IMBIE Team (led from Northumbria University); archived by the NERC EDS UK Polar Data Centre

Mass balance of the Greenland and Antarctic ice sheets from the 1970s to 2023 (IMBIE 2026)

Reconciled estimates of ice sheet mass change from 45 independent satellite surveys (altimetry, gravimetry and the input-output method): monthly rate of mass change (Gt per year), cumulative mass anomaly (Gt) and its split into surface mass balance and ice dynamics, each with a one-sigma uncertainty, for Greenland (July 1971 to December 2023) and for Antarctica as a whole, West and East Antarctica and the Antarctic Peninsula (January 1979 to December 2023). A parallel set of files gives the same in millimetres of sea level equivalent, signed as mass balance (negative means sea level rise). Ends in December 2023; anything later would come from another source, shown separately.

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Licence and credit

Licence: Open Government Licence v3.0
What the terms say: “Access Constraints: No restrictions apply. Use Constraints: Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.”
From the producer's terms, checked 2026-10-04; re-checked automatically every week.
Credit we give: IMBIE: Otosaka et al. (2026), Mass balance of the Greenland and Antarctic Ice Sheets from the 1970s to 2023 (Version 1.0), NERC EDS UK Polar Data Centre, doi:10.5285/128c5e33-5224-4197-82f0-19dcc95b80a0; Otosaka et al. (2026), Scientific Data 13, 1301, doi:10.1038/s41597-026-08088-0. Contains public sector information licensed under the Open Government Licence v3.0.
Copy of the raw file: Allowed: we keep a public copy of every version we use.
Cite as: Otosaka, I., Shepherd, A., Amory, C., Horwath, M., King, M., Nowicki, S., Payne, A., Rignot, E., Sørensen, L., Schlegel, N., Simon, K., Smith, B., Sutterley, T., van den Broeke, M., Velicogna, I., A, G., Agosta, C., Ditmar, P., Döhne, T., … Wouters, B. (2026). Mass balance of the Greenland and Antarctic Ice Sheets from the 1970s to 2023 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/128c5e33-5224-4197-82f0-19dcc95b80a0

Files

Greenland Ice Sheet, July 1971 to December 2023: monthly mass balance (Gt/yr), cumulative mass anomaly (Gt), and their surface mass balance and ice dynamics parts, each with a 1-sigma uncertainty. CF-style '#' header (101,046 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_greenland_Gt_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19ncmVlbmxhbmRfR3RfcGFydGl0aW9uZWQuY3N2
Greenland Ice Sheet, July 1971 to December 2023: the same quantities in millimetres of sea level equivalent, with the mass-balance sign (negative = sea level rise). CF-style '#' header (104,333 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_greenland_mm_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19ncmVlbmxhbmRfbW1fcGFydGl0aW9uZWQuY3N2
Antarctic Ice Sheet (whole), January 1979 to December 2023: monthly mass balance (Gt/yr), cumulative mass anomaly (Gt), and their surface mass balance and ice dynamics parts, each with a 1-sigma uncertainty. CF-style '#' header (83,257 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_antarctica_Gt_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19hbnRhcmN0aWNhX0d0X3BhcnRpdGlvbmVkLmNzdg%3D%3D
Antarctic Ice Sheet (whole), January 1979 to December 2023: the same quantities in millimetres of sea level equivalent, with the mass-balance sign (negative = sea level rise). CF-style '#' header (89,834 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_antarctica_mm_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19hbnRhcmN0aWNhX21tX3BhcnRpdGlvbmVkLmNzdg%3D%3D
West Antarctic Ice Sheet, January 1979 to December 2023: monthly mass balance (Gt/yr), cumulative mass anomaly (Gt), and their surface mass balance and ice dynamics parts, each with a 1-sigma uncertainty. CF-style '#' header (82,665 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_west_antarctica_Gt_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM193ZXN0X2FudGFyY3RpY2FfR3RfcGFydGl0aW9uZWQuY3N2
West Antarctic Ice Sheet, January 1979 to December 2023: the same quantities in millimetres of sea level equivalent, with the mass-balance sign (negative = sea level rise). CF-style '#' header (89,875 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_west_antarctica_mm_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM193ZXN0X2FudGFyY3RpY2FfbW1fcGFydGl0aW9uZWQuY3N2
East Antarctic Ice Sheet, January 1979 to December 2023: monthly mass balance (Gt/yr), cumulative mass anomaly (Gt), and their surface mass balance and ice dynamics parts, each with a 1-sigma uncertainty. CF-style '#' header (81,531 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_east_antarctica_Gt_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19lYXN0X2FudGFyY3RpY2FfR3RfcGFydGl0aW9uZWQuY3N2
East Antarctic Ice Sheet, January 1979 to December 2023: the same quantities in millimetres of sea level equivalent, with the mass-balance sign (negative = sea level rise). CF-style '#' header (88,966 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_east_antarctica_mm_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19lYXN0X2FudGFyY3RpY2FfbW1fcGFydGl0aW9uZWQuY3N2
Antarctic Peninsula, January 1979 to December 2023: monthly mass balance (Gt/yr), cumulative mass anomaly (Gt), and their surface mass balance and ice dynamics parts, each with a 1-sigma uncertainty. CF-style '#' header (82,196 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_antarctic_peninsula_Gt_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19hbnRhcmN0aWNfcGVuaW5zdWxhX0d0X3BhcnRpdGlvbmVkLmNzdg%3D%3D
Antarctic Peninsula, January 1979 to December 2023: the same quantities in millimetres of sea level equivalent, with the mass-balance sign (negative = sea level rise). CF-style '#' header (90,021 bytes).
https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_antarctic_peninsula_mm_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19hbnRhcmN0aWNfcGVuaW5zdWxhX21tX3BhcnRpdGlvbmVkLmNzdg%3D%3D

Status

Programme: Complete (the Polar Data Centre record says "Dataset Progress: Complete"): version 1.0, files of 6 July 2026, data to December 2023. A later IMBIE assessment would be a new dataset with its own DOI. Funded by ESA and NASA, led from Northumbria University and archived in the UK.
Updates: Static (IMBIE assessments are irregular, several years apart)
Last check: Unchanged since the last fetch (2026-10-05T11:03:29Z)