Zur Kurzanzeige

dc.contributor.author
Wagner, Nicholas L.
dc.contributor.author
Brock, Charles A.
dc.contributor.author
Angevine, Wayne M.
dc.contributor.author
Beyersdorf, Andreas
dc.contributor.author
Campuzano-Jost, Pedro
dc.contributor.author
Day, D.
dc.contributor.author
De Gouw, Joost A.
dc.contributor.author
Diskin, Glenn S.
dc.contributor.author
Gordon, T.D.
dc.contributor.author
Graus, Martin G.
dc.contributor.author
Holloway, J.S.
dc.contributor.author
Huey, Greg
dc.contributor.author
Jimenez, Jose-Luis
dc.contributor.author
Lack, D.A.
dc.contributor.author
Liao, J.
dc.contributor.author
Liu, X.
dc.contributor.author
Markovic, Milos Z.
dc.contributor.author
Middlebrook, Ann M.
dc.contributor.author
Mikoviny, Tomas
dc.contributor.author
Peischl, Jeff
dc.contributor.author
Perring, Anne E.
dc.contributor.author
Richardson, Mathews S.
dc.contributor.author
Ryerson, Thomas B.
dc.contributor.author
Schwarz, Joshua P.
dc.contributor.author
Warneke, Carsten
dc.contributor.author
Welti, Andre
dc.contributor.author
Wisthaler, Armin
dc.contributor.author
Ziemba, L.D.
dc.contributor.author
Murphy, Daniel M.
dc.date.accessioned
2018-10-30T11:27:49Z
dc.date.available
2017-06-11T18:32:40Z
dc.date.available
2018-10-30T11:27:49Z
dc.date.issued
2015
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-15-7085-2015
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/102825
dc.identifier.doi
10.3929/ethz-b-000102825
dc.description.abstract
Vertical profiles of submicron aerosol from in situ aircraft-based measurements were used to construct aggregate profiles of chemical, microphysical, and optical properties. These vertical profiles were collected over the southeastern United States (SEUS) during the summer of 2013 as part of two separate field studies: the Southeast Nexus (SENEX) study and the Study of Emissions and Atmospheric Composition, Clouds, and Climate Coupling by Regional Surveys (SEAC4RS). Shallow cumulus convection was observed during many profiles. These conditions enhance vertical transport of trace gases and aerosol and create a cloudy transition layer on top of the sub-cloud mixed layer. The trace gas and aerosol concentrations in the transition layer were modeled as a mixture with contributions from the mixed layer below and the free troposphere above. The amount of vertical mixing, or entrainment of air from the free troposphere, was quantified using the observed mixing ratio of carbon monoxide (CO). Although the median aerosol mass, extinction, and volume decreased with altitude in the transition layer, they were ~10 % larger than expected from vertical mixing alone. This enhancement was likely due to secondary aerosol formation in the transition layer. Although the transition layer enhancements of the particulate sulfate and organic aerosol (OA) were both similar in magnitude, only the enhancement of sulfate was statistically significant. The column integrated extinction, or aerosol optical depth (AOD), was calculated for each individual profile, and the transition layer enhancement of extinction typically contributed less than 10 % to the total AOD. Our measurements and analysis were motivated by two recent studies that have hypothesized an enhanced layer of secondary aerosol aloft to explain the summertime enhancement of AOD (2–3 times greater than winter) over the southeastern United States. The first study attributes the layer aloft to secondary organic aerosol (SOA) while the second study speculates that the layer aloft could be SOA or secondary particulate sulfate. In contrast to these hypotheses, the modest enhancement we observed in the transition layer was not dominated by OA and was not a large fraction of the summertime AOD.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
In situ vertical profiles of aerosol extinction, mass, and composition over the southeast United States during SENEX and SEAC4RS: observations of a modest aerosol enhancement aloft
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2015-06-30
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
15
en_US
ethz.journal.issue
12
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
7085
en_US
ethz.pages.end
7102
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
004294181
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-11T18:33:11Z
ethz.source
ECIT
ethz.identifier.importid
imp593653598546367817
ethz.ecitpid
pub:160983
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-12T17:42:27Z
ethz.rosetta.lastUpdated
2018-10-30T11:27:56Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=In%20situ%20vertical%20profiles%20of%20aerosol%20extinction,%20mass,%20and%20composition%20over%20the%20southeast%20United%20States%20during%20SENEX%20and%20SEAC4RS:%20o&rft.jtitle=Atmospheric%20Chemistry%20and%20Physics&rft.date=2015&rft.volume=15&rft.issue=12&rft.spage=7085&rft.epage=7102&rft.issn=1680-7375&1680-7367&rft.au=Wagner,%20Nicholas%20L.&Brock,%20Charles%20A.&Angevine,%20Wayne%20M.&Beyersdorf,%20Andreas&Campuzano-Jost,%20Pedro&rft.genre=article&
 Suchen via SFX

Dateien zu diesem Eintrag

Thumbnail

Publikationstyp

Zur Kurzanzeige