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Recent contrasting winter temperature changes over North America linked to enhanced positive Pacific‐North American pattern

dc.contributor.authorLiu, Zhongfangen_US
dc.contributor.authorJian, Zhiminen_US
dc.contributor.authorYoshimura, Keien_US
dc.contributor.authorBuenning, Nikolaus H.en_US
dc.contributor.authorPoulsen, Christopher J.en_US
dc.contributor.authorBowen, Gabriel J.en_US
dc.date.accessioned2015-11-12T21:04:10Z
dc.date.available2016-11-01T16:43:14Zen
dc.date.issued2015-09-28en_US
dc.identifier.citationLiu, Zhongfang; Jian, Zhimin; Yoshimura, Kei; Buenning, Nikolaus H.; Poulsen, Christopher J.; Bowen, Gabriel J. (2015). "Recent contrasting winter temperature changes over North America linked to enhanced positive Pacific‐North American pattern." Geophysical Research Letters 42(18): 7750-7757.en_US
dc.identifier.issn0094-8276en_US
dc.identifier.issn1944-8007en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/115952
dc.description.abstractRecently enhanced contrasts in winter (December‐January‐February) mean temperatures and extremes (cold southeast and warm northwest) across North America have triggered intensive discussion both within and outside of the scientific community, but the mechanisms responsible for these contrasts remain unresolved. Here we use a combination of observations and reanalysis data sets to show that the strengthened contrasts in winter mean temperatures and extremes across North America are closely related to an enhancement of the positive Pacific‐North American (PNA) pattern during the second half of the 20th century. Recent intensification of positive PNA events is associated with amplified planetary waves over North America, driving cold‐air outbreaks into the southeast and warm tropical/subtropical air into the northwest. This not only results in a strengthened winter mean temperature contrast but increases the occurrence of the opposite‐signed extremes in these two regions.Key PointsThe enhanced contrasts in winter mean temperatures and extremes in North America are observedRecent enhancement of positive PNA is a main cause of the contrasting winter temperature changesThe study provides a framework for detection and attribution of climate change in North Americaen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.othertemperature trendsen_US
dc.subject.othertemperature extremesen_US
dc.subject.otherspatial patternen_US
dc.subject.otherPacific and North Americanen_US
dc.subject.otherNorth Americaen_US
dc.titleRecent contrasting winter temperature changes over North America linked to enhanced positive Pacific‐North American patternen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelGeological Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/115952/1/grl53404_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/115952/2/grl53404.pdf
dc.identifier.doi10.1002/2015GL065656en_US
dc.identifier.sourceGeophysical Research Lettersen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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