학술논문
Emission of primary bioaerosol particles from Baltic seawaterElectronic supplementary information (ESI) available: The document includes details on the auxiliary aerosol size spectrometers; data processing; concentration calculations; description of laboratory experiments; shiptrack of the EMB184 campaign; experimental setup of the SSSC; photos of EMB184 campaign; overview of the particle size distributions of nascent sea spray; fluorescence spectra of EMB184 particle classes; timeline of particle classes contribution; period size-resolved particle classes contribution; table of PBAP and HFSSA contribution to coarse mode per size; comparison between EMB184 and laboratory experiments size distribution; particle classes classification of laboratory experiments; comparison of the fluorescence spectra from the different retrieved groups to literature values; timelines of various aerosol, seawater and ambient parameters; comparison between integral normalized number size distributions for c
Document Type
Article
Author
Source
Environmental Science: Atmospheres; 2022, Vol. 2 Issue: 5 p1170-1182, 13p
Subject
Language
ISSN
26343606
Abstract
Bioaerosols are particles of biological origin with various important atmospheric implications, for example, within cloud formation where bioaerosols can act as cloud condensation or ice nuclei. Their sources and properties, however, are poorly understood. We conducted a controlled sea spray experiment to determine the properties and emission of primary biological aerosol particles (PBAP) originating from Baltic seawater. Using a single-particle fluorescence and light-scattering instrument, the Multiparameter Bioaerosol Spectrometer (MBS), we differentiated PBAP within sea spray aerosol (SSA). Overall, approximately 1 in 104particles larger than 0.8 μm in diameter were classified as PBAP. The optically-determined morphology of the nascent and fluorescent SSA particles showed a clear transition in symmetry and elongation most likely due to changes in the biogeochemical properties of the surface water. These shifts were also reflected in a clear change of the bacterial community composition of the aerosol and seawater as determined by 16S rRNA-gene analysis, which were significantly distinct from each other, suggesting a preferential emission of specific bacteria to the atmosphere. Our results demonstrate the capability of the MBS to identify and count PBAP within SSA on a single-particle basis and will help to better constrain the emission of marine PBAP and their dependence on the seawater's biogeochemical properties.