The weights of fledging Gentoo penguin chicks at Bird Island have been monitored since 1989. The colony at Johnson Cove can have over 1000 breeding pairs. Each year, just before their departure from the colony, a sample of 100 fledgling birds are weighed as part of the Bird Island long-term monitoring programme. This data is submitted to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) as part of their Ecosystem Monitoring Programme (CEMP). This work was funded by Natural Environment Research Council (UK) core funding to the British Antarctic Survey.

The weights of fledging Gentoo penguin chicks at Maiviken have been monitored since 2010. The colony at Maiviken, can have over 1000 breeding pairs. Each year, just before their departure from the colony, a sample of 50 fledgling birds are weighed as part of a long-term monitoring programme. These data are submitted to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) as part of their Ecosystem Monitoring Programme (CEMP). This work was funded by Natural Environment Research Council (UK) core funding to the British Antarctic Survey.

This dataset contains floe-scale fragmentation data derived from high-resolution satellite imagery from the USGS Global Fiducials Library. Individual sea ice floes were identified and tracked before and after fragmentation to study the fragmentation processes. The dataset includes floe-scale images, segmentation masks, and floe parameters. It can be used to investigate the fragmentation of Arctic sea ice during the spring breakup and summer melt seasons. The dataset was produced by the University of Huddersfield team. NERC standard grant NE/V011693/1.

This dataset contains four types of data: i) IceNet''s 93-day pan-Arctic sea ice concentration forecasts, initialised each day between 26th July - 12th December for the years 2020-2022 inclusive (140 forecasts per year), ii) neural network weights for the IceNet model used to generate the forecasts, iii) a Shapefile for the coastline of Victoria Island (Nunavut, Canada), which was used to estimate caribou sea ice crossing-start times, and iv) CSV files with results linking sea ice concentration values to caribou sea ice crossing-start times. This data was used to explore if and how sea ice forecasts from the IceNet model could give early-warning of Dolphin and Union caribou migration times from Victoria Island to the mainland, by predicting key sea ice concentration thresholds. This work was supported under the WWF-UK Arctic IceNet grant (project number GB085600), the EPSRC Grant EP/Y028880/1 and the Environment and Sustainability Grand Challenge at the Alan Turing Institute.

Seawater samples between 2010-12-28 and 2020-02-28 were collected year-round and quasi-weekly in Ryder Bay, along the West Antarctic Peninsula, as part of the Rothera Oceanographic Time Series (RaTS). The majority of samples were collected at 15 m depth. At a lower frequency, samples were collected at additional depths, i.e., mostly at 40 m, 5, m, and 2 m. Samples have been analysed for dissolved inorganic carbon (DIC) and total alkalinity (TA) to study the carbonate chemistry of the upper ocean, from which the fugacity of CO2 (fCO2) is derived. This dataset also includes additional variables of the RaTS-array that are ancillary to DIC and TA results, and to fCO2 calculations: seawater temperature, salinity, and nutrients (nitrate, silicate, and phosphate). DIC/TA data between 2010-12-28 and 2014-02-21 have previously been published in NCEI by Bakker et al. (2017), and are included in this dataset. Physical variables and nutrient data have also been published in the UK Polar Data Centre by Clarke et al. (2022). Funding Sources: Funding sources for Rothera Time Series 2014-2020: - The Rothera Time Series has been funded by NERC through a sequence of National Capability awards, most recently PRESCIENT (NE/Y006178/1). - ESD: NE/L002582/1 and European Union''s Horizon 2020 research and innovation programme under grant agreement no. 821001 - DCEB: partly supported by the NERC PICCOLO award (NE/PO21395/1). - EJ: research programme 866.13.006 (partly) financed by the Netherlands Polar Programme at NWO. - MPM: partly funded by BIOPOLE award (NE/W004933/1). Funding sources for Rothera Time Series 2010-2014: - British Antarctic Survey (BAS) Polar Oceans funding from NERC - UK Ocean Acidification Research Programme (NE/H017046/1) funded by NERC, the Department for Energy and Climate Change and the Department for Environment, Food and Rural Affairs - OJL: PhD funding from NERC: NE/L50158X/1 - DCEB: NERC Shelf Sea Biogeochemistry Blue Carbon work package (NE/K00168X/1)

