Citation information for individual datasets is often provided in the metadata. However, not all datasets have this information embedded in the discovery metadata. On a general basis a citation of a dataset include the same components as any other citation:
author,
title,
year of publication,
publisher (for data this is often the archive where it is housed),
edition or version,
access information (a URL or persistent identifier, e.g. DOI if provided)
The information required to properly cite a dataset is normally provided in the discovery metadata the datasets.
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Brief user guide
The Data Access Portal has information in 3 columns. An outline of the content in these columns is provided above. When first entering the search interface, all potential datasets are listed. Datasets are indicated in the map and results tabulation elements which are located in the middle column. The order of results can be modified using the "Sort by" option in the left column. On top of this column is normally relevant guidance information to user presented as collapsible elements.
If the user want to refine the search, this can be done by constraining the bounding box search. This is done in the map - the listing of datasets is automatically updated. Date constraints can be added in the left column. For these to take effect, the user has to push the button marked search. In the left column it is also possible to specific text elements to search for in the datasets. Again pushing the button marked "Search" is necessary for these to take action. Complex search patterns can be constructed using logical operators through the drop down menu above the text field. Text strings that are not quoted are treated as separate words and will match any of the words (i.e. assuming the OR operator). Phrases may be prefixed with '-' to indicate no occurence of the phrase in the results.
Other elements indicated in the left and right columns are facet searches, i.e. these are keywords that are found in the datasets and all datasets that contain these specific keywords in the appropriate metadata elements are listed together. Further refinement can be done using full text, date or bounding box constraints. Individuals, organisations and data centres involved in generating or curating the datasets are listed in the facets in the right column.
The cruise was a joint campaign of the Nansen Legacy and A-TWAIN/SIOS-InfraNor projects. Within the Nansen Legacy, the cruise contributed primarily to the work package Physical Drivers (Research Foci 1) but also to Research Foci 2 and 3. The main objective of the cruise was the recovery and deployment of the projects moorings in the Barents Sea and north of Svalbard. These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-2135074338). The values have not be changed.
The cruise contributed to the work package Physical Drivers (Research Foci 1) with process studies to investigate the atmospheric, oceanographic, radiative and other physical controls on sea ice and stratification, with a general aim to identify and quantify the processes that control the heat budget north of Svalbard and in the Barents Sea. These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-940645003). The values have not be changed.
The Nansen Legacy cruise Q1 (Q1: 1st quarter of the year) was part of the seasonal investigation of the northern Barents Sea and adjacent Arctic Basin. The cruise was conducted in March 2021, and focused on comparing the physical, chemical and biological conditions along the Nansen Legacy main transect in open waters and within the sea ice. The cruise addressed objectives of the work packages Physical drivers (Research Foci 1), Human impact (Research Foci 2) and The living Barents Sea (Research Foci 3). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-1491279668). The values have not be changed.
The Nansen Legacy cruise Q2 (Q2: 2nd quarter of the year) was part of the seasonal investigation of the northern Barents Sea and adjacent Arctic Basin. The cruise was conducted during the spring period a biologically critical time window when a large part of the annual primary production occurs and focused on comparing the physical, chemical and biological conditions along the Nansen Legacy main transect in open waters and within the sea ice. The cruise addressed objectives of the work packages Physical drivers (Research Focus 1), Human impact (Research Focus 2), The living Barents Sea (Research Focus 3) and Technology and method development (Research Activity C). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-515075317). The values have not be changed.
The cruise addressed objectives of the work package Physical drivers (Research Focus 1), focusing on ocean mixing and water transformation process studies in the region east of Svalbard, with particular focus on the Barents Sea Polar Front region. These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-1643304797). The values have not be changed.
The Winter Process Cruise aboard RV Kronprins Haakon conducted dedicated observations on processes that control the position and variability of the Polar Front in the northern Barents Sea and the distribution of Arctic and Atlantic water masses. The cruise addressed objectives of the work packages Physical drivers (Research Focus 1) and Technology and method development (Research Activity C). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-814367946). The values have not be changed.
