NERC Data Catalogue Service
Acoustic backscatter and environmental data for the Scotia Sea, Southern Ocean 2006, 2008, 2009, 2015, 2016 and 2017
This is data set held in two csv files, one DATA file contains the data and an accompanying NOTES file that provides additional detail on abbreviations. It contains processed acoustic backscatter (NASC) data that is coupled with environmental data. Acoustic backscatter data is from 13 acoustic transects spanning the Scotia Sea and major Southern Ocean fronts, obtained during cruises JR161, JR177, JR200, JR15002, JR15004 and JR16003 (2006-2017). Data were collected using a Simrad EK60 echo sounder at 38 kHz. The EK60 was run continuously between Stanley (Falkland Islands) and Signy (South Orkney Islands), Stanley and South Georgia. Environmental data includes: sea surface temperature, bathymetry, geopotential height, geostrophic current speeds, sea ice concentration, sea ice zone, time of day (day/night), sea temperature at 200m, distance to coast, net primary productivity, and hours of daylight. Environmental data are compiled from external data sources.
Funding was provided by the NERC grants NE/L002434/1 and bas010017.
Simple
- Alternate title
- Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01594
- Date (Publication)
- 2021-12-17
- Identifier
- http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01594
- Maintenance and update frequency
- unknown Unknown
- Keywords
-
- NDGO0001
- NERC OAI Harvesting
-
- NERC_DDC
- GCMD Parameter Valids
-
- EARTH SCIENCE > Oceans > Marine Environment Monitoring
- EARTH SCIENCE > Oceans > Ocean Acoustics
- BAS Free-text keywords
-
- Acoustic backscatter
- EK60
- Scotia Sea
- Southern Ocean
- oceanographic data
- Use limitation
- Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
- Access constraints
- otherRestrictions Other restrictions
- Other constraints
- Data released under Open Government Licence V3.0: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
- Metadata language
- EnglishEnglish
- Topic category
-
- Environment
- Oceans
))
- Begin date
- 2006-10-25
- End date
- 2017-01-08
- Reference system identifier
- OGP / urn:ogc:def:crs:EPSG::4326
- Distribution format
-
- Protocol
- http
- Name
- GET DATA
- Function
- download Download
- Hierarchy level
- dataset Dataset
Domain consistency
- Measure identification
- INSPIRE / Conformity_001
Conformance result
- Date
- Explanation
- See the referenced specification
- Pass
- No
- Statement
-
The acoustic data was calibrated at least once per field season using standard calibration spheres and methods (Demer et al. 2015). The data was cleaned in Echoview to remove bad data regions, including false bottom echoes, seabed, surface near-field, intermittent noise and attenuated signal (all set to ''no-data''). Data was integrated in 1km distance by 10m depth cells. Further removal of data in water shallower than 1000m was carried out in R version 3.5.3 and the top 1% of high NASC values were manually scrutinised to check for any residual noise bias. Less than 10% of high NASC values were found to be attributable to noise and these were excluded from further analysis.
For environmental data coupled with NASC, Environmental data was extracted at the location of NASC using r package raster (Hijmans, 2018). The majority of climatology data was already in WGS84 projection, with the exception of Sea Icea and NPP data which were reprojected rasterProject() funtion with bilinear interpolation.
- File identifier
- GB_NERC_BAS_PDC_01594 XML
- Metadata language
- EnglishEnglish
- Hierarchy level
- dataset Dataset
- Date stamp
- 2021-12-17
- Metadata standard name
- NERC profile of ISO19115:2003
- Metadata standard version
- 1.0
Overviews
Spatial extent
Provided by
