Estimated timescales for wet deposition of organic compounds as a function of Henry's law constants

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dc.contributor.authorBi, Chenyangen
dc.contributor.authorIsaacman-VanWertz, Gabrielen
dc.date.accessioned2023-05-02T13:42:26Zen
dc.date.available2023-05-02T13:42:26Zen
dc.date.issued2022-11en
dc.description.abstractAtmospheric organic compounds may deposit to Earth's surfaces via dry deposition, driven by concentration gradients, and wet deposition, driven by the scavenging of compounds by precipitation. Their removal by deposition has downstream impacts on concentrations of secondary organic aerosol by removing potential aerosol precursors that would otherwise oxidize to form particulate matter. The impact of deposition processes can consequently be considered as competition between rates of oxidation and deposition, but timescales for deposition are not well constrained. While timescales for dry deposition have been estimated and experimentally validated in the past, understanding of wet deposition of organics is still very limited. In this work, we estimate the wet deposition timescale for gas-phase organic compounds in the atmosphere as a function of Henry's law constants, H, using real-world precipitation frequency and size distributions at five globally-distributed sites. The wet deposition timescale decreases significantly with the increase of H until reaching a stable minimum for compounds with H > 10(5) M per atm. We estimate that the median wet deposition timescale for highly soluble gases is approximately 5 hours during a continuous rain event for all sites. However, median estimated timescales ranged from 80 to 200 hours, depending on location. Timescales are found to depend primarily on the frequency and duration of precipitation events rather than their intensity or size characteristics. Based on these data, we demonstrate that timescales for wet deposition of gases can be estimated at any given location using only basic precipitation information, without detailed or high-precision measurements.en
dc.description.notesThis work was supported by the United States Department of Energy Office of Biological & Environmental Research (DE-SC0022020).en
dc.description.sponsorshipUnited States Department of Energy Office of Biological & Environmental Research [DE-SC0022020]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1039/d2ea00091aen
dc.identifier.eissn2634-3606en
dc.identifier.issue6en
dc.identifier.urihttp://hdl.handle.net/10919/114880en
dc.identifier.volume2en
dc.language.isoenen
dc.publisherRoyal Society Chemistryen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectEvolutionen
dc.subjectchemistryen
dc.subjectnitrogenen
dc.subjectaerosolen
dc.subjectsulfuren
dc.subjectcarbonen
dc.subjectimpacten
dc.titleEstimated timescales for wet deposition of organic compounds as a function of Henry's law constantsen
dc.title.serialEnvironmental Science-Atmospheresen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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