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dc.contributor.author
Sanchez-Lorenzo, Arturo
dc.contributor.author
Calbó, Josep
dc.date.accessioned
2019-06-25T14:56:45Z
dc.date.available
2017-06-10T08:58:24Z
dc.date.available
2019-06-25T14:56:45Z
dc.date.issued
2012
dc.identifier.issn
1814-9324
dc.identifier.issn
1814-9332
dc.identifier.other
10.5194/cp-8-1199-2012
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/55609
dc.identifier.doi
10.3929/ethz-b-000055609
dc.description.abstract
Visual observations of clouds have been performed since the establishment of meteorological observatories during the early instrumental period, and have become more systematic and reliable after the mid-19th century due to the establishment of the first national weather services. During the last decades a large number of studies have documented the trends of the total cloud cover (TCC) and cloudy types; most of these studies focus on the trends since the second half of the 20th century. Due to the lower reliability of former observations, and the fact that most of this data is not accessible in digital format, there is a lack of studies focusing on the trends of cloudiness since the mid-19th century. In the first part, this work attempts to review previous studies analyzing TCC changes with information covering at least the first half of the 20th century. Then, the study analyses a database of cloudiness observations in Southern Europe (Spain) since the second half of the 19th century. Specifically, monthly TCC series were reconstructed since 1866 by means of a so-called parameter of cloudiness, calculated from the number of cloudless and overcast days. These estimated TCC series show a high interannual and decadal correlation with the observed TCC series originally measured in oktas. After assessing the temporal homogeneity of the estimated TCC series, the mean annual and seasonal series for the whole of Spain and several subregions were calculated. The mean annual TCC shows a general tendency to increase from the beginning of the series until the 1960s; at this point, the trend becomes negative. The linear trend for the annual mean series, estimated over the 1866–2010 period, is a highly remarkable (and statistically significant) increase of +0.44% per decade, which implies an overall increase of more than +6% during the analyzed period. These results are in line with the majority of the trends observed in many areas of the world in previous studies, especially for the records before the 1950s when a widespread increase of TCC can been considered as a common feature.
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
Increasing cloud cover in the 20th century: review and new findings in Spain
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2012-07-20
ethz.journal.title
Climate of the Past
ethz.journal.volume
8
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
Clim. past
ethz.pages.start
1199
en_US
ethz.pages.end
1212
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
005583758
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::03360 - Schär, Christoph / Schär, Christoph
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::03360 - Schär, Christoph / Schär, Christoph
ethz.date.deposited
2017-06-10T09:00:31Z
ethz.source
ECIT
ethz.identifier.importid
imp59364fc18604296372
ethz.ecitpid
pub:89592
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-15T08:51:58Z
ethz.rosetta.lastUpdated
2019-06-25T14:57:12Z
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Increasing%20cloud%20cover%20in%20the%2020th%20century:%20review%20and%20new%20findings%20in%20Spain&rft.jtitle=Climate%20of%20the%20Past&rft.date=2012&rft.volume=8&rft.issue=4&rft.spage=1199&rft.epage=1212&rft.issn=1814-9324&1814-9332&rft.au=Sanchez-Lorenzo,%20Arturo&Calb%C3%B3,%20Josep&rft.genre=article&
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