The cruise contributed to the work package Physical Drivers (Research Foci 1) with process studies to investigate the atmospheric, oceanographic, radiative and other physical controls on sea ice and stratification, with a general aim to identify and quantify the processes that control the heat budget north of Svalbard and in the Barents Sea. These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-940645003). The values have not be changed.
The Nansen Legacy cruise Q4 (Q4: 4th quarter of the year) was the second of in total four seasonal cruises to the northern Barents Sea and adjacent Arctic Basin. The cruise focused on comparing the state of the physical, chemical and biological conditions along the Nansen Legacy main transect in open waters and within the sea ice, addressing objectives of the work packages Physical drivers (Research Foci 1), Human impact (Research Foci2), The living Barents Sea (Research Foci 3), and Technology and method development (Research Activity C). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-301551919). The values have not be changed.
The Nansen Legacy cruise Q1 (Q1: 1st quarter of the year) was part of the seasonal investigation of the northern Barents Sea and adjacent Arctic Basin. The cruise was conducted in March 2021, and focused on comparing the physical, chemical and biological conditions along the Nansen Legacy main transect in open waters and within the sea ice. The cruise addressed objectives of the work packages Physical drivers (Research Foci 1), Human impact (Research Foci 2) and The living Barents Sea (Research Foci 3). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-1491279668). The values have not be changed.
The Winter Process Cruise aboard RV Kronprins Haakon conducted dedicated observations on processes that control the position and variability of the Polar Front in the northern Barents Sea and the distribution of Arctic and Atlantic water masses. The cruise addressed objectives of the work packages Physical drivers (Research Focus 1) and Technology and method development (Research Activity C). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-814367946). The values have not be changed.
The cruise was a joint campaign of the Nansen Legacy and A-TWAIN/SIOS-InfraNor projects. Within the Nansen Legacy, the cruise contributed primarily to the work package Physical Drivers (Research Foci 1) but also to Research Foci 2 and 3. The main objective of the cruise was the recovery and deployment of the projects moorings in the Barents Sea and north of Svalbard. These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-2135074338). The values have not be changed.
This dataset is a collection of the acid-corrected chlorophyll A and phaeopigments measurements taken as part of the Nansen Legacy project (www.arvenetternansen.com), as part of the '2021 Seasonal Study Q2' cruise. The data are from under ice water from an ice station at P6 (NLEG21/NPAL15) Ice taken on 2021-05-09T13:35:28.751Z at 30.8293846°E and 81.5625924833333°N. Both total Chlorophyll A and collected after passing through a 10µm filter are enclosed if available.
The Nansen Legacy cruise Q2 (Q2: 2nd quarter of the year) was part of the seasonal investigation of the northern Barents Sea and adjacent Arctic Basin. The cruise was conducted during the spring period a biologically critical time window when a large part of the annual primary production occurs and focused on comparing the physical, chemical and biological conditions along the Nansen Legacy main transect in open waters and within the sea ice. The cruise addressed objectives of the work packages Physical drivers (Research Focus 1), Human impact (Research Focus 2), The living Barents Sea (Research Focus 3) and Technology and method development (Research Activity C). These data are created from the CTD data published by NMDC for the whole cruise (https://doi.org/10.21335/NMDC-515075317). The values have not be changed.
This dataset is a collection of bacterial production measurements (rate of production of biomass expressed as carbon by prokaryotes [bacteria and archaea]) taken as part of the Nansen Legacy project (www.arvenetternansen.com), as part of the '2019 Seasonal Study Q3' cruise (2019706). The data are collected from CTD with Niskin bottles from station P4 (NLEG11) taken on 2019-08-14T07:24:00Z at 79.69320N and 34.230E.
