Seasonal sea ice concentration at Signy Island, South Orkney Islands, 1982-2024

This dataset comprises covariables describing the seasonal sea ice cycle around Signy Island, South Orkney Islands between 1982 and 2024. The data are derived from satellite images using R-scripts which have been made available on Zenodo. Sea ice concentration was derived from satellite measurements of percent sea ice concentration. The satellite sea ice concentration data are modelled to provide derived covariates that together measure inter-annual differences in the sea ice season. The derived covariates are: 1) day of advance: first day when sea ice concentration exceeded 15% for at least five consecutive days; 2) day of retreat: first day when sea ice concentration remained less than 15% until the end of period; 3) ice season duration: total number of sea-ice days, between day of advance and retreat; 4) sea-ice persistence: percent time sea ice was present between day of advance and retreat; 5) day of minimum sea ice extent; 6) day of maximum extent; 7) day of minimum sea ice area; 8) day of maximum sea ice area; 9) minimum area of the ocean in km2 with at least 15% sea ice concentration; and 10) maximum area of the ocean with at least 15% sea ice concentration. Sea ice covariates are used as predictors of population dynamics of Antarctic seals at Signy Island, South Orkney Islands.

This work was funded by Natural Environment Research Council (UK) core funding to the British Antarctic Survey.

Alternate title: Polar Data Centre (PDC) record GB/NERC/BAS/PDC/02065

Date (Publication): 2025-05-29

Citation identifier: http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/02065

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey		pdc@bas.ac.uk	Custodian
NERC EDS UK Polar Data Centre	Forcada, J., Dunn, M., & Waluda, C.	pdc@bas.ac.uk	Originator

Maintenance and update frequency: Unknown

Keywords

NDGO0001

NERC OAI Harvesting

NERC_DDC

GCMD Parameter Valids

EARTH SCIENCE > Cryosphere > Sea Ice > Ice Extent

BAS Free-text keywords

Advance
Ice days
Persistence
Retreat
Sea-ice concentration
Sea-ice cycle

Use limitation: This data is governed by the NERC data policy ( http://www.nerc.ac.uk/research/sites/data/policy/) and supplied under Open Government Licence v.3 ( http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).

Access constraints: Other restrictions

Other constraints: This data is governed by the NERC data policy ( http://www.nerc.ac.uk/research/sites/data/policy/) and supplied under Open Government Licence v.3 ( http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).

Language: English

Topic category

Environment

Begin date: 1982-01-01

End date: 2024-03-31

Reference system identifier: OGP / urn:ogc:def:crs:EPSG::4326

Distribution format

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
Polar Data Centre - British Antarctic Survey		pdc@bas.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
http	http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=0283c3e4-2164-4dfb-a066-0c49b816d7b6	GET DATA

Hierarchy level: Dataset

Domain consistency

Measure identification: INSPIRE / Conformity_001

Conformance result

Title: INSPIRE Data Specification on unknown theme Guidelines

Date

Explanation: See the referenced specification

Pass: No

Statement: Data quality control is guaranteed by the satellite data providers, NOAA/NESDIS/NCEI; and the quality of the derived covariates used in the analysis responds to the peer review process of the associated manuscript, where the data was used. For further quality control purposes, the code used to download the raw data and analysis can be found at: www.doi.org/10.5281/zenodo.15544181.