Date (Creation)

2015-01-01

Date (Revision)

2021-02-26

Date (Publication)

2021-04-06

Date (Publication)

2022-09-05

Citation identifier

a53ad03f-3736-7363-3636-000000076696

Code

DOI:10.17882/76696

Other citation details

Bertrand 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. https://doi.org/10.17882/76696

Point of contact

Organisation name	Individual name	Electronic mail address	Role
SEA scieNtific Open data Edition		data@seanoe.org	Publisher
Ifremer, Scientific Information Systems for the sea		sismer@ifremer.fr	Dataset Holding Organisation
Ifremer, Scientific Information Systems for the sea		sismer@ifremer.fr	Author

GEMET - INSPIRE themes, version 1.0

• Oceanographic geographical features

SeaVoX salt and fresh water body gazetteer

• South Atlantic Ocean
• Atlantic Ocean
• Southwest Atlantic Ocean (20W)

SeaDataNet Agreed Parameter Groups

• Pigments
• Dissolved gases
• Water column temperature and salinity
• Currents

SeaDataNet device categories

• current profilers
• CTD
• thermosalinographs

SeaVoX Device Catalogue

• Sea-Bird SBE 911plus CTD
• Teledyne RDI Ocean Observer 75 kHz narrowband ADCP
• Sea-Bird SBE 21 Thermosalinograph

SeaDataNet Parameter Discovery Vocabulary

• Variable 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

CRUISE SUMMARY REPORT INVENTORY (CSR)

• 486_15005600

SeaVoX Platform Categories

• research vessel

MEDIN data format categories

• Network Common Data Form
• Ocean Data View

Keywords

Access constraints

Other restrictions

Other constraints

no limitations to public access

Use limitation

Conditions for access and use apply

Use constraints

Other restrictions

Other constraints

CC-BY 4.0

Character set

UTF8

Topic category

• Oceans

Begin date

2015-09-29

End date

2015-10-21

Unique resource identifier

WGS 1984

Distribution format

Name	Version
Network Common Data Form	1
Ocean Data View	1

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-http--download	https://cloud.emodnet-ingestion.eu/index.php/s/flDpXfJU6Azzj9z
WWW:LINK-1.0-http--link	https://cdi.seadatanet.org/search/welcome.php?query=2373&query_code={042845C5-FBE3-46E1-A93A-40AE8EC1A5B2}
WWW:LINK-1.0-http--link	https://cdi-chemistry.seadatanet.org/search/welcome.php?query=2373&query_code={042845C5-FBE3-46E1-A93A-40AE8EC1A5B2}

Hierarchy level

Dataset

Statement

Quality controlled data,Processed data|Physical 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 (www.france-nord.ird.fr/lesressources/outils-informatiques) 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".

Metadata

File identifier

a53ad03f-3736-7363-3636-000000076696 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2025-05-07T00:00:00

Metadata standard name

ISO 19115:2003/19139

Metadata standard version

1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
IRD, Centre de Bretagne			Point of contact