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| Titel |
Validation of HF Radar ocean surface currents in the Ibiza Channel using lagrangian drifters, moored current meter and underwater gliders |
| VerfasserIn |
Arancha Lana, Vicente Fernández, Alejandro Orfila, Charles Troupin, Joaquin Tintoré |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103369
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| Publikation (Nr.) |
 EGU/EGU2015-2780.pdf |
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| Zusammenfassung |
| SOCIB High Frequency (HF) radar is one component of a multi-platform system located in
the Balearic Islands and made up of Lagrangian platforms (profilers and drifting
buoys), fixed stations (sea-level, weather, mooring and coastal), beach monitoring
(camera), gliders, a research vessel as well as an ocean forecast system (waves and
hydrodynamics).
The HF radar system overlooks the Ibiza Channel, known as a “choke point" where
Atlantic and Mediterranean water masses interact and where meridional exchanges of water
mass properties between the Balearic and the Algerian sub-basins take place. In order to
determine the reliability of surface velocity measurements in this area, a quality assessment
of the HF Radar is essential.
We present the results of several validation experiments performed in the Ibiza Channel in
2013 and 2014. Of particular interest is an experiment started in September 2014 when a set
of 13 surface drifters with different shapes and drogue lengths were released in the area
covered by the HF radar. The drifter trajectories can be examined following the SOCIB
Deployment Application (DAPP): http://apps.socib.es/dapp. Additionally, a
1-year long time series of surface currents obtained from a moored surface current-meter
located in the Ibiza Channel, inside the area covered by the HF radar, was also used as a
useful complementary validation exercise.
Direct comparison between both radial surface currents from each radar station
and total derived velocities against drifters and moored current meter velocities
provides an assessment of the HF radar data quality at different temporal periods and
geographical areas. Statistics from these comparisons give good correlation and low
root-mean-square deviation. The results will be discussed for different months,
geographical areas and types of surface drifters and wind exposure. Moreover,
autonomous underwater glider constitutes an additional source of information for the
validation of the observed velocity structures and some statistics will be presented. |
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