French PIRATA cruises: S-ADCP data
|Temporal extent||2011 -2020|
|Author(s)||Bourlès Bernard1, Herbert Gaëlle2, Rousselot Pierre1, Grelet Jacques1|
|Affiliation(s)||1 : IRD, Unité de service Instrumentation, Moyens, Analytiques, Observatoires en Géophysique et Océanographie (IMAGO), Brest, France
2 : IRD, Laboratoire d'Etudes en Géophysique et Océanographie Spatiales (LEGOS), Brest, France
Measurements of the two horizontal components of the currents were collected with the Ship-mounted Acoustic Doppler Current Profilers (S-ADCP) in the Gulf of Guinea during cruises carried out from 2007 to 2016 in the framework of the programs «Prediction and Research morred Array in the Tropical Atlantic» (PIRATA ; Bourlès et al., 2008) and « Etude de la circulation océanique et des échanges océan-atmosphère dans le Golfe de Guinée » (EGEE ; Bourlès et al., 2007), the French oceanographic component of the «African Monsoon Multidisciplinary Analysis» program (AMMA ; Redelsperger et al., 2006). The data have been processed with the CASCADE (Chaîne Automatisée de Suivi des Courantomètres Acoustiques Doppler Embarqués) software (Kermabon and Gaillard, 2011). This dataset is also be used in the framework of the EU PREFACE program (see http://preface.b.uib.no/).
For the 4 cruises PIRATA-FR16-17-18-20, onboard the R/V L'Antea, the data are obtained from an Ocean Surveyor 75kHz system while it was a broad-band 150kHz system for the 4 following cruises (PIRATA-FR21-22-23-24) onboard the R/V Le Suroit. For the 2 last cruises PIRATA-FR25-26, Ocean Surveyor 38 kHZ and 150 kHZ systems are used. For the 8 first cruises, the vertical profiling resolution was nominally 8m (=bin size) for the 150 and 75 kHz ADCP's while it was 16m and 4m for respectively the 38 kHz and the 150 kHz ADCPs during PIRATA-FR25-26 cruises. The SADCP measurements extend until about 200m for the 150kHz , 650m for the 75 kHz and 850m for the 38kHz. Absolute referencing was provided by Global Positioning System (GPS) navigation. For additional background and references on the oceanographic application of shipboard ADCPs, see e.g. Firing and Hummon (2010). The SADCP data were processed using CASCADE software (Kermabon and Gaillard, 2001; Le Bot et al., 2011). The processing has been made only on *.STA files (for "Short Term Average" with 2 minutes averages). For details on the data processing methodology, see Herbert et al., (2015).