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Dataset Overview | National Centers for Environmental Information (NCEI)

Sea water temperature, salinity, and others collected by gliders SG643 and SG640 in the South Atlantic and Southern Oceans from 2018-12-14 to 2020-02-17 (NCEI Accession 0244004)

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This dataset is a hydrographic survey collected by sensors mounted on gliders in the Weddell Sea sector of the Antarctic Marginal Ice Zone, as part of the Robotic Observations and Modeling of the Marginal Ice Zone (ROAMMIZ) project. The gliders, SG643 (Caltech) and SG640 (Gothenburg University), were deployed from the research vessel SA AGULHAS II in the austral summer of 2018 and spring of 2019, respectively. Each of the profiles provide temperature, salinity, dissolved oxygen, fluorescence, optical backscatter (at 470 and 700 nm) and Depth Averaged Currents. The deployment in 2018 also includes PAR. Data were measured to a depth of 1000 m except for fluorescence and backscatter which recorded to a depth of 400 m. Horizontal resolution ranges from 300 m to 5000 m as a result of the V-shaped sampling pattern characteristic of gliders. The concatenated files provide processed and calibrated temperature, salinity, chlorophyll and backscatter data using near-by CTD casts on deployment and recovery of the gliders. The individual profiles have been processed on the Kongsberg basestation and the thermal lag correction of Charlie Erickson (unpublished) applied, but the data is otherwise not post-calibrated. The raw data of SG643 is also provided in case the user would like to re-process the data. Otherwise, the data are in NetCDF.

