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| Titel |
Observations of the interaction between near-inertial waves and mesoscale eddies |
| VerfasserIn |
Antonio Martínez-Marrero, Pablo Sangrà, Rui Caldeira, Borja Aguiar-González, Angel Rodriguez-Santana |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093456
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| Publikation (Nr.) |
 EGU/EGU2014-8182.pdf |
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| Zusammenfassung |
| Trajectories of eight drifters dragged below the surface mixed layer and current meter data
from a mooring are used to analyse the interaction between near-inertial waves and mesoscale
eddies. Drifters were deployed within eddies generated downstream of Canary and Madeira
islands between 1998 and 2007. The mooring was installed in the passage of cyclonic eddies
induced by Gran Canaria island during 2006. Rotatory wavelet analysis of Lagrangian
velocities shows a clear relationship between the near-inertial waves’ intrinsic frequencies
and the eddy angular velocities. The results reveal that near-inertial waves reach a
minimum frequency of half the planetary vorticity (f/2) in the inner core of young
anticyclonic eddies rotating with its maximum absolute angular speed of f/2. The highest
amplitudes of the observed inertial motions are also found within anticyclonic eddies
evidencing the trapping of inertial waves. Finally, the analysis of the current meter series
show frequency fluctuations of the near-inertial currents in the upper 500 meters
that are related to the passage of cyclonic eddies. These fluctuations appear to be
consistent with the variation of the background vorticity produced by the eddies. |
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