Salinity profiles of sea ice and snow on sea ice were measured in the Arctic Ocean during the Norwegian Young Sea Ice cruise in 2015 (https://www.npolar.no/en/projects/n-ice2015/), an international sea ice drift expedition led by the Norwegian Polar Institute. Salinity is a key parameter for a range of processes related to biology, photochemistry and physics of sea ice, snow on sea ice as well as atmospheric aerosol. Sea ice cores and snow samples were collected during the sea ice drift expedition from the ice floe and transferred to the ship''s laboratory. The aqueous conductivity of melted sea ice core and snow samples was measured and converted into practical salinity units. Funding was provided by the NERC grant NE/M005852/1, Japan Society for the Promotion of Science (15K16135, 24-4175) and the Centre of Ice, Climate and Ecosystems (ICE) at the Norwegian Polar Institute through the N-ICE project

Datasets from a shallow water mooring deployed in the Southern Ocean, north of South Georgia in November 2003 during the marine cruise JR92 and recovered in January 2004 by the marine cruise JR96.

Datasets from a deep sediment trap (3200m) mooring deployed in the Southern Ocean, south-west of South Georgia in December 2012 during the marine cruise JR280 and recovered in December 2013 by the marine cruise JR291.

Datasets from a deep sediment trap (3200m) mooring deployed in the Southern Ocean, south-west of South Georgia in December 2013 during the marine cruise JR291 and recovered in November 2014 by the marine cruise JR304.

Datasets from a deep water mooring deployed in the Southern Ocean, north of South Georgia in November 2003 during the marine cruise JR92 and recovered in January 2004 by the marine cruise JR96.

Datasets from a deep sediment trap (3700m) mooring deployed in the Southern Ocean, north-west of South Georgia in December 2009 during the marine cruise JR228 and recovered in November 2011 by the marine cruise JR260a.

Datasets from a deep sediment trap (3200m) mooring deployed in the Southern Ocean, south-west of South Georgia in December 2015 during the marine cruise JR15002 and recovered in December 2016 by the marine cruise JR16003.

Datasets from a deep water mooring deployed in the Southern Ocean, north of South Georgia in January 2004 during the marine cruise JR96 and recovered in March 2004 by the marine cruise JR100.

This dataset contains occurrence records for ten Southern Ocean myctophid fish species that have been downloaded and cleaned from the online biodiversity repository GBIF. As well as providing GBIF documented metadata for each occurrence record, this dataset provides environmental conditions - specifically bathymetry, temperature, salinity, dissolved oxygen and net primary productivity - for each record. Both sea-surface and depth-specific values for the temperature, salinity and oxygen variables are given in separate data files. A third data file of corresponding background points and their associated environmental conditions is also provided. Together these data were used as input files for the MaxEnt ecological niche models within the peer reviewed article: Freer JJ, Tarling GA, Collins MA, Partridge JC, Genner MJ (2020) Estimating circumpolar distributions of lanternfish using 2D and 3D ecological niche models, Marine Ecology Progress Series.

Datasets from a shallow water mooring deployed in the Southern Ocean, north of South Georgia in November 2004 during the marine cruise JR107 and recovered in January 2005 by the marine cruise JR116.