EMODnet product catalogue
Ross Ice Shelf Cavity Ocean Data
Here we provide data from the Ross Ice Shelf ocean cavity. Location - The HWD2 Camp was established in October of 2017 at 80o 39.497’S, 174o 27.678’E where the ice is moving seaward at around ~600 m a-1 and is sourced from the Transantarctic Mountains. Profiling Instruments - Profiling was primarily conducted with an RBR Concerto CTD (conductivity-temperature depth) profiling instrument, and this was cross-calibrated against irregular profiles with an RBR Duet (pressure and temperature only), a SBE37 MicroCat CTD as well as moored SBE37 MicroCat CTDs. The RBR unit is small and has suitable sensor capability (temperature and conductivity accuracies of ±0.002°C and ±0.003 mS cm-1). Its conductivity cell design is not prone to fouling by ice crystals, making it ideal for work in the sometimes crystal-laden borehole conditions. We were inconsistent in how we mounted the CTD on its protective frame and this appeared to make small difference in the conductivity signal (resulting in an ~0.03 psu variation). This was post-corrected based on the essentially invariant mooring data from the lower water column as well as SBE37 cross-calibration profile data. Because of the potential for sediment contamination of the sensors, the profiles were mostly conservative in their proximity to the sea floor. On several occasions, profiles were conducted all the way to the sea floor. The temperature and salinity are presented in EOS-80 in order to compare with available data. Eighty three profiles are provided here (ctd_HWD2_*.dat). In addition, limited microstructure profiling was conducted to provide insight into some of the mixing details. The profiles were conducted by lowering the instrument to the ice base then commencing a sequence of three up-down “yo-yos” before returning to the surface and downloading. A data segment is included here (VMP_HWD2.dat). There were some challenges registering the vertical coordinate for the profiles. The melting of the borehole generates a trapped pool of relatively fresh water. The interface between this and the ocean should be near the base of the hole or a little higher – with seawater intrusion. However, there were some instances where the interface was at a higher pressure (i.e. apparently in the open water column). The best explanation for this is that the water in the borehole is not at static equilibrium for some period after initial melting. We use 34.3 psu as a cut-off, in addition to a pressure criterion to identify the top of the useful oceanic profile. It is also not inconceivable that water was being ejected from the hole, but it is unlikely that this would have impacted in the consistent observed pattern. Instrumented Mooring - The mooring instruments at HWD2-A comprised 5 Nortek Aquadopp single point current meters in titanium housings reporting to the surface (30-minute interval, Table SI-Three) via an inductive modem to a Sound-9 data logger and Iridium transmitter. The current meter measurements were corrected to account for the 138o magnetic declination offset (i.e. the south magnetic pole is to the north-west of the field site). Five files are provided here (HWD2_Init_rcm*.dat4). Details in: Stevens C, Hulbe C, Brewer M, Stewart C, Robinson N, Ohneiser C and Jendersie J, 2020. Ocean mixing and heat transport processes observed under the Ross Ice Shelf controls its basal melting, accepted PNAS, May 2020.
Important Note: This submission has been initially submitted to SEA
scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI.
The metadata elements have been further processed (refined) in EMODnet
Ingestion Service in order to conform with the Data Submission Service
specifications.
Simple
- Date (Creation)
- 2017-12-01
- Date (Revision)
- 2020-06-05
- Date (Publication)
- 2020-12-14
- Date (Publication)
- 2022-10-14
- Citation identifier
- a53ad03f-3734-7343-3431-000000074128
- Code
- DOI:10.17882/74128
- Other citation details
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Stevens Craig, Brewer Mike, Grant Brett (2017). Ross Ice Shelf Cavity Ocean Data. SEANOE. https://doi.org/10.17882/74128
- Point of contact
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Organisation name Individual name Electronic mail address Role SEA scieNtific Open data Edition Publisher Ifremer, Scientific Information Systems for the sea Dataset Holding Organisation Ifremer, Scientific Information Systems for the sea Author
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- no limitations to public access
- Use limitation
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Conditions for access and use apply
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CC-BY 4.0
- Character set
- UTF8
- Topic category
-
- Oceans
- Begin date
- 2017-12-03
- End date
- 2018-02-27
))
Vertical extent
- Minimum value
- 325
- Maximum value
- 620
- Unique resource identifier
- WGS 1984
Spatial representation info
- Name
- OnLine resource
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Protocol Linkage Name WWW:DOWNLOAD-1.0-http--download
https://cloud.emodnet-ingestion.eu/index.php/s/L4NX8C4kQQYwz6D WWW:LINK-1.0-http--link
data-marineinsitu.ifremer.fr/glo_multiparameter_nrt/history/CT/GL_PR_CT_EXEI0031.nc WWW:LINK-1.0-http--link
www.emodnet-physics.eu
- Hierarchy level
- Dataset
Conformance result
- Title
-
COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- No
Conformance result
- Title
-
Corrigendum to INSPIRE Metadata Regulation published in the Official Journal of the European Union, L 328, page 83
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- No
Conformance result
- Title
-
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Date (Publication)
- 2010-12-08
- Explanation
-
See the referenced specification
- Pass
- No
- Statement
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Processed data|The HWD2 Camp was established in October 2017 following from a site surveyin 2015. On 5 December 2017 the camp location was 80°39.497'S, 174°27.678'E where the ice is moving seaward at around~600 m a-1(49) and is sourcedfrom the Transantarctic Mountains (50). Ground-based seismic surveying hasrevealed the large-scale subshelf bathymetry (51), altimetry provides esti-mates of ice shelf draft (52), and cavity volume estimated from numericalrepresentations suggest a volume of around 130×103km3(4). However,significant uncertainty remains in the cavity geometry (53). This has impli-cations for topographically guided ocean circulation, at both the seafloorand basal boundary.The HWD2 site is in a modest local minimum in terms of ice thickness. Two 25-cm initial diameter boreholes were melted usinga hot water drill (based on a design described in ref. 54). The first borehole(HWD2-A) was used for initial camera inspection and a conductivity–temperature–depth (CTD) profile after which an instrumented mooring wasdeployed. The mooring included Nortek current meters and Seabird SBE 37CTD instruments. A second borehole (HWD2-B), 500 m to the south along anice flow trajectory, was kept open for 12 d (9 to 20 December 2017) and usedfor all subsequent CTD profiles as well as bottle-sampling for oxygen isotopeanalysis. The majority of the profiling was with an RBR Concerto CTD andwas sufficiently well resolved to allow estimation of overturn scales. SomeStevens et al.PNAS|July 21, 2020|vol. 117|no. 29|16803EARTH, ATMOSPHERIC,AND PLANETARY SCIENCESDownloaded by guest on November 26, 2020
additional profiles were recorded with a Rockland microstructure profiler.
Metadata
- File identifier
- a53ad03f-3734-7343-3431-000000074128 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2025-05-07T00:00:00
- Metadata standard name
-
ISO 19115:2003/19139
- Metadata standard version
-
1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role National Institute of Water and Atmospheric Research Point of contact
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