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dc.contributor.authorHarshvardhan, Harshvardhan
dc.contributor.authorFerrare, Richard A.
dc.contributor.authorBurton, Sharon P.
dc.contributor.authorHair, J. W.
dc.contributor.authorHostetler, Chris A.
dc.contributor.authorHarper, David B.
dc.contributor.authorCook, Anthony
dc.contributor.authorFenn, Martha A.
dc.contributor.authorScarino, Amy Jo
dc.contributor.authorChemyakin, Eduard V.
dc.contributor.authorMüller, Detlef
dc.date.accessioned2022-08-09T14:15:02Z
dc.date.available2022-08-09T14:15:02Z
dc.date.issued2022-08-03
dc.identifier.citationHarshvardhan , H , Ferrare , R A , Burton , S P , Hair , J W , Hostetler , C A , Harper , D B , Cook , A , Fenn , M A , Scarino , A J , Chemyakin , E V & Müller , D 2022 , ' Vertical structure of biomass burning aerosol transported over the southeast Atlantic Ocean ' , Atmospheric Chemistry and Physics , vol. 22 , pp. 9859–9876 . https://doi.org/10.5194/acp-22-9859-2022
dc.identifier.issn1680-7316
dc.identifier.otherORCID: /0000-0002-0203-7654/work/117176398
dc.identifier.urihttp://hdl.handle.net/2299/25710
dc.description© Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.
dc.description.abstractBiomass burning in southwestern Africa produces smoke plumes that are transported over the Atlantic Ocean and overlie vast regions of stratocumulus clouds. This aerosol layer contributes to direct and indirect radiative forcing of the atmosphere in this region, particularly during the months of August, September and October. There was a multi-year international campaign to study this aerosol and its interactions with clouds. Here we report on the evolution of aerosol distributions and properties as measured by the airborne high spectral resolution lidar (HSRL) during the ORACLES (Observations of Aerosols above Clouds and their intEractionS) campaign in September 2016. The NASA Langley HSRL-2 instrument was flown on the NASA ER-2 aircraft for several days in September 2016. Data were aggregated at two pairs of 2°×2° grid boxes to examine the evolution of the vertical profile of aerosol properties during transport over the ocean. Results showed that the structure of the profile of aerosol extinction and microphysical properties is maintained over a one to two-day time scale. The fraction of aerosol in the fine mode between 50 and 500 nm remained above 0.95 and the effective radius of this fine mode was 0.16 μm from 3 to 5 km in altitude. This indicates that there is essentially no scavenging or dry deposition at these altitudes. Moreover, there is very little day to day variation in these properties, such that time sampling as happens in such campaigns, may be 24 representative of longer periods such as monthly means. Below 3 km there is considerable mixing with larger aerosol, most likely continental source near land. Furthermore, these measurements indicated that there was a distinct gap between the bottom of the aerosol layer and cloud tops at the selected locations as evidenced by a layer of several hundred meters that contained relatively low aerosol extinction values above the clouds.en
dc.format.extent10934408
dc.format.extent5503161
dc.language.isoeng
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.titleVertical structure of biomass burning aerosol transported over the southeast Atlantic Oceanen
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecord10.5194/acp-22-9859-2022
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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