Vertical sections of in-situ temperature over 25 years in the Southern Ocean

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Gridded XBT temperature sections from the SURVOSTRAL project provide a unique multi-decadal observational dataset of temperature across the Southern Ocean from Hobart (Tasmania, 42.9°S, 147.3°E) to Dumont d’Urville (Adelie Land, 66.6°S, 140.0°E), starting in 1992. Gridded temperature sections are based on XBT temperature profiles collected each year during the summer heating cycle from early spring (Oct/Nov) to autumn (Mar), over the depth range from the surface down to 900 m.

XBT data were collected aboard the French supply vessel L’Astrolabe, with the support of the French Institut Polaire Emile Victor (IPEV), the LEGOS research laboratory, the CSIRO Marine and Atmospheric Research division. and the National Oceanic and Atmospheric Administration (NOAA).

This XBT section is part of the SOP (Ships of Opportunity) network and CLIVAR, and is referred to as section IX28 ( https://doi.org/10.18142/17 2 ).

The dataset consists of 25 years (November 1992 to February 2017) of 10238 expendable bathythermograph (XBT) profiles on this section between Hobart, Australia and Dumont d’Urville, Antarctica. Measurements are collected from an average of six transects per year between late October and early March.

Depending on ice and weather conditions, XBT measurements are sampled every 35km, with a finer 18km sampling across the energetic polar frontal region from 49°S to 54°S. Temperature profiles extend down to 900 meters depth with a vertical resolution of about 0.7 meters. The XBT temperature profile accuracy is +/-0.1°C. XBT profiles have been corrected for temperature and depth biases depending on the probe type. All corrected XBT measurements can be retrieved from the IMOS website ( http://thredds.aodn.org.au/thredds/catalog/IMOS/SOOP/SOOP-XBT/DELAYED/Line_IX28_Dumont-d-Urville-Hobart/catalog.html ).

Individual XBT profiles are then mapped onto a regular meridional-vertical section from North to South, following the mean path of the Astrolabe’s transect, with 0.5° resolution in latitude (increasing to 0.25° in the polar frontal zone from 49-54°S), with 2m depth resolution down to 800 m depth. XBT profiles sampled further than 3° in longitude from the mean path of the Astrolabe are removed from the analysis.

Different types of gridded products are available :

1) Climatological monthly mean temperature sections are calculated for each month during the austral summer ONDJFM period and averaged over 25 years (6 monthly mean temperature sections).

2) Austral summer (NDJF) mean temperature sections are constructed for each year from 1993 to 2017, allowing us to track the interannual temperature evolution (25 annual summer mean temperature sections).

3) Temperature values and anomalies measured for each profile of SURVOSTRAL program, gridded on mean path. Temperature anomaly profiles are constructed by subtracting the climatological monthly mean temperature value at each latitude and depth from each XBT profile. For detalis, see Auger et al. 2021.

 
Citation proposal
Elodie Kestenare () (2020) . Vertical sections of in-situ temperature over 25 years in the Southern Ocean. https://services.mspdata.eu:/geonetwork/srv/api/records/8cf36dda-1caf-47f4-b7c0-3bf696907c6e

Simple

Date ( Publication )
2020-07-01
Identifier

http://dx.doi.org/

/

10.6096/11

Credit

SURVOSTRAL

Status
Completed Completed

  Author

  Principal investigator

GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Oceanographic geographical features
Centre de données ODATIS ( Theme )

  • CDS-IS-OMP

Thèmatiques ODATIS ( Theme )

  • Value-added products

Variables ODATIS ( Theme )

  • /Physical Oceanography/Salinity

    ,

    /Physical Oceanography/Temperature

Type de jeux de donnée ODATIS ( Theme )

  • /In-situ observations/Networks

GCMD Keywords, version 8.1 ( Theme )

  • SALINITY

    ,

    DENSITY

    ,

    WATER TEMPERATURE

GCMD Keywords, version 8.1 ( Theme )

  • OCEAN > SOUTHERN OCEAN

GCMD Keywords, version 8.1 ( Theme )

  • SHIPS > R/V L'ASTROLABE

Use limitation

M. Auger, R. Morrow, E. Kestenare, J-B. Sallée, R. Cowley (2021): Southern Ocean in-situ temperature trends over 25 years emerge from interannual variability. Nature Communications, 12, 514. https://doi.org/10.1038/s41467-020-20781- 1


A user should acknowledge the use of the data by refering the publication Auger et al. (2021) and providing the DOI ( https://doi.org/10.6096/ 11)

Use limitation

The data are provided without any warranty for any non-profit educational and research purposes.

Other constraints

No access conditions apply

Metadata language
English
Topic category
  • Oceans
N
S
E
W


Reference system identifier

EPSG:4326

Distribution format

  • NetCDF

    ()

OnLine resource
Gridded Temp  
OnLine resource
http://dx.doi.org/10.6096/11  
Hierarchy level
Dataset Dataset

Conformance result

Date ( Publication )
2020-07-01
Explanation

NA

Pass
true
Statement

Data produced by the SURVOSTRAL program.

Metadata

File identifier
8cf36dda-1caf-47f4-b7c0-3bf696907c6e   XML
Metadata language
English
Character set
UTF-8 UTF8
Hierarchy level
Dataset Dataset
Date stamp
2021-12-01T12:00:05.800+01:00
 
 

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