Scientific echosounder data provide a predator’s view of Antarctic krill (Euphausia superba)

Raw and processed acoustic data were collected in East Antarctica from the RSV Aurora Australis during two surveys: the Krill Availability, Community Trophodynamics and AMISOR Surveys (KACTAS) and the Krill Acoustics and Oceanography Survey (KAOS) in the East Antarctic.


Seabed alias example file used to make Figure 3.

38_false_bottom.sv.csv (file size: 10.7 MB)

This file is an example of seabed aliasing (false bottom echo) that occurred during the KAOS survey. The data in this file are acoustic (mean volume backscattering strength, Sv) sample-by-sample and in a CSV format.

Ping_index - ping number

Distance_GPS - along track distance from the vessel’s GPS (nautical miles).

Distance_vl - along track distance from the vessel’s log (nautical miles). Not used here, so is populated by Echoview’s ‘don’t care’ value (-9.90E+37) to keep the file format consistent.

Ping_date - format yyyy-mm-dd

Ping_time - format hh:mm:ss


Ping_milliseconds - format (integer; ms)

Latitude - position from the vessel’s GPS (degrees)

Longitude position from the vessel’s GPS (degrees)

Depth_start - start depth of vessel echosounder logging range (m)

Depth_stop - stop depth of vessel echosounder logging range (m)

Range_start - start range of vessel echosounder logging range (m)

Range_stop - stop range of vessel echosounder logging range (m)

Sample_count number of samples in a ping.

Acoustic Sv samples follow in column-wise vector (dB re 1 m-1)


Transect metadata

all_transects.csv (file size: 14.8 K)

This is the transect metadata for both the KACTAS and KAOS surveys:

Transect - transect number

startDate - start date of transect dd/mm/yyyy

startTime - start time of transect hh:mm

endDate - end date of transect dd/mm/yyyy

endTime - end time of transect dd/mm/yyyy

Ping_subset - a ping subset specified between two timestamps to isolate acoustic data that occurred on transect , i.e start timestamp to stop timestamp (yyyy-mm-dd hh:mm = yyyy-mm-dd hh:mm).

Direction - Direction traveled along the transect (N - north or S- south).

Light - day or night when transect was observed

Survey - Either KACTAS or KAOS

Leg - Krill box 1 or 2 (there were two surveys only during the KAOS voyage).

Pass - Sampling bout for a transect in a given direction.


Example R-code

FigureAndDataprocessingExample.R (12KB)

This R-code provides examples of scripting acoustic data processing using EchoviewR, specifically, using ping-subsets to isolate acoustic data along a transect of interest, detecting schools and exporting echo integrations for 38, 120 and 200 kHz. The R-code for making the figures in the paper is also given.


GPS vessel positions for both the KACTAS and KAOS surveys

KACTASandKAOS_GPS.csv (3 MB)

This CSV file gives the vessel track for both the KACTAS and KAOS surveys.

GPS_date - dd/mm/yyyy

GPS_time - HH:MM:SS

GPS_milliseconds - integer

Latitude - position from the vessel’s GPS (degrees)

Longitude - position from the vessel’s GPS (degrees)

x - relative grid position (x) used for plotting Figure 1

y - relative grid position (y) used for plotting Figure 1

Survey - either: KACTAS_Krillbox, KAOS_Krillbox1, or KACTAS_Krillbox2


Krill swarms for both the KACTAS and KAOS surveys

KACTASandKAOSswarms.csv (2.1 MB)

Krill swarms descriptors for the KACTAS and KAOS surveys in CSV format (see Table 2 for description of the data fields).


Echoview file for the KACTAS survey

KACTAS-survey.EV (21.8 MB)

An Echoview file (version 12.0) for the KACTAS acoustic data analysis


KACTAS EK60 scientific echosounder calibration values

KACTAS_EK500_calibration.ecs 3,623 16/05/2022 21:21 -a--

An Echoview format calibration file for the KACTAS survey (see Table 3 for calibration values and Demer et al.20 for a description of the calibration parameters).


Echoview file for the KAOS survey

KAOS-survey.EV (16.4MB)

An Echoview file (version 12.0) for the KAOS acoustic data analysis


KAOS EK60 scientific echosounder calibration values

KAOS_EK60_calibration.ecs 5,711 01/11/2021 04:36 -a–

An Echoview format calibration file for the KAOS survey (see Table 3 for calibration values and Demer et al. (2015) for a description of the calibration parameters).

Simple

Identification info

Alternate title
Scientific echosounder data provide a predator’s view of Antarctic krill (Euphausia superba)
Date (Publication)
2022-11-23
Edition
1
Citation identifier
Dataset DOI

Title
Information and documentation - Digital object identifier system
Date (Publication)
2012-04-23
Citation identifier
ISO 26324:2012

Citation identifier
doi:10.26179/39x3-9267

Originator

Cox, M., Smith, A., Brierley, A.S., Potts, J.M., Wotherspoon, S. and Terauds, A.

