Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability

Type Article
Date 2020-11
Language English
Author(s) Hochet Antoine1, Huck Thierry3, Arzel Olivier1, Sevellec Florian3, Colin De Verdiere Alain1, Mazloff Matthew2, Cornuelle Bruce2
Affiliation(s) 1 : Univ Brest, CNRS, Ifremer, IRD, Laboratoire d’Oc´eanographie Physique et Spatiale (LOPS, UMR 6523), IUEM, Brest, France
2 : Scripps institution of Oceanography, La Jolla, California, USA.
3 : Univ Brest, CNRS, Ifremer, IRD, Laboratoire d’Oc´eanographie Physique et Spatiale (LOPS, UMR 6523), IUEM, Brest, France
Source Journal Of Climate (0894-8755) (American Meteorological Society), 2020-11 , Vol. 33 , N. 21 , P. 9409-9425
DOI 10.1175/JCLI-D-19-0921.1
WOS© Times Cited 2
Abstract

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 meso-scale eddies. How high-frequency motions associated with the meso-scale eddy field affect the basin-scale low-frequency variabiliy 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 meso-scale eddies is to damp low frequency temperature variance and to transfer it to high frequencies.

Full Text
File Pages Size Access
Publisher's official version 50 3 MB Open access
Top of the page

How to cite 

Hochet Antoine, Huck Thierry, Arzel Olivier, Sevellec Florian, Colin De Verdiere Alain, Mazloff Matthew, Cornuelle Bruce (2020). Direct temporal cascade of temperature variance in eddy-permitting simulations of multidecadal variability. Journal Of Climate, 33(21), 9409-9425. Publisher's official version : https://doi.org/10.1175/JCLI-D-19-0921.1 , Open Access version : https://archimer.ifremer.fr/doc/00635/74701/