4 documents found, page 1 of 1
CCN activity and organic hygroscopicity of aerosols downwind of an urban region...
Thalman, Ryan M.; Sá, Suzane S. de; Palm, Brett B.; Barbosa, H. M. J.; Pöhlker, Mira L.; Alexander, Michael Lizabeth; Brito, Joel F.; Carbone, SamaraDuring the Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5) campaign, size-resolved cloud condensation nuclei (CCN) spectra were characterized at a research site (T3) 60 km downwind of the city of Manaus, Brazil, in central Amazonia for 1 year (12 March 2014 to 3 March 2015). Particle hygroscopicity (κCCN) and mixing state were derived from the size-resolved CCN spectra, and the hygroscopici...
Influence of urban pollution on the production of organic particulate matter fr...
Sá, Suzane S. de; Palm, Brett B.; Campuzano-Jost, Pedro; Day, Douglas A.; Newburn, Matt K.; Hu, Weiwei; Isaacman-VanWertz, Gabriel A.; Yee, Lindsay D.The atmospheric chemistry of isoprene contributes to the production of a substantial mass fraction of the particulate matter (PM) over tropical forests. Isoprene epoxydiols (IEPOX) produced in the gas phase by the oxidation of isoprene under HO2-dominant conditions are subsequently taken up by particles, thereby leading to production of secondary organic PM. The present study investigates possible perturbations...
Urban influence on the concentration and composition of submicron particulate m...
Sá, Suzane S. de; Palm, Brett B.; Campuzano-Jost, Pedro; Day, Douglas A.; Hu, Weiwei; Isaacman-VanWertz, Gabriel A.; Yee, Lindsay D.; Brito, Joel F.An understanding of how anthropogenic emissions affect the concentrations and composition of airborne particulate matter (PM) is fundamental to quantifying the influence of human activities on climate and air quality. The central Amazon Basin, especially around the city of Manaus, Brazil, has experienced rapid changes in the past decades due to ongoing urbanization. Herein, changes in the concentration and comp...
Long-term observations of cloud condensation nuclei in the Amazon rain forest -...
Pöhlker, Mira L.; Pöhlker, Christopher; Ditas, Florian; Klimach, Thomas; Angelis, Isabella Hrabe de; Araüjo, Alessandro Carioca de; Brito, Joel F.Size-resolved long-term 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 1-year period and full seasonal cycle (March 2014-February 2015). The measurements provide a climatology of CCN properties characteristic of a remote central Amazonian rain forest sit...