English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/123243
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Use of SARAL/Altika data in a multi-sensor approach: Application to the study of a coastal current in the Balearic Sea

AuthorsTroupin, Charles; Pascual, Ananda ; Valladeau, Guillaume; Lana, Arantxa ; Heslop, Emma ; Ruiz, Simón ; Torner, Marc; Picot, Nicolas; Tintoré, Joaquín
Issue Date16-Jun-2014
Citation6th EGO Meeting and Final Symposium of the COST Action ES0904 (2014)
AbstractThis paper presents the results of the G-AltiKa mission conducted along a SARAL-AltiKa track south-west of Ibiza (Balearic Islands, Western Mediterranean Sea) from 1 to 5 August 2013. The main feature of the mission is that the glider measurements are almost synchronous with the altimeter pass. The HF radar system operated by the Balearic Islands Coastal Observing and Forecasting System (SOCIB) constitutes a complementary tool to describe the circulation in the study area. The work is focused on the data processing step (interpolation, filtering, corrections) applied to the measurements and on the comparison of the geostrophic velocity across the satellite track. The absolute dynamic topography, computed by adding filtered 1 Hz and 40 Hz along-track sea-level anomalies Mediterranean Sea Mean Dynamic Topography, and the dynamic height, computed from glider temperature and salinity, both exhibited a signal characterized by weak gradients and amplitudes (2 cm), close to the expected accuracy of the AltiKa instrument. The corresponding geostrophic velocities and the HF radar velocities projected on the SARAL/AltiKa track all depicted a northwestward coastal current with a maximal velocity larger than 20 cm/s. The lack of synopticity due to the time interval between the satellite pass (August 1, 2013, 18:26:12 UTC) and the end of the glider transect (August 5, 2013, 04:17:22 UTC) resulted in a spatial shift between the glider and the altimeter along-track signal, around 5 km. The time evolution of the HF radar currents during the mission duration confirmed the plausibility of such a shift. After the application of a 5 km lag to the glider dynamic height, the correlation and RMS difference between the different platforms were computed. The agreement between the altimetry, glider and HF radar cross-track velocities was synthesized in a Taylor diagram that evidenced the lowest root mean square difference (9.72 cm/s) and the highest correlation (0.64) between the velocities obtained from the glider dynamic height and those from the filtered 40 Hz sea-level anomalies. The 40 Hz data are particularly valuable as they enable us to use the SARAL-AltiKa data closer to the coast than typically possible with altimetry
DescriptionTrabajo presentado en el 6th EGO Meeting and Final Symposium of the COST Action ES0904, celebrado los días 16 y 17 de junio de 2014 en Kiel (Alemania)
URIhttp://hdl.handle.net/10261/123243
Appears in Collections:(IMEDEA) Comunicaciones congresos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.