seanoe:98871 HABASQUE Jeremie Institut de Recherche pour le Développement, UMR LEMAR, IRD de Bretagne, BP70 29280 Plouzané, FRANCE 2026-06-10 ISO 19115:2003/19139 1.0 Acoustic data from Warmalis 3 cruise 2023-11 2026-06-10 Habasque Jeremie, Barbin Laure, Lebourges-Dhaussy Anne, Allain Valerie, Menkes Christophe (2023). Acoustic data from Warmalis 3 cruise. SEANOE. https://doi.org/10.17882/98871 This dataset contains acoustic data collected with scientific echosounders in the western and central Pacific in the equatorial area between French Polynesia and Papua New Guinea during a cruise performed onboard the French R/V ANTEA in 2023 in the framework of the program «MICROPAC». This work has received the financial support of the French ministry of the armed force.  We want to acknowledge R/V ANTEA crew that made the survey possible. This work has received the financial support of the French ministry of the armed force.  HABASQUE Jeremie Institut de Recherche pour le Développement, UMR LEMAR, IRD de Bretagne, BP70 29280 Plouzané, FRANCE BARBIN Laure Institut de Recherche pour le Développement, UMR ENTROPIE, IRD, Univ Réunion, CNRS, Nouméa, Nouvelle-Calédonie LEBOURGES-DHAUSSY Anne Institut de Recherche pour le Développement, UMR LEMAR, IRD de Bretagne, BP70 29280 Plouzané, FRANCE ALLAIN Valerie Pacific Community (SPC), 95 Promenade Roger Laroque BP D5 98848 Nouméa, Nouvelle-Caledonie MENKES Christophe Institut de Recherche pour le Développement, UMR ENTROPIE, IRD, Univ Réunion, CNRS, Nouméa, Nouvelle-Calédonie SEANOE https://www.seanoe.org/data/00877/98871/illustration.gif Sv echogram à 38 kHz échointégré sur 3pings * 1 mètre, 30 octobre 2023 ACOUSTICS MICRONEKTON PACIFIC OCEAN Biological oceanography Ocean Acoustics ODATIS aggregation parameters and Essential Variable names 2025-07-29 geonetwork.thesaurus.external.theme.NVS.OD1 Biological oceanography SeaDataNet Parameter Disciplines 2025-07-29 geonetwork.thesaurus.external.parameter.NVS.P08 /Observational data/in-situ Type de jeux de donnée ODATIS 2025-12-09 geonetwork.thesaurus.local.theme.type_jeux_donnee CC-BY-NC-SA (Creative Commons - Attribution, No commercial usage, Sharing under the same conditions) Acoustic data from Warmalis 1 cruise 2021 SEANOE Barbin Laure Habasque Jeremie Allain Valerie 10.17882/92059 10.17600/18001831 oceans -150.0 -210.0 -15.0 3.0 2023-09-25 2023-11-08 NC, NETCDF https://www.seanoe.org/data/00877/98871/data/109306.nc WWW:DOWNLOAD-1.0-link--download Quality controlled data WARMALIS 3 echointegrated data from 27/09/2023 to 08/11/2023 - 3 GB https://doi.org/10.17882/98871 DOI DOI of the product https://www.seanoe.org/data/00877/98871/ rel-canonical Seanoe Continuous acoustic measurements were made with calibrated echosounders (Foote et al., 1987) Simrad EK80 connected to hull-mounted (3m below the waterline) transducers operating at five frequencies: 18, 38, 70, 120 and 200 kHz. Data were acquired at a typical vessel speed of 8 knots with an average ping interval of 3 s. The pulse length was set at 1024 µs for all frequencies and transmit powers were of  1000, 2000, 600, 200, and 90 W for the four channels at 18, 38, 70, 120 and 200 kHz, respectively. The water column was sampled down to depths of 1500, 1200, 800, 250 and 120 m, respectively for those channels. Acoustic data were scrutinized, corrected and analysed using the “Movies3D” software developed at the “Institut Français de Recherche pour l'Exploitation de la Mer” (Ifremer; Trenkel et al., 2009) combined with the French “Institut de Recherche pour le Développement” (IRD) open source tool “Matecho” (Perrot et al., 2018), developed in MATLAB. The near-field noise was removed (3 m deep from the transducer, that is 6 m deep from the surface) from the analysis; phantom bottom echoes were excluded and the bottom line was corrected manually. Echograms were cleaned by eliminating unwanted signals such as one impulsive noise, transient noise due to the interferences with other electronic devices or other sources. Background noise was estimated and subtracted using methods described by De Robertis and Higginbottom (2007). Echograms were scrutinized and manually cleaned. The acoustic nautical area scattering coefficient (NASC), an indicator of marine organisms biomass, and the acoustic volume backscattering strength (Sv in dB re 1m-1), an indicator of marine organisms density, were calculated. Data were echo-integrated onto 1 m high layers over 0.1 nmi ESDU (elementary sampling distance unit) with a -100 dB threshold, from 8 m down to 800 m depth. The data provided are the results of the echointegration processing. Sensors metadata and variables are described in the report "ICES. 2016. A metadata convention for processed acoustic data from active acoustic systems. Series of ICES Survey Protocols SISP 4-TG-AcMeta. 48 pp".