Show simple item record

dc.contributor.author
Crumeyrolle, Suzanne
dc.contributor.author
Mensah, Amewu A.
dc.contributor.author
Khlystov, Andrey
dc.contributor.author
Kos, Gerard
dc.contributor.author
ten Brink, Harry
dc.date.accessioned
2021-03-15T08:42:59Z
dc.date.available
2021-03-15T05:24:28Z
dc.date.available
2021-03-15T08:42:59Z
dc.date.issued
2021-05-01
dc.identifier.issn
1352-2310
dc.identifier.issn
0004-6981
dc.identifier.issn
1352-3260
dc.identifier.other
10.1016/j.atmosenv.2021.118278
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/474400
dc.identifier.doi
10.3929/ethz-b-000474400
dc.description.abstract
Anthropogenic aerosol particles serve as extra Cloud Condensation Nuclei (CCN), increasing the cloud droplet number concentration and modifying the cloud properties. The influence of manmade aerosol is the highest in a marine environment due to a limited number of natural CCN. Marine stratocumulus-like clouds (MSC) are the most frequent cloud-type in the North Sea region. The general assumption is that sulphate is the dominant compound of the CCN. However, high levels of manmade nitrate in the area suggest a significant role for this component. We made a first assessment of how many CCN with a marine origin were dominated by nitrate via two intensive campaigns in a large flow-through cloud chamber at the coast in the Netherlands wherein the formation of stratocumulus is simulated. It was consistently observed that the CCN were virtually all in the submicron range. In marine air masses from the NW-quadrant submicron nitrate was negligible and sulphate was the dominant CCN-component; this was also the case in air masses that passed over the narrow corridor of the English Channel. In air masses from the SW quadrant, climatologically the most frequent air mass with stratus-like overcast, submicron-nitrate was the dominant compound apparently produced from sources located over southern UK and W-France/Belgium. The CCN were mostly (98%) in the size range of 100–450 nm. During the summer campaign (2007), nitrate was virtually absent in the smaller and more numerous CCN in this size range. During a, shorter, study in the first half of April (2009), all CCN were dominated by nitrate. This possible seasonal difference in the role of nitrate in SW-air was the main subject evaluated in a monitoring effort in 2008 with a total of 7 months of valid data. The mass concentration ratio of nitrate to sulphate in the “CCN”-range (the range in which 85% of the CCN number concentration is present) was used to identify the periods when nitrate was the prominent compound. In winter/early spring CCN-nitrate was the dominant compound in the CCN, while during summer the ratio of CCN-nitrate to CCN-sulphate was 0.2 and close to zero in the CCN with a diameter smaller than 150 nm. This seasonal difference can be explained by the low stability of the semi-volatile ammonium nitrate at the elevated temperatures in summer, which specifically applies for the smallest CCN due to their small mass amounts. Further data are required to obtain a reliable climatology. Note: sea salt contributed negligibly to the CCN-number; organic aerosol, measured in the April campaign, was present in significant concentrations but of minor importance because of its low hygroscopicity.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Nitrate
en_US
dc.subject
Clouds
en_US
dc.subject
Droplet number
en_US
dc.subject
Activation
en_US
dc.subject
Cloud chambe
en_US
dc.subject
MARGA-Sizer
en_US
dc.title
On the importance of nitrate for the droplet concentration in stratocumulus in the North-Sea region
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2021-03-03
ethz.journal.title
Atmospheric Environment
ethz.journal.volume
252
en_US
ethz.journal.abbreviated
Atmos. environ.
ethz.pages.start
118278
en_US
ethz.size
9 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-03-15T05:24:41Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-15T08:43:17Z
ethz.rosetta.lastUpdated
2022-03-29T05:45:39Z
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=On%20the%20importance%20of%20nitrate%20for%20the%20droplet%20concentration%20in%20stratocumulus%20in%20the%20North-Sea%20region&rft.jtitle=Atmospheric%20Environment&rft.date=2021-05-01&rft.volume=252&rft.spage=118278&rft.issn=1352-2310&0004-6981&1352-3260&rft.au=Crumeyrolle,%20Suzanne&Mensah,%20Amewu%20A.&Khlystov,%20Andrey&Kos,%20Gerard&ten%20Brink,%20Harry&rft.genre=article&rft_id=info:doi/10.1016/j.atmosenv.2021.118278&
 Search print copy at ETH Library

Files in this item

Thumbnail

Publication type

Show simple item record