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dc.contributor.author
Ryder, Claire L.
dc.contributor.author
Highwood, Ellie J.
dc.contributor.author
Rosenberg, Philip D.
dc.contributor.author
Trembath, Jamie
dc.contributor.author
Brooke, Jennifer K.
dc.contributor.author
Bart, M.
dc.contributor.author
Dean, A.
dc.contributor.author
Crosier, Jonathan
dc.contributor.author
Dorsey, James
dc.contributor.author
Brindley, Helen
dc.contributor.author
Banks, J.
dc.contributor.author
Marsham, John H.
dc.contributor.author
McQuaid, Jim B.
dc.contributor.author
Sodemann, Harald
dc.contributor.author
Washington, Richard
dc.date.accessioned
2018-10-26T09:45:54Z
dc.date.available
2017-06-10T14:13:05Z
dc.date.available
2018-10-26T09:45:54Z
dc.date.issued
2013
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acp-13-303-2013
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/63955
dc.identifier.doi
10.3929/ethz-b-000063955
dc.description.abstract
New in-situ aircraft measurements of Saharan dust originating from Mali, Mauritania and Algeria taken during the Fennec 2011 aircraft campaign over a remote part of the Sahara Desert are presented. Size distributions extending to 300 μm are shown, representing measurements extending further into the coarse mode than previously published for airborne Saharan dust. A significant coarse mode was present in the size distribution measurements with effective diameter (deff) from 2.3 to 19.4 μm and coarse mode volume median diameter (dvc) from 5.8 to 45.3 μm. The mean size distribution had a larger relative proportion of coarse mode particles than previous aircraft measurements. The largest particles (with deff > 12 μm, or dvc > 25 μm) were only encountered within 1 km of the ground. Number concentration, mass loading and extinction coefficient showed inverse relationships to dust age since uplift. Dust particle size showed a weak exponential relationship to dust age. Two cases of freshly uplifted dust showed quite different characteristics of size distribution and number concentration. Single Scattering Albed (SSA) values at 550 nm calculated from the measured size distributions revealed high absorption ranging from 0.70 to 0.97 depending on the refractive index. SSA was found to be strongly related to deff. New instrumentation revealed that direct measurements, behind Rosemount inlets, overestimate SSA by up to 0.11 when deff is greater than 2 μm. This is caused by aircraft inlet inefficiencies and sampling losses. Previous measurements of SSA from aircraft measurements may also have been overestimates for this reason. Radiative transfer calculations indicate that the range of SSAs during Fennec 2011 can lead to underestimates in shortwave atmospheric heating rates by 2.0 to 3.0 times if the coarse mode is neglected. This will have an impact on Saharan atmospheric dynamics and circulation, which should be taken into account by numerical weather prediction and climate models.
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
Optical properties of Saharan dust aerosol and contribution from the coarse mode as measured during the Fennec 2011 aircraft campaign
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2013-01-11
ethz.journal.title
Atmospheric Chemistry and Physics
ethz.journal.volume
13
en_US
ethz.journal.issue
1
en_US
ethz.journal.abbreviated
Atmos. chem. phys.
ethz.pages.start
303
en_US
ethz.pages.end
325
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.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
ethz.date.deposited
2017-06-10T14:14:24Z
ethz.source
ECIT
ethz.identifier.importid
imp5936505ec52e468311
ethz.ecitpid
pub:101388
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-18T09:47:43Z
ethz.rosetta.lastUpdated
2018-10-26T09:45:59Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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