气候变化领域集成服务门户(CCPortal): Interannual variability of North American winter temperature extremes and its associated circulation anomalies in observations and CMIP5 simulations

CCPortal

DOI	10.1175/JCLI-D-19-0404.1
	Interannual variability of North American winter temperature extremes and its associated circulation anomalies in observations and CMIP5 simulations
	Yu B.; Lin H.; Kharin V.V.; Wang X.L.
发表日期	2020
ISSN	0894-8755
起始页码	847
结束页码	865
卷号	33 期号:3
英文摘要	The interannual variability of wintertime North American surface temperature extremes and its generation and maintenance are analyzed in this study. The leading mode of the temperature extreme anomalies, revealed by empirical orthogonal function (EOF) analyses of December-February mean temperature extreme indices over North America, is characterized by an anomalous center of action over western-central Canada. In association with the leading mode of temperature extreme variability, the large-scale atmospheric circulation features an anomalous Pacific-North American (PNA)-like pattern from the preceding fall to winter, which has important implications for seasonal prediction of North American temperature extremes. A positive PNA pattern leads to more warm and fewer cold extremes over western-central Canada. The anomalous circulation over the PNA sector drives thermal advection that contributes to temperature anomalies over North America, as well as a Pacific decadal oscillation (PDO)-like sea surface temperature (SST) anomaly pattern in the midlatitude North Pacific. The PNA-like circulation anomaly tends to be supported by SST warming in the tropical central-eastern Pacific and a positive synoptic-scale eddy vorticity forcing feedback on the large-scale circulation over the PNA sector. The leading extreme mode-associated atmospheric circulation patterns obtained from the observational and reanalysis data, together with the anomalous SST and synoptic eddy activities, are reasonably well simulated in most CMIP5 models and in the multimodel mean. For most models considered, the simulated patterns of atmospheric circulation, SST, and synoptic eddy activities have lower spatial variances than the corresponding observational and reanalysis patterns over the PNA sector, especially over the North Pacific. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Climate models; Climatology; Digital storage; Oceanography; Orthogonal functions; Surface properties; Surface waters; Atmospheric circulation; Atmospheric circulation patterns; Empirical orthogonal function analysis; Interannual variability; Large-scale circulation; Pacific decadal oscillation; Sea surface temperature anomalies; Synoptic-eddy activity; Atmospheric temperature; air temperature; annual variation; anomaly; atmospheric circulation; CMIP; extreme event; surface temperature; winter; Canada
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171474
作者单位	Climate Research Division, Environment and Climate Change Canada, Toronto, ON, Canada; Meteorological Research Division, Environment and Climate Change Canada, Dorval, QC, Canada; Canadian Centre for Climate Modelling and Analysis, Environment and Climate Change Canada, Victoria, BC, Canada
推荐引用方式 GB/T 7714	Yu B.,Lin H.,Kharin V.V.,et al. Interannual variability of North American winter temperature extremes and its associated circulation anomalies in observations and CMIP5 simulations[J],2020,33(3).
APA	Yu B.,Lin H.,Kharin V.V.,&Wang X.L..(2020).Interannual variability of North American winter temperature extremes and its associated circulation anomalies in observations and CMIP5 simulations.Journal of Climate,33(3).
MLA	Yu B.,et al."Interannual variability of North American winter temperature extremes and its associated circulation anomalies in observations and CMIP5 simulations".Journal of Climate 33.3(2020).