As a part of the Nansen Legacy project, ocean microstructure data were collected using an MSS (Microstructure Sensor Profiler, Sea&Sun Technology, Germany) profiler during the Nansen Legacy cruise, KH2021702 in February 2021. The goal was to conduct ocean mixing and water transformation process studies in the Barents Sea Polar Front region east of Svalbard, in the northern Barents Sea. During the cruise, we obtained 181 microstructure profiles (23 of which were obtained from a drifting ice floe). Nine casts were aborted and not processed. Out of the processed 172 files, 181 sections were extracted and supplied in the grouped NC files (i.e., one profile cast can have multiple sections of profiles interrupted, for example, by a gap when the instrument did not fall freely; it is a coincidence that the number of sections matches the number of attempted casts).
Here we provide 172 NetCDF (NC) files (one NC file per instrument's native file) compressed in one folder, as well as 2 NC files, one for profiles of CTD and a second one for profiles of dissipation rates, collated for the entire cruise.
The converted data are prepared following the SCOR Working Group 160, ATOMIX guidelines and convention (https://wiki.uib.no/atomix).
Files per cast: CAST0001.nc to CAST0181.nc (except casts 3, 35, 39, 125, 138 and 140)
The NC files per instrument's native file include five groups. 4 levels of microstructure data in ATOMIX format and a CTD group, derived from the MSS’s CTD sensors.
L1_converted: full resolution 1024 Hz sampled data converted to physical units
L2_cleaned: data at full resolution from the shear probes and the vibration sensor that are filtered and despiked before spectral analysis. Time stamp and length of the signals are same as L1.
L3_spectra: wavenumber spectra from shear probes and vibration sensors
L4_dissipation: dissipation estimates together with quality control parameters
CTD: 0.1dbar vertically averaged CTD profiles obtained from the precision sensors
Detailed attributes and metadata are given at the global level as well as at the group level, including choices of processing parameters. For detailed information on the parameter names, description, and processing choices, the user is referred to https://wiki.uib.no/atomix. CTD profiles are 0.1 dbar vertically averaged. Dissipation estimates are from half-overlapping 6 s segments, using 2-s spectral calculations. The practical salinity obtained from the MSS is corrected against the shipboard SBE-911plus CTD system (calibrated against salinity water samples), using an offset correction of Scorrected = Smeasured - 0.018.
The motivation for providing the full-resolution data is that the user can reprocess the data with their own routines if needed (either from the time series level or from spectra level). A user interested in CTD and dissipation rate profiles may find the collated two NC files more practical and easily accessible.
Data quality flags are provided for dissipation estimates (L4) and for the CTD profiles. A final dissipation estimate failing the data quality control is reported as not-a-number (NaN); however, the individual dissipation estimates from each probe are accessible in the L4 data. Data quality flags in the CTD profile are not applied, except for the data transmission errors when there is no data. We also suspect unreliable data in the upper water column in some profiles, which we did not flag but left for the user's discretion.
Collated files:
Because each file includes full-resolution data at two levels and full-resolution spectra in the third group, the grouped NC files are large in size and may be unpractical to download and merge. Furthermore, the grouped NC structure is non-standard for some users. For users only interested in the dissipation and CTD profiles, we also provide two separate NC files with all sections from the L4_dissipation and CTD groups collated into one file each.
Out of a total of 172 NC files, there are 181 sections. A section is a more general term for a profile and is a continuous segment of the time series with dissipation estimates. One profile cast can have multiple sections if, for example, the profile is interrupted by a gap when the instrument did not fall freely.
MERGED_CTD.nc: collated from the CTD group
MERGED_EPSI.n: collated from the L4_dissipation group
Data quality flags from the groups are applied to the collated profiles. We also suspect unreliable data in the upper water column in some profiles, which we did not flag but left for the user's discretion. Parameters in the MERGED files are filled with NaNs to a common maximum depth or section duration, hence are in uniform dimension size, to allow easy handling of the data. Note, however, the data are not gridded in time or pressure. Each data point has its own time stamp and pressure value.