Publisher

Australian Antarctic Data Centre

Principal investigator

COX, MARTIN
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Principal investigator

SMITH, ABIGAIL
Australian Antarctic Program Partnership
University of Tasmania
Hobart
Tasmania
7000
Australia

Principal investigator

BRIERLEY, ANDREW S
Scottish Oceans Institute
Gatty Marine Laboratory
University of St Andrews
East Sands
St Andrews
Fife
KY16 8LB
Scotland

Principal investigator

POTTS, JOANNE M
Secretariat of the Pacific Community,
CPS – B.P. D5, 98848
Noumea
98848
New Caledonia

Principal investigator

WOTHERSPOON, SIMON
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Principal investigator

TERAUDS, ALEKS TERAUDS
Australian Antarctic Division
203 Channel Highway
Kingston
TAS
7050
Australia

Collaborator

COX, MARTIN
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Collaborator

SMITH, ABIGAIL
Australian Antarctic Program Partnership
University of Tasmania
Hobart
Tasmania
7000
Australia

Collaborator

WOTHERSPOON, SIMON
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Collaborator

TERAUDS, ALEKS TERAUDS
Australian Antarctic Division
203 Channel Highway
Kingston
TAS
7050
Australia
Name
CAASM Metadata
Website
https://data.aad.gov.au/metadata/records/AAS_4636_KACTAS_KAOS_KRILL

Purpose
The two surveys, KACTAS and KAOS, were conducted to examine predator-prey relationships between air-breathing predators and Antarctic krill.
Status
Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Spatial resolution

Vertical sampling distance
0

Spatial resolution

Spatial resolution
5

Spatial resolution

Spatial resolution
5
Temporal resolution
PT1S
Topic category
  • Oceans
  • Biota

Extent

N
S
E
W


Extent

Description
Temporal Coverage

Temporal extent

TimePeriod
2001-01-14 2001-01-21

Extent

Description
Temporal Coverage

Temporal extent

TimePeriod
2003-01-16 2003-02-01

Extent

Description
Vertical Extent - Depth

Vertical element

Minimum value
0
Maximum value
250
Identifier
urn:x-ogc:def:cs:EPSG:6498
Name
Vertical CS. Axis: depth (D). Orientation: down. UoM: m.
Identifier
urn:x-ogc:def:axis:EPSG:113
Name
depth
NASA/GCMD Earth Science Keywords
  • EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS > EUPHAUSIIDS (KRILL)
  • EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > INDICATOR SPECIES
  • EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS
Keywords
  • SCIENTIFIC ECHOSOUNDERS EK500 AND EK60
  • SWARMS
  • DISTRIBUTION
  • VOLUMETRIC DENSITY
NASA/GCMD Earth Science Keywords
  • ECHO SOUNDERS
NASA/GCMD Earth Science Keywords
  • R/V AA > R/V Aurora Australis
NASA/GCMD Earth Science Keywords
  • AMD/AU
  • CEOS
  • AMD
NASA/GCMD Earth Science Keywords
  • GEOGRAPHIC REGION > POLAR
  • OCEAN > SOUTHERN OCEAN
  • CONTINENT > ANTARCTICA

Resource constraints

Use limitation
This metadata record is publicly available.

Resource constraints

Access constraints
licence
Other constraints
These data are publicly available for download from the provided URL.

Resource constraints

File type
Portable Network Graphic
Linkage
Creative Commons by Attribution logo

Title
Attribution 4.0 International (CC BY 4.0)
Website
https://creativecommons.org/licenses/by/4.0/legalcode

Legal code for Creative Commons by Attribution 4.0 International license

Use constraints
licence
Other constraints
This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4636_KACTAS_KAOS_KRILL when using these data.
Language
English
Character encoding
UTF8

Distribution Information

Distributor

Distributor

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Distributor

Fees
Free
Planned available datetime
2022-11-23T00:00:00
Units of distribution
MB
Transfer size
32
Distribution format
  • csv, R

OnLine resource
GET DATA > DIRECT DOWNLOAD

Download the dataset.

OnLine resource
PROJECT HOME PAGE

Public information for AAS project 4636

OnLine resource
VIEW RELATED INFORMATION

Citation reference for this metadata record and dataset.

Resource lineage

Statement
1. These active acoustic data are of a standard expected from data collected in the Southern Ocean. There are numerous examples of seabed aliasing ('false bottom') echoes found in the 38 kHz data collected during the KAOS survey. These echoes are expected from a high ping rate sampling over rapidly changing bathymetry and have been removed during data processing. 2. The volume estimates, and hence biomass estimates, of individual krill swarms should be used with caution: the volume estimates have been calculated assuming a cylindrical swarm shape, which is likely to underestimate swarm volume, so are best used as a relative measure.
Hierarchy level
Dataset
Maintenance and update frequency
As needed
Maintenance note
2022-09-09 - record created by Martin Cox. 2022-11-23 - record updated by Dave Connell to publicly release the data.

Metadata

Metadata identifier
string/AAS_4636_KACTAS_KAOS_KRILL

Language
English
Character encoding
UTF8

Author

COX, MARTIN
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Sponsor

Australian Antarctic Division

Owner

AADC

Type of resource

Resource scope
Dataset

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Citation identifier
772aab2e-5bde-4de4-8767-2e38608b3ddd

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Date (Last Revision)
2022-11-23T10:34:26

Identifier

Description
metadata.extraction_date

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Citation identifier
8.6

Metadata linkage
http://data.aad.gov.au/metadata/records/AAS_4636_KACTAS_KAOS_KRILL

Point of truth for the metadata record

Date info (Creation)
2022-09-09T00:00:00
Date info (Last Update)
2022-11-23

Metadata standard

Title
ISO 19115-3
Edition
2014
Other citation details
Version 1
Title
DIF to ISO 19115-1 Profile
 
 

Overviews

Spatial extent

N
S
E
W


Keywords


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