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dc.contributor.author
Stevens, Bjorn
dc.contributor.author
Bony, Sandrine
dc.contributor.author
Brogniez, Hélène
dc.contributor.author
Hentgen, Laureline
dc.contributor.author
Hohenegger, Cathy
dc.contributor.author
Kiemle, Christoph
dc.contributor.author
L'Ecuyer, Tristan S.
dc.contributor.author
Naumann, Ann K.
dc.contributor.author
Schulz, Hauke
dc.contributor.author
Siebesma, Pier A.
dc.contributor.author
Vial, Jessica
dc.contributor.author
Winker, Dave M.
dc.contributor.author
Zuidema, Paquita
dc.date.accessioned
2020-02-17T14:04:37Z
dc.date.available
2020-01-26T05:57:05Z
dc.date.available
2020-01-27T08:40:32Z
dc.date.available
2020-02-17T14:04:37Z
dc.date.issued
2020-01
dc.identifier.issn
0035-9009
dc.identifier.issn
1477-870X
dc.identifier.other
10.1002/qj.3662
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/394019
dc.identifier.doi
10.3929/ethz-b-000394019
dc.description.abstract
An activity designed to characterise patterns of mesoscale (20 to 2,000 km) organisation of shallow clouds in the downstream trades is described. Patterns of mesoscale organisation observed from space were subjectively defined and learned by 12 trained scientists. The ability of individuals to communicate, learn and replicate the classification was evaluated. Nine‐hundred satellite images spanning the area from 48°W to 58°W, 10°N to 20°N for the boreal winter months (December–February) over 10 years (2007/2008 to 2016/2017) were classified. Each scene was independently labelled by six scientists as being dominated by one of six patterns (one of which was “no‐pattern”). Four patterns of mesoscale organisation could be labelled in a reproducible manner, and were labelled Sugar, Gravel, Fish and Flowers. Sugar consists of small, low clouds of low reflectivity, Gravel clouds form along apparent gust fronts, Fish are skeletal networks (often fishbone‐like) of clouds, while Flowers are circular clumped features defined more by their stratiform cloud elements. Both Fish and Flowers are surrounded by large areas of clear air. These four named patterns were identified 40% of the time, with the most common pattern being Gravel. Sugar was identified the least and suggests that unorganised and very shallow convection is unlikely to dominate large areas of the downstream trade winds. Some of the patterns show signs of seasonal and interannual variability, and some degree of scale selectivity. Comparison of typical patterns with radar imagery suggests that even this subjective and qualitative visual inspection of imagery appears to capture several important physical differences between shallow cloud regimes, such as precipitation and radiative effects.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
cloud feedbacks
en_US
dc.subject
mesoscale organisation
en_US
dc.subject
shallow convection
en_US
dc.subject
trade clouds
en_US
dc.title
Sugar, gravel, fish and flowers: Mesoscale cloud patterns in the trade winds
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2019-09-16
ethz.journal.title
Quarterly Journal of the Royal Meteorological Society
ethz.journal.volume
146
en_US
ethz.journal.issue
726
en_US
ethz.journal.abbreviated
Q J R Meteorol Soc.
ethz.pages.start
141
en_US
ethz.pages.end
152
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Oxford
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::03360 - Schär, Christoph (emeritus) / Schär, Christoph (emeritus)
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::03360 - Schär, Christoph (emeritus) / Schär, Christoph (emeritus)
ethz.date.deposited
2020-01-26T05:57:08Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-02-17T14:05:05Z
ethz.rosetta.lastUpdated
2024-02-02T10:26:34Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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