Aeromagnetic data provides important constraints on the sub-surface geology of a region. This dataset contains aeromagnetic line data collected by the British Antarctic Survey during the second aerogeophysical survey carried out as part of the International Thwaites Glacier Collaboration (ITGC). Data were collected using a caesium magnetometer system, and have been corrected to total field values following the approach laid out by the SCAR ADMAP working group (https://www.scar.org/science/admap/about/). In total 8688 km of data is presented, of this ~6052 km was collected in the main survey area, while other data was collected on input transit flights. The aircraft used was the BAS aerogeophysicaly equipped twin otter VP-FBL. Data are available as an ASCII table (.csv). The Thwaites 2019/20 aerogeophysical survey was carried out as part of the BAS National Capability contribution to the NERC/NSF International Thwaites Glacier Collaboration (ITGC) program. Data processing was supported by the BAS Geology and Geophysics team.

As part of the International Thwaites Glacier Collaboration (ITGC) ~4432 km of new radar depth sounding data was acquired over the Thwaites Glacier catchment by the British Antarctic Survey. Data was collected using the PASIN-2 polametric radar system, fitted on the BAS aerogeophysical equipped survey aircraft "VP-FBL". The survey operated from Lower Thwaites Glacier camp, and focused on collecting data in regions of ice >1.5 km thick between 70 and 180 km from the grounding line. Additional profiles from the coast to the Western Antarctic Ice Sheet (WAIS) divide and over the eastern shear margin were also flown. Ice thicknesses between 418 and 3744 m were measured, with a minimum bed elevation of -2282 m imaged. Our Twin Otter aircraft was equipped with dual-frequency carrier-phase GPS for navigation, radar altimeter for surface mapping, wing-tip magnetometers, an iMAR strapdown gravity system, and a new ice-sounding radar system (PASIN-2). We present here the full radar dataset consisting of the deep-sounding chirp and shallow-sounding pulse-acquired data in their processed form, as well as the navigational information of each trace, the surface and bed elevation picks, ice thickness, and calculated absolute surface and bed elevations. This dataset comes primarily in the form of NetCDF and georeferenced SEGY files. To interactively engage with this newly-published dataset, we also created segmented quicklook PDF files of the radar data.

A new version of this dataset exists. To see the last version of the Antarctic Digital Database, have a look here: https://data.bas.ac.uk/collections/e74543c0-4c4e-4b41-aa33-5bb2f67df389/ Coastline for Antarctica created from various mapping and remote sensing sources, provided as polygons with ''land'', ''ice shelf'', ''ice tongue'' or ''rumple'''' attribute. Covering all land and ice shelves south of 60S. Suitable for topographic mapping and analysis. Data compiled, managed and distributed by the Mapping and Geographic Information Centre and the UK Polar Data Centre, British Antarctic Survey on behalf of the Scientific Committee on Antarctic Research. Major changes in v7.4 include updates to coastline and ice shelves between Gipps Ice Rise and Ronne Ice Shelf, updated ice shelf fronts for Brunt, Stange and West ice shelves, Pine Island Glacier, and an updated coastline for Adelaide Island.

A new version of this dataset exists. To see the last version of the Antarctic Digital Database, have a look here: https://data.bas.ac.uk/collections/e74543c0-4c4e-4b41-aa33-5bb2f67df389/ A medium resolution seamask for regions south of 60S, comprised of a roundel polygon with all land and ice shelves erased.

A new version of this dataset exists. To see the last version of the Antarctic Digital Database, have a look here: https://data.bas.ac.uk/collections/e74543c0-4c4e-4b41-aa33-5bb2f67df389/ Coastline for Antarctica created from various mapping and remote sensing sources, provided as polygons with ''land'', ''ice shelf'', ''ice tongue'' or ''rumple'''' attribute. This dataset has been generalised from the high resolution vector polygons. Covering all land and ice shelves south of 60S. Suitable for topographic mapping and analysis. Data compiled, managed and distributed by the Mapping and Geographic Information Centre and the UK Polar Data Centre, British Antarctic Survey on behalf of the Scientific Committee on Antarctic Research. Major changes in v7.4 include updates to coastline and ice shelves between Gipps Ice Rise and Ronne Ice Shelf, updated ice shelf fronts for Brunt, Stange and West ice shelves, Pine Island Glacier, and an updated coastline for Adelaide Island.