Citation:

PANGAEA.975986

Name: Acoustic data during RV SONNE cruise SO287
Published: 2025-03-03
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Echointegration; micronekton; Sound scattering layer

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Published: 2025-03-03 • DOI registered: 2025-04-01

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Abstract:

Acoustic data were recorded from December 12, 2021, to January 11, 2022, using a Simrad EK60 hull-mounted echosounder operating at four frequencies ( 18, 38 , 120, and 200 kHz) along the cruise track. The system operated continuously (24/7) with a 20 log R time-varied gain function, a pulse length of 1.024 ms, and a maximum transmission power of 2000 W. Data processing was conducted using the in-house software Matecho (Perrot et al., 2018) for echogram corrections, noise reduction, and extraction of fish schools and scattering layers (SSLs). Sound speed corrections were applied using temperature and salinity data from CTD measurements (Coly et al., 2022). The corrected data were echo-integrated at 0.1 nautical mile (nmi) intervals, and the Nautical Area Scattering Coefficient (NASC, m² nmi⁻²) was used to assess spatial variability as a proxy for marine biomass. SSLs with mean volume backscattering strength (Sv) below -70 dB (relative micronektonic biomass) were extracted, and their descriptors were computed.

Keyword(s):

Echointegration; micronekton; Sound scattering layer

Coverage:

Median Latitude: 12.930726 * Median Longitude: -47.663430 * South-bound Latitude: -2.278935 * West-bound Longitude: -79.911778 * North-bound Latitude: 28.140387 * East-bound Longitude: -15.415083

Date/Time Start: 2021-12-11T08:00:01 * Date/Time End: 2022-01-11T07:59:58

Event(s):

SO287-track * Latitude Start: 28.140387 * Longitude Start: -15.415083 * Latitude End: -2.278935 * Longitude End: -79.911778 * Date/Time Start: 2021-12-11T08:00:01 * Date/Time End: 2022-01-11T07:59:58 * Campaign: (CONNECT) * Basis: * Method/Device: Underway cruise track measurements (CT) * Comment: Las Palmas - Guayaquil

Comment:

Matecho is an open source and integrative processing software that allows the correction of echograms, i.e., bottom depths, removing empty pings and echogram interference, and reducing background noise. It offers several other functionalities, including automatic data correction and filtering, echo-integration and extraction of fish schools and SSL.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device
1	Binary Object	Binary		Diogoul, Ndague	Echo Sounder
2	Binary Object (File Size)	Binary (Size)	Bytes	Diogoul, Ndague	Echo Sounder
3	Binary Object (Media Type)	Binary (Type)		Diogoul, Ndague	Echo Sounder

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Basic curation (CurationLevelB)

Size:

2 data points

Data

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1 Binary	2 Binary (Size) [Bytes]	3 Binary (Type)
Echointegration.mat	1.4 GBytes	application/x-matlab-data
SSL_Descriptors.txt	96.8 MBytes	text/plain