http://www.sciencedirect.com/science/article/pii/S2451929417301201?via%3Dihub
Chem <http://www.sciencedirect.com/science/journal/24519294> 11 May 2017, Vol.2(5) <http://www.sciencedirect.com/science/journal/24519294/2/5>:655–667, doi: 10.1016/j.chempr.2017.03.007 <http://dx.doi.org/10.1016/j.chempr.2017.03.007> Article Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity - Richard E. Cochran - Olga Laskina - Vicki H. Grassian Show more <http://www.sciencedirect.com/science/article/pii/S2451929417301201?via%3Dihub#> ------------------------------ Highlights - • The molecular composition of individual nascent SSA particles is diverse - • Molecular diversity of individual SSA particles is controlled by the microbial loop - • Changes in hygroscopicity of SSA are driven by shifts in particle composition The Bigger Picture Sea spray aerosol (SSA) particles are an important component of Earth’s atmosphere in that they serve as a critical link between the ocean and climate. The key to understanding how SSA affects climate is to unravel the chemical composition and the molecular diversity among individual SSA particles and determine how this influences their climate properties, including particle hygroscopicity. Here, we measured the molecular composition and hygroscopicity of individual SSA particles that were produced in a unique wave-flume facility during periods of dynamic biological activity in seawater. With respect to molecular composition, the number distribution of SSA particle types was seen to be influenced by these biological processes within the seawater. Shifts in the distribution of different particles types led to changes in the average particle hygroscopicity; these changes were further explored via evaluation of the hygroscopicity of model systems containing mixtures of organic compounds and salts. Summary The impact of sea spray aerosol (SSA) on climate depends on the size and chemical composition of individual particles that make up the total SSA ensemble. There remains a lack of understanding as to the composition of individual particles within the SSA ensemble and how it changes in response to dynamic ocean biology. Here, we characterize the classes of organic compounds as well as specific molecules within individual SSA particles. The diversity of molecules within the organic fraction was observed to vary between submicrometer- and supermicrometer-sized particles and included contributions from fatty acids, monosaccharides, polysaccharides, and siliceous material. Significant changes in this molecular diversity were observed to coincide with the rise and fall of phytoplankton and heterotrophic bacteria populations within the seawater. Furthermore, the water uptake of individual particles was affected, as learned from studying the hygroscopicity of model systems composed of representative mixtures of salts and organic compounds. Graphical AbstractKeywords - sea spray aerosol - molecular composition - single-particle analysis - particle hygroscopicity - phytoplankton bloom - selective enrichment - bacteria - marine chemistry UN Sustainable Development Goals - SDG13: Climate action -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
