Atmospheric isoprene measurements reveal larger-than-expected Southern Ocean emissions

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dc.contributor.authorFerracci, Valerio
dc.contributor.authorWeber, James
dc.contributor.authorBolas, Conor G.
dc.contributor.authorRobinson, Andrew D.
dc.contributor.authorTummon, Fiona
dc.contributor.authorRodríguez-Ros, Pablo
dc.contributor.authorCortés-Greus, Pau
dc.contributor.authorBaccarini, Andrea
dc.contributor.authorJones, Roderic L.
dc.contributor.authorGalí, Martí
dc.contributor.authorSimó, Rafel
dc.contributor.authorSchmale, Julia
dc.contributor.authorHarris, Neil R. P.
dc.date.accessioned2024-03-27T12:04:01Z
dc.date.available2024-03-27T12:04:01Z
dc.date.issued2024-03-22
dc.description.abstractIsoprene is a key trace component of the atmosphere emitted by vegetation and other organisms. It is highly reactive and can impact atmospheric composition and climate by affecting the greenhouse gases ozone and methane and secondary organic aerosol formation. Marine fluxes are poorly constrained due to the paucity of long-term measurements; this in turn limits our understanding of isoprene cycling in the ocean. Here we present the analysis of isoprene concentrations in the atmosphere measured across the Southern Ocean over 4 months in the summertime. Some of the highest concentrations ( >500 ppt) originated from the marginal ice zone in the Ross and Amundsen seas, indicating the marginal ice zone is a significant source of isoprene at high latitudes. Using the United Kingdom Earth System Model we show that current estimates of sea-to-air isoprene fluxes underestimate observed isoprene by a factor >20. A daytime source of isoprene is required to reconcile models with observations. The model presented here suggests such an increase in isoprene emissions would lead to >8% decrease in the hydroxyl radical in regions of the Southern Ocean, with implications for our understanding of atmospheric oxidation and composition in remote environments, often used as proxies for the pre-industrial atmosphere.en_UK
dc.description.sponsorshipV.F. and N.R.P.H. were supported in the analysis of the data by UKRI NERC project Southern Ocean Clouds (NE/T006366/1).en_UK
dc.identifier.citationFerracci V, Weber J, Bolas CG, et al., (2024) Atmospheric isoprene measurements reveal larger-than-expected Southern Ocean emissions. Nature Communications, Volume 15, Issue 1, March 2024, Article Number 2571en_UK
dc.identifier.eissn2041-1723
dc.identifier.urihttps://doi.org/10.1038/s41467-024-46744-4
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21099
dc.language.isoen_UKen_UK
dc.publisherSpringer Natureen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleAtmospheric isoprene measurements reveal larger-than-expected Southern Ocean emissionsen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2024-03-05

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