气候变化领域集成服务门户(CCPortal): Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability

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DOI	10.1175/JCLI-D-19-0921.1
	Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability
	Hochet A.; Huck T.; Arzel O.; Sévellec F.; Colin De Verdière A.; Mazloff M.; Cornuelle B.
发表日期	2020
ISSN	0894-8755
起始页码	9409
结束页码	9425
卷号	33 期号:21
英文摘要	The North Atlantic is characterized by basin-scale multidecadal fluctuations of the sea surface temperature with periods ranging from 20 to 70 years. One candidate for such a variability is a large-scale baroclinic instability of the temperature gradients across the Atlantic associated with the North Atlantic Current. Because of the long time scales involved, most of the studies devoted to this problem are based on low-resolution numerical models leaving aside the effect of explicit mesoscale eddies. How high-frequency motions associated with the mesoscale eddy field affect the basin-scale low-frequency variability is the central question of this study. This issue is addressed using an idealized configuration of an ocean general circulation model at eddy-permitting resolution (20 km). A new diagnostic allowing the calculation of nonlinear fluxes of temperature variance in frequency space is presented. Using this diagnostic, we show that the primary effect of mesoscale eddies is to damp low-frequency temperature variance and to transfer it to high frequencies. © 2020 American Meteorological Society.
英文关键词	Eddy currents; Surface waters; Baroclinic instability; Eddy-permitting resolution; Low frequency variability; Multidecadal fluctuations; Multidecadal variability; North Atlantic Currents; Ocean general circulation models; Sea surface temperature (SST); Oceanography; baroclinic instability; computer simulation; decadal variation; mesoscale eddy; numerical model; oceanic general circulation model; sea surface temperature; synoptic meteorology; temperature gradient; temperature profile; Atlantic Ocean; Atlantic Ocean (North)
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/171069
作者单位	University of Brest, CNRS, Ifremer, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS, UMR 6523), IUEM, Brest, France; Scripps Institution of Oceanography, San Diego, CA, United States
推荐引用方式 GB/T 7714	Hochet A.,Huck T.,Arzel O.,et al. Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability[J],2020,33(21).
APA	Hochet A..,Huck T..,Arzel O..,Sévellec F..,Colin De Verdière A..,...&Cornuelle B..(2020).Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability.Journal of Climate,33(21).
MLA	Hochet A.,et al."Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability".Journal of Climate 33.21(2020).