The role of nonlinear self-interaction in the dynamics of planetary-scale atmospheric fluctuations
dc.contributor.author
Saffioti, Claudio
dc.contributor.author
Malguzzi, Piero
dc.contributor.author
Speranza, Antonio
dc.date.accessioned
2023-06-26T13:15:17Z
dc.date.available
2017-06-12T12:06:41Z
dc.date.available
2023-06-26T13:15:17Z
dc.date.issued
2016-09-09
dc.identifier.issn
1751-8113
dc.identifier.issn
1361-6447
dc.identifier.other
10.1088/1751-8113/49/36/364003
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/120175
dc.identifier.doi
10.3929/ethz-b-000120175
dc.description.abstract
A central role in the general circulation of the atmosphere is played by planetary-scale inertial fluctuations with zonal wavenumber in the range k = 1–4. Geopotential variance in this range is markedly non-gaussian and a great fraction of it is non-propagating, in contrast with the normal distribution of amplitudes and the basically propagating character of fluctuations in the baroclinic range (3 < k < 15). While a wave dispersion relationship can be identified in the baroclinic range, no clear relationship between time and space scales emerges in the ultra-long regime (k < 5, period >10 days). We investigate the hypothesis that nonlinear self-interaction of planetary waves influences the mobility (and, therefore, the dispersion) of ultra-long planetary fluctuations. By means of a perturbation expansion of the barotropic vorticity equation we derive a minimal analytic description of the impact of self-nonlinearity on mobility and we show that this is responsible for a correction term to phase speed, with the prevalent effect of slowing down the propagation of waves. The intensity of nonlinear self-interaction is shown to increase with the complexity of the flow, depending on both its zonal and meridional modulations. Reanalysis data of geopotential height and zonal wind are analysed in order to test the effect of self-nonlinearity on observed planetary flows.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
IOP Publishing
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.subject
Barotropic vorticity equation
en_US
dc.subject
Multiple-scale analysis
en_US
dc.subject
Nonlinear processes
en_US
dc.subject
Potential vorticity
en_US
dc.subject
Rossby waves
en_US
dc.subject
Stationary waves
en_US
dc.title
The role of nonlinear self-interaction in the dynamics of planetary-scale atmospheric fluctuations
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2016-08-17
ethz.journal.title
Journal of Physics A: Mathematical and Theoretical
ethz.journal.volume
49
en_US
ethz.journal.issue
36
en_US
ethz.journal.abbreviated
J. Phys. A: Math. Theor.
ethz.pages.start
364003
en_US
ethz.size
12 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
000038639
ethz.publication.place
Bristol
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03777 - Knutti, Reto / Knutti, Reto
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03777 - Knutti, Reto / Knutti, Reto
ethz.date.deposited
2017-06-12T12:07:02Z
ethz.source
ECIT
ethz.identifier.importid
imp593654afad7b346923
ethz.ecitpid
pub:182228
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T09:02:25Z
ethz.rosetta.lastUpdated
2024-02-03T00:25:19Z
ethz.rosetta.versionExported
true
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