=0.10-0.82% in pristine tropical rainforest air during the AMAZE-08 campaign in central Amazonia. The effective hygroscopicity parameters describing the influence of chemical composition on the CCN activ- ity of aerosol particles varied in the range of 0.1-0.4 (0.16±0.06 arithmetic mean and standard deviation). The overall median value of 0.15 was by a factor of two lower than the values typically observed for continental aerosols in other regions of the world. Aitken mode particles were less hygroscopic than accumulation mode particles ( 0.1 at D 50 nm; 0.2 at D 200 nm), which is in agreement with earlier hygroscopicity tandem differential mobility ana- lyzer (H-TDMA) studies. The CCN measurement results are consistent with aerosol mass spectrometry (AMS) data, showing that the organic mass fraction (forg) was on average as high as 90% in the Aitken mode (D 100 nm) and decreased with increas- ing particle diameter in the accumulation mode ( 80% at D 200 nm). The values exhibited a negative linear cor-

Subfields: Atmospheric Science, Global and Planetary Change, Health, Toxicology and Mutagenesis

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Citations in the corpus

Competition between water uptake and ice nucleation by glassy organic aerosol particles (2014, methodology): “A typical value forκorg in biogenic SOA particles collected in pristine rainforest environments is 0.1 (Gunthe et al., 2009), which was also used by Koop et al. (2011) for their estimation of glass transition values in biogenic SOA.”
Aerosol Mixing State: Measurements, Modeling, and Impacts (2019, background): “For highly aged aerosol where the particle population is assumed to be internally mixed, a well-constrained size distribution can thus be sufficient for CCN closure (Broekhuizen et al., 2006; Dusek et al., 2006; Gunthe et al., 2009).”
A single parameter representation of hygroscopic growth and cloud condensation nucleus activity – Part 3: Including surfactant partitioning (2012, positive): “In practice, however, many investigators have appliedκ = ∑ εiκapp,i successfully to ambient CCN measurements (Gunthe et al., 2009; Shinozuka et al., 2009; Dusek et al., 2010; Cerully et al., 2011).”
Cloud condensation nucleation activity of biomass burning aerosol (2009, background): “…in chamber experiments (0.06 < k < 0.14) [Duplissy et al., 2008; King et al., 2009; Prenni et al., 2007] and also in the range of estimates for the organic component of ambient aerosol (0.02 < korganic < 0.2) [Carrico et al., 2005; Gunthe et al., 2009; Shantz et al., 2008; Wang et al., 2008].”
Cloud condensation nuclei production associated with atmospheric nucleation: a synthesis based on existing literature and new results (2012, background): “…under various tropospheric conditions (Dusek et al., 2006; Hudson et al., 2007; Furutani et al., 2008; Kuwata et al., 2008; Quinn et al., 2008; Gunthe et al., 2009; Kammermann et al., 2010; Mochida et al., 2010; Roberts et al., 2010; Deng et al., 2011; Gunthe et al., 2011; Irwin et al.,…”
Aerosol- and updraft-limited regimes of cloud droplet formation: influence of particle number, size and hygroscopicity on the activation of cloud condensation nuclei (CCN) (2009, methodology): “…of regimes in their simulations based on particle size distributions and κ values measured in polluted mega-city air of Beijing, and the same applies for pristine rainforest aerosols (Gunthe et al., 2009a) with different proportions of nucleation , Aitken, accumulation, and coarse mode particles.”
Scanning Mobility CCN Analysis—A Method for Fast Measurements of Size-Resolved CCN Distributions and Activation Kinetics (2010, background): “…mode,” where the voltage applied to the DMA is held constant during a CCN measurement; the voltage is increased stepwise for another CCN measurement to cover the entire size range of the DMA (Rose et al. 2010; Gunthe et al. 2009; Petters et al. 2007; Asa-Awuku et al. 2008, Petters et al. 2009).”