Details of ABRACOS cruise - Physical datasets


Dataset identification

Title of datasetABRACOS cruise - Physical datasets
Narrative summary of datasetPhysical data associated with the ABRACO cruise. The ABRACOS (Acoustics along the BRAzilian COaSt) cruise aims to begin an integrated approach to monitoring the tropical marine ecosystems in the Brazilian Nordeste region in order to better understand the connectivity between the sub-systems composing it. In particular, this cruise should fill this gap and improve understanding of the degree of connectivity which exists between the oceanic islands and the continental margin in the Nordeste of Brazil, as well as within the continental platform. In this context, the main objective of the ABRACOS cruise consisted in drawing up a 3D characterization of abiotic and biotic compartments and their interactions in the Brazilian Nordeste. Specific objectives: Objective 1 - Characterization of island and coastal dynamics. Measurement of hydrological characteristics and currents (rosette, CTD, ADCP) should enable the circulation and characteristics of water masses to be described. These data will be more specifically used to study the physical connections between 1) the oceanic islands and coastal ecosystems and 2) the coast along the ocean and coastal zones. The in-situ measurements obtained will also be used to validate high resolution regional hydrodynamic models (e.g. ROMS model) which will be implemented. In-situ data acquired during the ABRACOS cruise will be supplemented by satellite data for sea surface heights (e.g. AVISO), surface temperature and chlorophyll (e.g. MODIS) and wind (e.g. ASCAT). However, it should be noted that the resolution of the products usually used and land-ocean interferences on altimetry and backscatter data will not allow these products to be used at less than 30-50 km from the coast. We will be able to partially eliminate this problem by using new "alongtrack" processing of altimetric data performed by the Center for Topographic studies of the Ocean and Hydrosphere in Toulouse. These data will be used to document the geostrophic (from sea level) ageostrophic (from wind) components of surface circulation and their variability in coastal zones. Objective 2 - Ecosystem acoustics. Acoustic tools can provide the simultaneous acquisition of quantitative and qualitative data, at different spatial-temporal scales, in numerous biotic and abiotic compartments of an ecosystem. These data can be used to characterize the ecosystem in three dimensions and directly study interactions between compartments. Active acoustics have rarely been used in tropical coastal zones. The multifrequency (38, 70, 120, and 200 kHz) acoustic data acquired during the ABRACOS cruise will be used to create an initial 3D characterization of island and coastal ecosystems in the Brazilian Nordeste region, simultaneously characterizing the seabed and water column, when possible. The French team proposing this has sound experience in the field and developed the open source 'Echopen' software in Brest ( which can separate the various sources of acoustic echoes (e.g. zooplankton, gelatinous organisms and fish) from multifrequency acoustic data. In order to calibrate the 'Echopen Brésil' version, acoustic observations from the ABRACOS cruise must be combined with sampling using micronekton, mesopelagic and bottom trawls (Leg 2 only) and sampling of zooplankton at fixed stations (bongo and WP2 plankton nets and phytoplankton nets). To validate the 'Echopen substrat' tool we will use sampling done with bottom trawl, substrate grab and video camera observations. Objective 3 - Biodiversity and trophic structure. As indicated, acoustic observations will be complemented by in-situ sampling of planktonic, pelagic (mid-water trawls) and demersal-benthic (bottom trawl) organisms. This will involve establishing how hydrological conditions determine the vertical distribution of organisms and therefore interactions. One part of the sampled organisms will be conserved in formaldehyde then identified by taxonomists at the Federal university of Rio de Janeiro (UFRJ) to be added to Brazilian collections. The remainder of the samples will be used to obtain biological information. Along with the classic biological measurements (size, weight, sex, maturity, etc.) specimens of entire organisms (plankton) and soft tissues (muscles) will be taken in order to titrate various trophic tracers: stable isotopes of carbon, nitrogen and insofar as possible mercury. In addition, particulate organic matter (POM) will be collected by filtration (samples taken by rosette) to titrate the amounts of stable isotopes. Spatial variations in these tracers will make it possible to highlight the relative positions of these organisms in the food web and variations in food sources through the local POM signatures. Measurements of methylmercury (MeHg), a neurotoxin which accumulates in the food chain, will also be performed on part of the samples used for stable isotopes. The related projects are ABRACOS and Action Incitative IRD "DANOB". Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.
  • 486_15005600
  • Start date2015-09-29
    End date2015-10-21

    Responsible organisations

    Organisation nameIfremer, Scientific Information Systems for the sea
    Role of organisationDataset Holding Organisation
    Organisation nameSEA scieNtific Open data Edition
    Role of organisationPublisher
    How to citeBertrand Arnaud, Costa Da Silva Alex, Chaigneau Alexis, Eldin Gérard, Roubaut Fabrice, Grelet Jacques, Ternon Jean-Francois, Roudaut Gildas, Lebourges-Dhaussy Anne, Rousselot Pierre (2015). ABRACOS cruise - Physical datasets. SEANOE.

    Dataset availability


    Latitude north boundary-3
    Longitude east boundary-31
    Latitude south boundary-9
    Longitude west boundary-36
    Sea areaSouth Atlantic Ocean
    Atlantic Ocean
    Southwest Atlantic Ocean (20W)

    Data types, collection and processing

    Observation typePigments
    Dissolved gases
    Water column temperature and salinity
    ParameterVariable fluorescence parameters
    Dissolved oxygen parameters in the water column
    Salinity of the water column
    Horizontal velocity of the water column (currents)
    Temperature of the water column
    Instrument typecurrent profilers
    Instrument nameTeledyne RDI 75kHz Ocean Observer narrowband ADCP
    Instrument typeCTD
    Instrument nameSea-Bird SBE 911plus CTD
    Instrument typethermosalinographs
    Instrument nameSea-Bird SBE 21 Thermosalinograph
    Platform typeresearch vessel
    Platform nameAntea
    Data quality processing informationQuality controlled data,Processed data

    Process information

    Submitting organisationIRD, Centre de Bretagne
    Submission identifier (UUID)a53ad03f-3736-7363-3636-000000076696
    Date of dataset creation2015-01-01
    Date of dataset revision2021-02-26
    Date of metadata creation2021-2-27
    Date of metadata latest revision2021-03-17
    Date of publishing2021-04-06
    Date of processed dataset publication2022-09-05
    Processing data centreIfremer, Scientific Information Systems for the sea
    Summary record-ID778