On Aerosol Liquid Water and Sulfate Associations: The Potential for Fine Particulate Matter Biases

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dc.contributor.authorBabila, Jonathon E.
dc.contributor.authorCarlton, Annmarie G.
dc.contributor.authorHennigan, Christopher J.
dc.contributor.authorGhate, Virendra P.
dc.date.accessioned2020-03-24T15:36:58Z
dc.date.available2020-03-24T15:36:58Z
dc.date.issued2020-02-12
dc.description.abstractIn humid locations of the Eastern U.S., sulfate is a surrogate for aerosol liquid water (ALW), a poorly measured particle constituent. Regional and seasonal variation in ALW–sulfate relationships offers a potential explanation to reconcile epidemiology and toxicology studies regarding particulate sulfur and health endpoints. ALW facilitates transfer of polar species from the gas phase to the particle phase and affects particle pH and metal oxidation state. Though abundant and a potential indicator of adverse health endpoints, ALW is largely removed in most particulate matter measurement techniques, including in routine particulate matter (PM₂.₅) networks that use federal reference method (FRM) monitors, which are used in epidemiology studies. We find that in 2004, a typical year in the available record, ambient ALW mass is removed during sampling and filter equilibration to standard laboratory conditions at most (94%) sites, up to 85% of the ambient water mass. The removal of ALW can induce the evaporation of other semi-volatile compounds present in PM₂.₅, such as ammonium nitrate and numerous organics. This produces an artifact in the PM mass measurements that is, importantly, not uniform in space or time. This suggests that PM₂.₅ epidemiology studies that exclude ALW are biased. This work provides a plausible explanation to resolve multi-decade discrepancies regarding ambient sulfate and health impacts in some epidemiological and toxicological studies.en_US
dc.description.sponsorshipThis research was funded, in part by NSF grant numbers #1719252 and #1719245, NASA grant number #80NSSC19K0987.en_US
dc.description.urihttps://www.mdpi.com/2073-4433/11/2/194en_US
dc.format.extent11 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ft43-whbg
dc.identifier.citationBabila, Jonathon E.; Carlton, Annmarie G.; Hennigan, Christopher J.; Ghate, Virendra P.; On Aerosol Liquid Water and Sulfate Associations: The Potential for Fine Particulate Matter Biases; Atmosphere 11,2 (2020); https://www.mdpi.com/2073-4433/11/2/194en_US
dc.identifier.urihttps://doi.org/10.3390/atmos11020194
dc.identifier.urihttp://hdl.handle.net/11603/17612
dc.language.isoen_USen_US
dc.publisherMDPIen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Chemical, Biochemical & Environmental Engineering Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 4.0 International (CC BY 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.titleOn Aerosol Liquid Water and Sulfate Associations: The Potential for Fine Particulate Matter Biasesen_US
dc.typeTexten_US

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