Brazilian PIRATA cruises: S-ADCP data
|Temporal extent||2001 -2018|
|Author(s)||Araujo Moacyr1, Dimoune Djoirka Minto1, Trotte-Duhá Janice2, Nobre Paulo3, Rodrigues Regina4, Cotrim Letícia5, Buss Ronald3, Ferreira Antônio Geraldo6, Arlino Paulo3|
|Affiliation(s)||1 : UFPE, Department of Oceanography, Pernambuco, Brazil
2 : Marinha do Brasil, Directorate of Hydrography and Navigation, Rio de Janeiro, Brazil
3 : INPE, Center for Weather Prediction and Climate Studies, São Paulo, Brazil
4 : UFSC, Department of Oceanography, Santa Catarina, Brazil
5 : UERJ, Faculty of Oceanography, Rio de Janeiro, Brazil
6 : UFC, Marine Science Institute, Ceará, Brazil
|Keyword(s)||upper ocean currents, tropical Atlantic, western boundary currents|
In order to understand the tropical Atlantic ocean dynamics and its role on the climate, the Prediction and Research Moored Array in the Tropical Atlantic (PIRATA) oceanographic program undertakes each year the maintenance of its buoys dispatched in the whole tropical basin (Bourlès et al., 2008; 2019). Brazil is in charge of the maintenance of the buoys at the western boundary and has started cruises to maintain the buoys and collect data since 1998. From 2001, the research vessels used for the purpose were equipped by the Ship-mounted Acoustic Doppler Current Profilers (S-ADCP), which measure the zonal and meridional components of the currents along the ship route. The raw data (2 min Short Term Averaged files - STA, and Long Term Averaged files - LTA) from these acoustic profilers have been processed here with CASCADE (Chaîne Automatisée de Suivi des Courantomètres Acoustiques Doppler Embarqués) software (Kermabon et al., 2018) and made available.
For the 9 cruises PIRATA-BR IV to XII, the data were obtained from only a BroadBand (BB) 75kHz system whereas for the other cruises, the data were obtained from Ocean Surveyor 75 kHz system with BB mode (PIRATA-BR XIII, XV and XVII) or mixed BroadBand-NarrowBand modes (PIRATA-BR XVI and XVIII). Almost all the cruises were carried out onboard the R/V Antares (12 of them), except for PIRATA-BR XVII and XVIII, which were onboard the R/V Vital de Oliveira. The processing has been made on *.STA files for the cruises from 2001 to 2017 and on the *.LTA for the 2018 cruise. The acoustic downward ping was processed in 8-m length bin vertical resolution and the reference layer for good data have been taken between third and eighth bins. The absolute current velocity along the vertical profiles were computed with CASCADE, using the standard shipboard gyroscopic compass heading and navigation from the Global Positioning System. More details about the processing can be found in Le Bot et al. (2011).