10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Bioaerosols Abundance Variability through Cloud Decks across Multiple Environments during BOAS Campaign
ARNALDO NEGRON-MARTY, Natasha De Leon-Rodriguez, Natasha Hodas, Matthew Coggon, Kelvin Bates, Armin Sorooshian, Haflidi Jonsson, John Seinfeld, Richard Flagan, Kostas Konstantinidis, Athanasios Nenes, Georgia Institute of Technology
Abstract Number: 1650 Working Group: Bioaerosols
Abstract Primary biological aerosol particles (PBAP), also known as Bioaerosols, are emitted into the atmosphere from soil or plants in terrestrial environments, or from the sea surface microlayer in marine environments. Once they reach the planetary boundary layer, meteorological factors {e.g. UV radiation, temperature, wind speed and relative humidity (RH)}, particle size and composition will affect the bioaerosol viability and eventually lifetime. Bioaerosols can act as cloud condensation nuclei (CCN) or as ice nucleating particles (INP), and may affect cloud microphysics. We studied the abundance and variability of PBAP in and above cloud capped boundary layers onboard the CIRPAS Twin Otter using the Wideband Bioaerosol Integrated Sensor (WIBS) (Perring et al., 2015; Ziemba et., al 2016; Twohy et al., 2016) and a wet-wall cyclone sampler (SpinCon II) during the BOAS 2015 campaign. In addition, WIBS-4A sampled through a Counterflow Virtual Impactor (CVI) in cloud to study the presence and population composition of bioaerosols in cloud droplets. WIBS-4A data was used to quantify the abundance of FBAP and SpinCon II samples were post-processed by flow cytometry (FCM) to quantify the total PBAP concentration. Results show a persistent enrichment of bacteria in the detrainment region of the boundary layer, by which the total PBAP can constitute up to 30% of the total coarse mode particles above 500nm, with important implications for the biogeography of PBAP. Results suggest that a substantial amount (~104 m-3) of sea-spray aerosolized bacteria reaches cloud formation relevant altitudes. The abundance variability of WIBS-4A FBAP categories (e.g. A, B, C, AB, BC AC, ABC) below cloud, above the boundary layer and in the cloud drop residuals are used to study the lifecycle of bioaerosols within the boundary layer.