Dataset: Echosounder data (38kHz)

Name: Echosounder data (38kHz) collected along the slope between Faial and Pico Island Azores in November and December of 2021
Published: 2024-03-12
Keywords: echosounder, scattering layer, migration, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.921981.1

Spatial Extent: N:38.3003 E:-28.3522 S:38.3003 W:-28.3522

Field echosounding took place near Faial and Pico Islands, Azores archipelago (38.3003° N, 28.3522°W)

Temporal Extent: 2021-11-29 - 2021-12-02

Project:

RAPID: Too hot to hold: Effects of unseasonable warming on the Azores nekton community and its keystone taxon (Too hot to hold)

Principal Investigator:

T. Aran Mooney (Woods Hole Oceanographic Institution, WHOI)

Student:

Seth Cones (Woods Hole Oceanographic Institution, WHOI)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2024-03-12

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Echosounder data (38kHz) collected along the slope between Faial and Pico Island Azores in November and December of 2021

Abstract:

We collected 38 kHz scientific grade echosounding along the slope between Faial and Pico Island Azores. These data span night and day time periods and were aimed at measuring the diel vertical migration of the deep scattering layer in the area. The transducer was mounted near the transom of a boat and was submerged 0.5 meters below the surface.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2024-03-12	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.921981.1	2024-03-13

Methods & Sampling

Deployments: Day-trips aboard a 21-foot RIB while winds were less than 15 knots. Data span November 29 to December 2nd.

Sampling was completed with a BioSonics DTX Extreme scientific echosounder and a 38kHz transducer. Transducer was coated in soap prior to deployment to prevent bubbles on surface. Sampling took place along depth range spanning 100-500 meters while the boat transited at 1.5 knots above bottom.

Data Processing Description

The echosounding data (.dt4) were not edited. The data from the instrument in .dt4 format was viewed on Visual Aquatic v1.0.0.13146 and exported as csv format. The tabular csv form of the dataset was used for the primary format of this BCO-DMO dataset (see Data Files section). Additional columns were added by BCO-DMO for lat,lon, and datetime (see BCO-DMO Processing Notes section).

The .dt4 files are provided in the Supplemental Files section. The .dt4 files can be loaded in Visual Aquatic, provided through Biosonics Inc, and it includes post-processing capabilities.

BCO-DMO Processing

* Submitted file "Rapid_Azores_Echosounding.csv" was imported into the BCO-DMO data system for this dataset.
* Lat lon columns added from values provided in metadata.
* ISO_DateTime_UTC column added (ISO 8601 format) from local timestamp provided in Azores time GMT-1

Data Files

File
921981_v1_echosounder-38khz.csv (Comma Separated Values (.csv), 166.32 KB) MD5:1828e3a22fb6d9b0235b1e83c2c84a07 Primary data file for dataset ID 921981, version 1. This data is also provided in an alternate format (see Supplemental file " Echosounder data (38kHz) in .dt4 format").

Supplemental Files

File

Echosounder data (38kHz) in .dt4 format
filename: echosounder38kHz_dt4-format.zip

(ZIP Archive (ZIP), 223.13 MB)
MD5:d227f4fbcd071b4bb1fdab3281c773f2

Data in format (dt4) are specific to the instrument manufacturer and can be viewed using Visual Acquatic software from  BioSonics.  This is an alternate form of the dataset from the main data table provided as "921981_v1_echosounder-38khz.csv" (see "Data Files" section) which requires no proprietary software to view or use.  

This zip file contains the following files:
'day1N_20211129_154458.dt4'
'day1N_20211129_161458.dt4'
'day1N_20211129_164458.dt4'
'day 2S20211202_163454.dt4'
'day 2S20211202_170454.dt4'
'day 2S20211202_171857.dt4'

Echosounder 38kHz configuration
filename: ADP Biosonics Configuration for NAAMES - 38kHz.pdf

(Portable Document Format (.pdf), 434.08 KB)
MD5:690ba0a1c4cbb3ceffca25cdb2b0ea68

Configuration screenshots for echosounder (38kHz) as shown in Visual  Acquisition software (Biosonics, Inc.).

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-2203204

Deployments

None available yet

Instruments

BioSonics DT-X Digital Scientific Echosounder

Supplied Name:

Supplied Description:

BioSonics DTX Extreme scientific echosounder and a 38kHz transducer

Instrument Type

Generic Name: BioSonics DT-X Digital Scientific Echosounder

Acronym: BioSonics DT-X Echosounder

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/FFES/

Generic Description:

The BioSonics DT-X Digital Scientific Echosounder is available in single or spilt beam configuration. The resultant data set comprises 38 and 120 kHz split beam data. The DT-X Digital Scientific Echosounder is used for stock assessment, biomass estimates, and habitat mapping. DT-X digital transducers are available in a range of frequencies (38, 70, 120, 200, and 420 kHz) and beam patterns in split beam or single beam. Up to 5 transducers can be mulltiplexed for simultaneous data collection in any combination of frequencies and transducer orientations. The BioSonics split beam echosounder data can be analyzed for fish quantity, individual sizes, direction of travel through the acoustic beam. Data analysis is done using BioSonics, Echoview, or Sonar4/5-Pro software (and other options are available). Additional information is available from: BioSonics DT-X Digital Echosounder (http://www.biosonicsinc.com/product-overview.asp), BioSonics (http://www.biosonicsinc.com), Echoview (http://www.echoview.com/), and Sonar4/5-Pro (http://tid.uio.no/~hbalk/sonar4_5/index.htm).

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Time	Date and time. Local Time zone = GMT-01:00	unitless	DateTime
FileName	Filename of the .dt4 file (see Supplemental Files). day1N_20211129_154458.dt4 = "TimePeriod_YYYYMMDD_HHMMSS.dt4"	unitless	file_name
TransducerName	38 kHz 10° Split = Transducer frequency_Beam Angle_BeamType	unitless	instrument
TransducerNumber	ID of transducer. Only a BioSonics DTX Extreme 38 kHz transducer was used.	unitless	instrument
ReportNumber	Data were analyzed in '10 Ping bins', and Report Number is the nth bin analyzed	unitless	sample_descrip
FirstPingNumber	First ping of new report	unitless	sample_descrip
LastPingNumber	Last ping of new report	unitless	sample_descrip
BottomStatus	Valid/Invalid response outlining whether bottom could be detected	unitless	sample_descrip
BottomElevation_m	water depth	meters (m)	depth
PlantStatus	Valid/Invalid response outlining whether plant could be detected	unitless	sample_descrip
lat	Site latitude	decimal degrees	lat
lon	Site longitude	decimal degrees	lon
ISO_DateTime_UTC	DateTime with time zone (UTC) in 8601 format. Format: %Y-%m-%dT%H:%M:%S.%fZ	unitless	ISO_DateTime_UTC

Status message

Database

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Dataset: Echosounder data (38kHz)