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dc.contributor.authorParding, Kajsa
dc.contributor.authorLiepert, Beate G.
dc.contributor.authorHinkelman, Laura M.
dc.contributor.authorAckerman, Thomas P.
dc.contributor.authorDagestad, Knut-Frode
dc.contributor.authorOlseth, Jan Asle
dc.date.accessioned2017-04-04T12:19:36Z
dc.date.available2017-04-04T12:19:36Z
dc.date.issued2016-05
dc.PublishedJournal of Climate 2016, 29:4229-4250eng
dc.identifier.issn1520-0442en_US
dc.identifier.urihttps://hdl.handle.net/1956/15663
dc.description.abstractObservations have revealed strong variability of shortwave (SW) irradiance at Earth’s surface on decadal time scales, referred to as global dimming and brightening. Previous studies have attributed the dimming and brightening to changes in clouds and atmospheric aerosols. This study assesses the influence of atmospheric circulation on clouds and SW irradiance to separate the influence of ‘‘natural’’ SW variability from direct and, to some extent, indirect aerosol effects. The focus is on SW irradiance in northern Europe in summer and spring because there is little high-latitude SW irradiance during winter. As a measure of large-scale circulation the Grosswetterlagen (GWL) dataset, a daily classi- fication of synoptic weather patterns, is used. Empirical models of normalized SW irradiance are constructed based on the GWL, relating the synoptic weather patterns to the local radiative climate. In summer, a temporary SW peak in the 1970s and subsequent dimming is linked to variations in the synoptic patterns over Scandinavia, possibly related to a northward shift in the North Atlantic storm track. In spring, a decrease of anticyclonic and increase of cyclonic weather patterns over northern Europe contributes to the dimming from the 1960s to 1990. At many sites, there is also a residual SWirradiance trend not explained by the GWL model: a weak nonsignificant residual dimming from the 1950s or 1960s to around 1990, followed by a statistically significant residual brightening. It is concluded that factors other than the large-scale circulation (e.g., decreasing aerosol emissions) also play an important role in northern Europe.en_US
dc.language.isoengeng
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttp://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-15-0476.1
dc.rightsAttribution CC BYeng
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/eng
dc.subjectAtm/Ocean Structure/ Phenomenaeng
dc.subjectSynoptic-scale processeseng
dc.subjectPhysical Meteorology and Climatologyeng
dc.subjectClimate variabilityeng
dc.subjectShortwave radiationeng
dc.subjectVariabilityeng
dc.subjectDecadal variabilityeng
dc.subjectMultidecadal variabilityeng
dc.subjectTrendseng
dc.titleInfluence of synoptic weather patterns on solar irradiance variability in northern Europeen_US
dc.typePeer reviewed
dc.typeJournal article
dc.date.updated2016-12-14T09:16:38Z
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2016 the authorsen_US
dc.identifier.doihttps://doi.org/10.1175/jcli-d-15-0476.1


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