Hydrographic and current time series data from outside the southern side of the Isfjorden Mouth during 8 September 2011 to 3 September 2012 at 78°03.637’ N; 013°31.271’ E, and 205 m depth. The mooring was deployed by the University Centre in Svalbard (UNIS) as a part of the AGF course “Polar Ocean Climate” to monitor inflow of Atlantic Water to Isfjorden, and was equipped with three Aanderaa Instruments recoding current meters (RCMs) with auxiliary CTD sensors covering the upper, the intermediate, and the bottom layer. Additionally, three SBE 37 MicroCAT CTDs and five VEMCO mini temperature loggers were evenly distributed over the water column. For further details of the mooring and data, see Skogseth et al. (2019).

Zooplankton dataset over the Kongsfjorden to Fram Strait marine biological transect collected in connection with Environmental monitoring of Svalbard and Jan Mayen (http://www.mosj.no/en/) programme. The dataset covers summers 1996-2016 except for 1998 when summer samples were not taken. The dataset contains only zooplankton collected with the MultiNet plankton sampler. The results published in Hop et al. 2019 (see the "Citation Custom" field) are based on this exact dataset. Norwegian Polar Institute"s database will contain extended data based on this dataset, and any users post-2019 are encouraged to use the extended dataset instead. The dataset is compiled in three files: **kf_zooplankton_abundance_data** contains zooplankton abundance data in *individuals per cubic meter*. The columns of the dataset consists of species and stage codes specified in the species metadata, while the rows consist of samples indicate in the sample metadata **kf_zooplankton_sampling_meta** contains row metadata for zooplankton abundance. Columns: id = row name in zooplankton abundance data; expedition = expedition/cruise name; station = standard station name across the MOSJ transect; sample_name = internal sample name for backwards compatibility; region = region category used in Hop et al. 2019; longitude = longitude as decimal degrees (WGS84); latitude = latitude as decimal degrees (WGS84); date = date in yyyy-mm-dd format; from = depth in meters where the MultiNet opened ; to = depth in meters where the MultiNet closed; comment = specific comments concerning the sample. **kf_zooplankton_species_meta** contains column metadata for zooplankton abundance. Columns: id = column name in zooplankton abundance data; species = scientific taxa name; stage = life stage; length = length group; origin = the assumed origin of species (Atlantic, Arctic, Both or Unknown); taxa = used for grouping of species data based on taxonomy in Hop et al. 2019; biomass_conv = abundance to biomass conversion factor, see Hop et al. 2019.

Hydrographic and current time series data from outside the southern side of the Isfjorden Mouth during 31 August 2014 to 24 August 2015 at 78°03.764’ N; 013°31.701’ E, and 211 m depth. The mooring was deployed by the University Centre in Svalbard (UNIS) as a part of the AGF course “Polar Ocean Climate” to monitor inflow of Atlantic Water to Isfjorden, and was equipped with three Aanderaa Instruments recoding current meters (RCMs) with auxiliary CTD sensors covering the upper, the intermediate, and the bottom layer. Additionally, three SBE 37 MicroCAT CTDs and four AUQAlogg temperature loggers were evenly distributed over the water column. For further details of the mooring and data, see Skogseth et al. (2019).

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

Under-ice spectral shorwave radiation with Trios RAMSES radiometers surface radiation transects.

The aim of the ECOgaps cruise was to improve our knowledgebase of the region's biological, chemical, and physical properties for the management of the King Haakon VII Sea from the coast of the Dronning Maud Land as part of CCAMLR's WSMPA Domain 4 planning. The focus of this cruise was on Astrid Ridge and Maud Rise. Work was divided into 7 packages: 1) Bird and marine mammal observations 2) Fish community 3) Benthic mapping 4) Zooplankton 5) Primary Production 6) Oceanography 7) Ocean Carbon chemistry. This is merely the preliminary cruise report with general impressions and initial observations and results.

Methane (CH4) flux from eddy covariance system