DOI: 10.1175/JCLI-D-17-0392.1
Scopus记录号: 2-s2.0-85047065007
论文题名: Multiscale variability in North American summer maximum temperatures and modulations from the North Atlantic simulated by an AGCM
作者: Vigaud N. ; Ting M. ; Lee D.-E. ; Barnston A.G. ; Kushnir Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 7 起始页码: 2549
结束页码: 2562
语种: 英语
英文关键词: Classification
; Interannual variability
; Intraseasonal variability
; Multidecadal variability
; Numerical analysis/modeling
Scopus关键词: Classification (of information)
; Climate change
; Interannual variability
; Intraseasonal variability
; K - means clustering
; Multidecadal variability
; Multiscale variability
; Numerical analysis/modeling
; Temperature anomaly
; Tropospheric warming
; Oceanography
; Atlantic Multidecadal Oscillation
; atmospheric general circulation model
; climate classification
; climate modeling
; heat wave
; high temperature
; numerical model
; sea surface temperature
; summer
; temporal variation
; warming
; air temperature
; annual variation
; classification
; decadal variation
; seasonal variation
; temperature anomaly
; thermal regime
; Atlantic Ocean
; Atlantic Ocean (North)
; United States
; Asia
; Europe
英文摘要: Six recurrent thermal regimes are identified over continental North America from June to September through a k-means clustering applied to daily maximum temperature simulated by ECHAM5 forced by historical SSTs for 1930-2013 and validated using NCEP-DOE AMIP-II reanalysis over the 1980-2009 period. Four regimes are related to a synoptic wave pattern propagating eastward in the midlatitudes with embedded ridging anomalies that translate into maximum warming transiting along. Two other regimes, associated with broad continental warming and above average temperatures in the northeastern United States, respectively, are characterized by ridging anomalies over North America, Europe, and Asia that suggest correlated heat wave occurrences in these regions. Their frequencies are mainly related to both La Niña and warm conditions in the North Atlantic. Removing all variability beyond the seasonal cycle in the North Atlantic in ECHAM5 leads to a significant drop in the occurrences of the regime associated with warming in the northeastern United States. Superimposing positive (negative) anomalies mimicking the Atlantic multidecadal variability (AMV) in the North Atlantic translates into more (less) warming over the United States across all regimes, and does alter regime frequencies but less significantly. Regime frequency changes are thus primarily controlled by Atlantic SST variability on all time scales beyond the seasonal cycle, rather than mean SST changes, whereas the intensity of temperature anomalies is impacted by AMV SST forcing, because of upper-tropospheric warming and enhanced stability suppressing rising motion during the positive phase of the AMV. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111594
Appears in Collections: 气候减缓与适应
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作者单位: International Research Institute for Climate and Society, Earth Institute at Columbia University, Palisades, NY, United States; Lamont-Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, NY, United States
Recommended Citation:
Vigaud N.,Ting M.,Lee D.-E.,et al. Multiscale variability in North American summer maximum temperatures and modulations from the North Atlantic simulated by an AGCM[J]. Journal of Climate,2018-01-01,31(7)