DOI: 10.1002/2015GL065656
论文题名: Recent contrasting winter temperature changes over North America linked to enhanced positive Pacific-North American pattern
作者: Liu Z. ; Jian Z. ; Yoshimura K. ; Buenning N.H. ; Poulsen C.J. ; Bowen G.J.
刊名: Geophysical Research Letters
ISSN: 0094-9316
EISSN: 1944-9047
出版年: 2015
卷: 42, 期: 18 起始页码: 7750
结束页码: 7757
语种: 英语
英文关键词: North America
; Pacific and North American
; spatial pattern
; temperature extremes
; temperature trends
Scopus关键词: Geophysics
; North America
; North American
; Spatial patterns
; Temperature extremes
; Temperature trends
; Earth sciences
; cold air
; data set
; planetary wave
; spatial analysis
; temperature effect
; winter
; North America
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Recently 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. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945485859&doi=10.1002%2f2015GL065656&partnerID=40&md5=002b08afa686695d29a2a5e9ed9769d2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8931
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai, China
Recommended Citation:
Liu Z.,Jian Z.,Yoshimura K.,et al. Recent contrasting winter temperature changes over North America linked to enhanced positive Pacific-North American pattern[J]. Geophysical Research Letters,2015-01-01,42(18).