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.
Sea ice protist diversity from the Arctic Ocean over nearly 40 years. The data is given as percentage of total including the following metadata: expedition, station, core id, gear, old-unit, longitude, latitude, date, ice type, snow, ice, core type, section, core length (cm), section (cm), year, month, sun angel, daylength, PAR
Quality
The data sources originated from Arctic and Antarctic Research Institute (AARI), Alfred Wegener Institute Helmholtz Center for Polar and Marine Research (AWI) and Norwegian Polar Institute (NPI) and the processing of the samples vary slightly between the three different institutions. The different procedures are decribed in Hop et al. 2021. In all sample sea-ice protists were identified to the lowest possible taxonomic rank under inverted light microscope. The taxonomic nomenclature has changed considerably within the four decades of data coverage in this study therefore taxa name reported in the original datasets were corrected, updated and unified using a three-step protocol. First, all reported taxa names were passed through the World Register of Marine Species database (WoRMS Editorial Board, 2018) to confirm the validity of a name using the taxize package (Chamberlain and Szöcs, 2013) for 263 R (R Core Team, 2018). Second, the returned taxon names were then validated by protist taxonomy experts within the author team, and when needed, checked against the AlgaeBase database (http://www.algaebase.org/), which represents more up-to-date classification of protist taxa than WoRM, but is not programmatically available due to copyright restrictions. Finally, the taxon names were manually edited to make the taxonomic ranks across datasets as comparable as possible. Since the taxonomic ranks are not consistent within the compiled dataset, we use the term “taxa” when referring to all sea-ice protists and the term “species” when referring to species level or lower.