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contributor authorMünnich, Matthias
contributor authorLatif, Mojib
contributor authorVenzke, Stephan
contributor authorMaier-Reimer, Ernst
date accessioned2017-06-09T15:42:08Z
date available2017-06-09T15:42:08Z
date copyright1998/12/01
date issued1998
identifier issn0894-8755
identifier otherams-5111.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4190746
description abstractTo study the dynamics that may lead to decadal oscillations in the North Pacific a simple coupled model is developed. The ocean is based on the linear, potential vorticity equation for baroclinic planetary waves. The atmosphere is reduced to a nonlocal wind response to thermocline depth anomalies. The wind stress has a spatially fixed structure and its amplitude depends on the thermocline perturbation at one location or in a predefined index region. Such a simple coupled model produces decadal oscillations for suitable parameter choices. For realistic wind stress patterns, the patterns of oceanic variability are similar to those observed. It is determined by the speed of long Rossby waves at the coupling latitude. The period of the oscillation is rather insensitive to the coupling strength and amounts to approximately twice the time the Rossby wave needs to travel from the center of the wind stress curl anomaly to the coupling location. A stochastic component to the atmospheric forcing is incorporated by white noise added to the feedback. With such a forcing, typical oceanic spectra become red with a broad peak at decadal timescales superimposed.
publisherAmerican Meteorological Society
titleDecadal Oscillations in a Simple Coupled Model
typeJournal Paper
journal volume11
journal issue12
journal titleJournal of Climate
identifier doi10.1175/1520-0442(1998)011<3309:DOIASC>2.0.CO;2
journal fristpage3309
journal lastpage3319
treeJournal of Climate:;1998:;volume( 011 ):;issue: 012
contenttypeFulltext


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