Data were collected with support from ROAMMIZ Project; Terrestrial Hazard Observations and Reporting (THOR) Center and Linde Center at Caltech; Packard Foundation.
  • Cite as: Swart, Sebastiaan; Giddy, Isabelle S.; Biddle, Louise; du Plessis, Marcel; Nicholson, Sarah-Anne; Thompson, Andrew F. (2021). Sea water temperature, salinity, and others collected by gliders SG643 and SG640 in the South Atlantic and Southern Oceans from 2018-12-14 to 2020-02-17 (NCEI Accession 0244004). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0244004. Accessed [date].
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  • Originator data format
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Distributor NOAA National Centers for Environmental Information
+1-301-713-3277
ncei.info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Time Period 2018-12-14 to 2020-02-17
Spatial Bounding Box Coordinates
West: -1
East: 1
South: -61
North: -55
Spatial Coverage Map
General Documentation
Associated Resources
  • Swart, S., du Plessis, M. D., Thompson, A. F., Biddle, L. C., Giddy, I., Linders, T., Mohrmann, M., & Nicholson, S. (2020). Submesoscale Fronts in the Antarctic Marginal Ice Zone and Their Response to Wind Forcing. Geophysical Research Letters, 47(6). https://doi.org/10.1029/2019gl086649
  • Giddy, I., Swart, S., du Plessis, M., Thompson, A. F., & Nicholson, S. ‐A. (2021). Stirring of Sea‐Ice Meltwater Enhances Submesoscale Fronts in the Southern Ocean. Journal of Geophysical Research: Oceans, 126(4). https://doi.org/10.1029/2020jc016814
Publication Dates
  • publication: 2021-12-15
  • creation: 2021-12-09
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status Complete - production of the data has been completed
Historical archive - data has been stored in an offline storage facility
Data Update Frequency As needed
Purpose These data were collected as part of an ongoing research project (ROAMMIZ) to understand upper ocean processes in the Antarctic Marginal Ice Zone.
Use Limitations
  • accessLevel: Public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Dataset Citation
  • Cite as: Swart, Sebastiaan; Giddy, Isabelle S.; Biddle, Louise; du Plessis, Marcel; Nicholson, Sarah-Anne; Thompson, Andrew F. (2021). Sea water temperature, salinity, and others collected by gliders SG643 and SG640 in the South Atlantic and Southern Oceans from 2018-12-14 to 2020-02-17 (NCEI Accession 0244004). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0244004. Accessed [date].
Cited Authors
Principal Investigators
Collaborators
Contributors
Resource Providers
Points of Contact
Publishers
Acknowledgments
  • Funding Agency: Wallenberg Academy Fellowship
  • Funding Agency: Swedish Research Council
Theme keywords NODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
Global Change Master Directory (GCMD) Science Keywords Provider Variable Names
  • Depth Averaged Currents
Data Center keywords NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords
Platform keywords NODC PLATFORM NAMES THESAURUS Global Change Master Directory (GCMD) Platform Keywords ICES/SeaDataNet Ship Codes
Instrument keywords NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords Provider Instruments
  • Aandera Optode
  • CT-Sail mounted on a Seaglider
  • Sea-Bird CT-Sail mounted on a Seaglider
  • Sea-Bird Eco Puck mounted on a Seaglider
Place keywords NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords
Project keywords Provider Projects
Keywords NCEI ACCESSION NUMBER
Keywords Send2NCEI Submission Package ID
  • JWEDJ7
Use Constraints
  • Cite as: Swart, Sebastiaan; Giddy, Isabelle S.; Biddle, Louise; du Plessis, Marcel; Nicholson, Sarah-Anne; Thompson, Andrew F. (2021). Sea water temperature, salinity, and others collected by gliders SG643 and SG640 in the South Atlantic and Southern Oceans from 2018-12-14 to 2020-02-17 (NCEI Accession 0244004). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0244004. Accessed [date].
Access Constraints
  • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees
  • In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
Lineage information for: dataset
Processing Steps
  • 2021-12-15T00:31:10Z - NCEI Accession 0244004 v1.1 was published.
Output Datasets
Lineage information for: dataset
Processing Steps
  • Parameter or Variable: Sea water temperature (measured); Units: Degrees Celcius; Observation Category: in situ; Sampling Instrument: Sea-Bird CT-Sail mounted on a Seaglider
  • Parameter or Variable: Sea water salinity (measured); Units: g/kg; Observation Category: in situ; Sampling Instrument: Sea-Bird CT-Sail mounted on a Seaglider; Sampling and Analyzing Method: Salinity computed from temperature, pressure and conductivity and corrected for thermal lag using the correction by Charlie Erickson (unpublished).
  • Parameter or Variable: CHLOROPHYLL A (calculated); Units: g/m3; Observation Category: in situ; Sampling Instrument: Sea-Bird Eco Puck mounted on a Seaglider; Sampling and Analyzing Method: Fluorescence converted to chlorophyll-a using the factory scale constant and then calibrated to shipboard bottle samples, after which the data was quenching-corrected
  • Parameter or Variable: OPTICAL BACKSCATTER (measured); Units: 1/m; Observation Category: in situ; Sampling Instrument: Sea-Bird Eco Puck mounted on a Seaglider; Sampling and Analyzing Method: Raw backscattering was converted to volume scattering at angle (124 degrees) and wavelength (470, 700 nm) specific to the sensors. The volume-scattering function of seawater was calculated according to Zhang, Hu, and He (2009) and subtracted from the profiles to yield scattering due to particles only. The result was multiplied by 2 and the angle dependent scale factor, 1.076 for the FLNTU scattering sensors and,  finally added to the backscattering co-efficient of seawater to yield the particulate backscattering coefficients bbp470 and bbp700. The data was dark corrected by subtracting the 95th percentile of backscatter between 200 and 400 m.
  • Parameter or Variable: WATER DENSITY (calculated); Units: kg/m3; Observation Category: in situ; Sampling Instrument: CT-Sail mounted on a Seaglider; Sampling and Analyzing Method: Sea water density was derived from temperature and salinity using Gibbs Sea Water Toolbox
  • Parameter or Variable: FLUORESCENCE (measured); Units: RFU; Observation Category: in situ; Sampling Instrument: Sea-Bird Eco Puck mounted on a Seaglider
  • Parameter or Variable: Depth Averaged Currents (measured); Units: m/s; Observation Category: in situ; Sampling Instrument: Seaglider
  • Parameter or Variable: PHOTOSYNTHETIC ACTIVE RADIATION (PAR) (measured); Units: micro-Einsteins/m2/s; Observation Category: in situ; Sampling Instrument: PAR Sensor; Sampling and Analyzing Method: PAR (microV) was scaled to  microEinsteins/m2/s and corrected for the factory dark count. The top 5 m of PAR measurements were deemed unreliable and removed, following which the profile was algebraically recalculated using an exponential equation to derive surface PAR values.
  • Parameter or Variable: DISSOLVED OXYGEN (measured); Units: mg/L; Observation Category: in situ; Sampling Instrument: Aandera Optode; Data Quality Method: These data have not been QC'd
Acquisition Information (collection)
Instrument
  • CTD
  • PAR Sensor
Platform
  • S.A. AGULHAS II
  • SG640
  • SG643
Last Modified: 2025-05-16T15:37:55Z
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