NERC Data Catalogue Service
Antarctic krill (Euphausia superba) biomass density estimates derived from acoustic backscatter data collected in the Western Core Box survey, South Georgia, South Atlantic: 1996 - 2019
This dataset contains processed acoustic backscatter data that reflect integrated density estimates for Antarctic krill (Euphausia superba). The acoustic backscatter data are from the Western Core Box (WCB), comprising 8 acoustic transects that span the shelf-break at South Georgia. The data were obtained from a time series of 22 cruises carried out between 1996/97 and 2019/20. Data were collected using either a Simrad EK500 or EK60 echo sounder by biological oceanographers working at the British Antarctic Survey under the Ecosystems scientific research programme and predecessor Discovery 2010 and Dynamo research programmes.
Funding was provided by the NERC/BAS Antarctic, Logistic, Infrastructure (ALI) Science and predecessor Long Term Monitoring Science research programmes.
Simple
- Date (Creation)
- 2022-09-27
- Date (Revision)
- 2022-09-27
- Date (Publication)
- 2022-09-27
- Date (released)
- 2022-09-27
- Edition
- 1.0
- Unique resource identifier
- https://doi.org/10.5285/e85a9312-8531-4261-a2f6-1c58f40cfc71
- Codespace
- doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01671
- Codespace
- https://data.bas.ac.uk/
- Other citation details
- Please cite this item as: Fielding, S., Enderlein, P., Stowasser, G., Tarling, G., & Manno, C. (2022). Antarctic krill (Euphausia superba) biomass density estimates derived from acoustic backscatter data collected in the Western Core Box survey, South Georgia, South Atlantic: 1996 - 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/e85a9312-8531-4261-a2f6-1c58f40cfc71
- Credit
- No credit.
- Status
- completed Completed
https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/
- Maintenance and update frequency
- asNeeded As needed
- Maintenance note
- completed Completed
- Theme
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- Acoustic backscatter
- Antarctic krill
- EK500
- EK60
- Euphausia superba
- Scotia Sea
- South Georgia
- WCB
- Western Core Box
- Place
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- Scotia Sea Southern Ocean
- South Georgia Southern Ocean
- GEMET - INSPIRE themes, version 1.0
- Access constraints
- otherRestrictions Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- otherRestrictions Other restrictions
- Other constraints
- no limitations
- Use constraints
- license License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- otherRestrictions Other restrictions
- Other constraints
- Data are released under Open Government Licence V3.0:
- Use constraints
- otherRestrictions Other restrictions
- Other constraints
- No restrictions apply.
- Unique resource identifier
- url
- Codespace
- url
- Association Type
- crossReference Cross reference
- Unique resource identifier
- doi
- Codespace
- doi
- Association Type
- crossReference Cross reference
- Unique resource identifier
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- Codespace
- doi
- Association Type
- crossReference Cross reference
- Unique resource identifier
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- Codespace
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- crossReference Cross reference
- Unique resource identifier
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- Codespace
- doi
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- crossReference Cross reference
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- Codespace
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- crossReference Cross reference
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- Codespace
- url
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- crossReference Cross reference
- Unique resource identifier
- url
- Codespace
- url
- Association Type
- crossReference Cross reference
- Spatial representation type
- textTable Text, table
- Metadata language
- engEnglish
- Character set
- utf8 UTF8
- Topic category
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- Biota
- Environment
- Oceans
))
- Begin date
- 1996-12-29
- End date
- 2019-12-07
- Supplemental Information
- It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.
Distributor
https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/
- Name
- text/plain
- Name
- text/csv
- Units of distribution
- bytes
- Transfer size
- 2010112
- OnLine resource
-
Get Data
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WWW:LINK-1.0-http--link
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Download data
- Units of distribution
- bytes
- Transfer size
- 2010112
- OnLine resource
-
Get Data
(
WWW:LINK-1.0-http--link
)
Download data
- Hierarchy level
- dataset Dataset
- Statement
-
Methodology:
Acoustic surveys targeting Antarctic krill (Euphausia superba) within the Western Core Box (WCB; an area covering 132 km by 80 km) to the northwest of South Georgia have been described previously (Trathan et al., 2003; Reid et al., 2010; Fielding et al., 2014). Here we extend the time series from 1997 to 2020, using only acoustic surveys that took place within a fixed time window (1 December to 16 February), given that known intra-annual variation in the timing of peak summer biomass can affect estimates of krill mean density at South Georgia (Saunders et al., 2007; Reid et al., 2010). The WCB includes on-shelf and off-shelf areas sometimes used by predators foraging from Bird Island.
During each survey, acoustic data were collected along eight transects, although in some years not all transects could be completed. Also, the location of some transects changed after the first few years. Acoustic data were depth integrated to 250 m (or to 2 m above the sea floor if shallower) with a horizontal average integration distance of 500 m.
Estimate of krill density in each acoustic sampling interval were derived using the 3 frequency (38, 120 and 200 kHz) identification model and the ASAM TS model (Fielding et al., 2011; 2014; 2016).
- File identifier
- e85a9312-8531-4261-a2f6-1c58f40cfc71 XML
- Metadata language
- engEnglish
- Character set
- utf8 UTF8
- Hierarchy level
- dataset Dataset
- Hierarchy level name
- dataset
- Date stamp
- 2022-09-27
- Metadata standard name
- ISO 19115 Geographic Information - Metadata
- Metadata standard version
- ISO 19115:2003(E)
https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/
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