Dataset: SWARM AMLR moorings - acoustic data

Name: Acoustic data from two subsurface moorings deployed near Palmer Deep Canyon from January to March 2020
Published: 2022-04-12
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.872729.1

Spatial Extent: N:-64.8124 E:-64.0376 S:-64.864 W:-64.2119

Temporal Extent: 2020-01-06 - 2020-03-07

Project:

Collaborative Research: Physical Mechanisms Driving Food Web Focusing in Antarctic Biological Hotspots (Project SWARM)

Principal Investigator:

Joshua Kohut (University of Delaware)

Co-Principal Investigator:

George Cutter (NOAA Fisheries Antarctic Ecosystem Research Division)

Christian Reiss (NOAA Fisheries Antarctic Ecosystem Research Division)

Contact:

Katherine Hudson

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2022-04-12

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Acoustic data from two subsurface moorings deployed near Palmer Deep Canyon from January to March 2020

Abstract:

This dataset contains acoustic data from two subsurface moorings deployed near Palmer Deep Canyon from January to March 2020.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2022-04-12	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.872729.1	2022-04-13

Description

Each mooring has three data files associated with it:
1) an "_Sv" file containing the processed acoustic return from the mooring in volume backscattering strength in decibels (dB) from the 120 kHz narrowband echosounder in a matrix where rows represent single pings and columns indicate depth bins;
2) a "_dp" file representing the depth (in meters) of the depth bins for each return with the same dimensions as the "_Sv" file; and
3) a "_tm" file containing a vector of timestamps corresponding to each ping in seconds since Jan 1 1970 (POSIX), where the length of the vector is equivalent to the number of rows in each matrix.

These files are all available in the attached "all_moorings_files.tar.gz" file.

Methods & Sampling

One mooring was deployed to the eastern (AMLR2) and western (AMLR1) sides of Palmer Deep Canyon to 400 and 345 m, respectively. AMLR1 was deployed at -64.2119, -64.8124 (longitude/latitude) and AMLR2 was deployed at -64.0376, -64.864.

Both moorings were deployed on 6 January 2020. The western mooring was recovered on 3 February and the eastern mooring was recovered on 7 March 2020. The upward facing echosounders pinged at 6 s intervals and had 1168 vertical bins representing 0.375 m in range. These datasets include the 120 kHz returns.

Data Processing Description

Data Processing:
Raw data were processed using the methods outlined in Cutter et al., 2022. Individual .mat files that resulted from processing procedures were concatenated in R by row using rbind to produce single acoustic return (Sv), time, and depth files for each mooring. Time was transformed from Julian day to POSIX time in R. Data processing methods can be found in Cutter, et al. (2022).

BCO-DMO Processing:
- saved the csv files in a single .tar.gz file

Data Files

File

all_moorings_files.tar.gz

(GZIP (.gz), 10.08 GB)
MD5:c994903679d89f43f5c5169965599315

This package contains 6 .csv files.

Those named starting with "AMLR1" are from the AMLR1 mooring, located on the western (AMLR1) side of Palmer Deep Canyon at 345 meters. AMLR1 was deployed at -64.2119, -64.8124 (longitude/latitude).

Those named starting with "AMLR2" are from the AMLR2 mooring, located on the eastern (AMLR1) side of Palmer Deep Canyon at 400 meters. AMLR2 was deployed at -64.0376, -64.864 (longitude/latitude).

Each mooring has three data files associated with it:

1) an "_Sv" file containing the processed acoustic return from the mooring in volume backscattering strength in decibels (dB) from the 120 kHz narrowband echosounder in a matrix where rows represent single pings and columns indicate depth bins;

2) a "_dp" file representing the depth (in meters) of the depth bins for each return with the same dimensions as the "_Sv" file; and

3) a "_tm" file containing a vector of timestamps corresponding to each ping in seconds since Jan 1 1970 (POSIX), where the length of the vector is equivalent to the number of rows in each matrix.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1744884
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1745009
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1745011
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1745018
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1745023
NSF Office of Polar Programs (formerly NSF PLR)	OPP-1745081

Deployments

None available yet

Instruments

Nortek Signature 100 Acoustic Doppler Current Profiler

Supplied Description:

Nortek Signature 100 echosounders SNs 101132 and 101134

Instrument Type

Generic Name: Nortek Signature 100 Acoustic Doppler Current Profiler

Generic Description:

A long-range current profiler designed for combined current profile and biomass measurements. The Signature100 combines a four-beam current profiler operating at 100 kHz with an optional scientific echosounder. Applications include providing insight into the dynamics of zooplankton, krill or schools of fish; current profiling; providing insight into small-scale physical processes; and upwelling and downwelling studies. The instrument is suitable for buoy mounting with internal attitude and heading reference system (AHRS). Optional centre beam with 70-120 kHz Both the current profiler and the biomass measurements have an effective range of 300-400 m. The echosounder has a velocity resolution of 0.1 cm/s, a maximum sampling rate of 1 Hz (1/2 Hz at max output power), and a standard range of 0-1500 m.

Parameters

None available yet

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Database

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Dataset: SWARM AMLR moorings - acoustic data