气候变化领域集成服务门户(CCPortal): Mechanisms of decadal North Atlantic climate variability and implications for the recent cold anomaly

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DOI	10.1175/JCLI-D-20-0464.1
	Mechanisms of decadal North Atlantic climate variability and implications for the recent cold anomaly
	Årthun M.; Wills R.C.J.; Johnson H.L.; Chafik L.; Langehaug H.R.
发表日期	2021
ISSN	08948755
起始页码	3421
结束页码	3439
卷号	34 期号:9
英文摘要	Decadal sea surface temperature (SST) fluctuations in the North Atlantic Ocean influence climate over adjacent land areas and are a major source of skill in climate predictions. However, the mechanisms underlying decadal SST variability remain to be fully understood. This study isolates the mechanisms driving North Atlantic SST variability on decadal time scales using low-frequency component analysis, which identifies the spatial and temporal structure of low-frequency variability. Based on observations, large ensemble historical simulations, and preindustrial control simulations, we identify a decadal mode of atmosphere-ocean variability in the North Atlantic with a dominant time scale of 13-18 years. Large-scale atmospheric circulation anomalies drive SST anomalies both through contemporaneous air-sea heat fluxes and through delayed ocean circulation changes, the latter involving both the meridional overturning circulation and the horizontal gyre circulation. The decadal SST anomalies alter the atmospheric meridional temperature gradient, leading to a reversal of the initial atmospheric circulation anomaly. The time scale of variability is consistent with westward propagation of baroclinic Rossby waves across the subtropical North Atlantic. The temporal development and spatial pattern of observed decadal SST variability are consistent with the recent observed cooling in the subpolar North Atlantic. This suggests that the recent cold anomaly in the subpolar North Atlantic is, in part, a result of decadal SST variability. © 2021 American Meteorological Society
英文关键词	Atmosphere-ocean interaction; Decadal variability; Gyres; Meridional overturning circulation; North Atlantic Ocean; Sea surface temperature
语种	英语
scopus关键词	Climatology; Heat flux; Mechanical waves; Surface waters; Time measurement; Atmosphere ocean variability; Atmospheric circulation anomaly; Low frequency variability; Low-frequency components; Meridional overturning circulations; Meridional temperature gradient; Sea surface temperature (SST); Subpolar North Atlantic; Oceanography
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/178604
作者单位	Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Nansen Environmental and Remote Sensing Center, Bergen, Norway
推荐引用方式 GB/T 7714	Årthun M.,Wills R.C.J.,Johnson H.L.,et al. Mechanisms of decadal North Atlantic climate variability and implications for the recent cold anomaly[J],2021,34(9).
APA	Årthun M.,Wills R.C.J.,Johnson H.L.,Chafik L.,&Langehaug H.R..(2021).Mechanisms of decadal North Atlantic climate variability and implications for the recent cold anomaly.Journal of Climate,34(9).
MLA	Årthun M.,et al."Mechanisms of decadal North Atlantic climate variability and implications for the recent cold anomaly".Journal of Climate 34.9(2021).