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.
Particle absorption coefficients (m-1) in seawater and sea ice. Samples were filtered onto 0.7 µm glassfiber filters and stored in -80 °C until analysis. Filters were measured between 240 and 800 nm with a Shimadzu UV-2450 dual-beam spectrophotometer with a Shimadzu ISR-2200 integrating sphere. Measurement was made before and after bleaching of pigments with 400 µl of sodium hypochlorite (NaClO) solution with 1 % active chlorine for 10 minutes. Additional 20 minutes was used if the first bleaching was not complete. Filters were rinsed with artificial sea water (60 g Na2SO4 in 1 L of ultrapure water). As wet reference an average of 20 filters (filtered with ultrapure water throughout the campaign) was used. A baseline correction was done relative to the mean absorption values at 750–800 nm. Method used follows the method by Tassan and Ferrari 2002 (https://doi.org/10.1093/plankt/24.8.757). More sampling details in Kauko et al. 2017 (https://doi.org/10.1002/2016JG003626), Pavlov et al. 2017 (https://doi.org/10.1002/2016JC012471) and Kowalczuk et al. 2017 (https://doi.org/10.1002/2016JC012589).
Separate files for water column samples from ship CTD and on-ice CTD (mini-rosette), and for sea ice samples from different environments (thick second-year/first-year ice and young ice in a refrozen lead).
Variables include total particulate absorption (a_p), absorption by detritus (or non-algal particles; a_d), and algal (or pigment) absorption (a_phi). The latter is simply the difference between the total absorption (measured prior to bleaching) and absorption by detritus (measured after bleaching). Values are reported every two wavelengths (wl) from 242 nm to 800 nm (280 individual wavelengths).
Ice samples metadata included in the mat file contain:
- sample ID
- coring site (see the above mentioned papers for more details)
- ice floe number (floe) for thick ice (see the above mentioned papers for more details); for young ice only floe 3
- date_hour: year, month, day, hour (in UTC) OR date as one cell (in UTC)
- latitude (decimals)
- longitude (decimals)
- ice thickness (in cm)
- snow depth (in cm)
- sectionbottom: ice core section bottom distance (in cm) from ice-water interface
- sectiontop: ice core section top distance (in cm) from ice-water interface
- sectiontype (for young ice): ice core section type: 1=whole core, 2=bottom part, 3=top part
- chlorophyll a concentration (in mg/m3)
- total melted volume of the ice core section (in mL)
- field sampling comments (fieldcomment)
- laboratory analysis comment (labcomment) for thick ice
Water samples metadata include time, latitude, longitude and pressure (depth in meters).