{
  "attribution": "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.",
  "description": "Cumulative change in the mass of the Antarctic Ice Sheet each month from January 1979 to December 2023, from the IMBIE team's reconciliation of satellite surveys, with the one-sigma uncertainty. Negative values are a loss of ice.",
  "dimensions": [],
  "display": {
    "decimals": 0
  },
  "geo_coverage": "global-only",
  "headline_entity": "ATA",
  "id": "ice-sheet-mass.imbie-2026.antarctica",
  "kind": "series",
  "latest": {
    "age_bp": null,
    "dims": {},
    "entity": "ATA",
    "period": "2023-12",
    "status": "final",
    "value": -4779.472
  },
  "licence": {
    "name": "Open Government Licence v3.0",
    "spdx": "OGL-UK-3.0",
    "url": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/"
  },
  "licence_class": "open",
  "notes": [],
  "notice": null,
  "origins": [
    {"acquisition": "automatic", "artifact_id": "antarctica-gt", "bytes": 83257, "citation_full": "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", "date_accessed": "2026-10-05", "date_published": "2026-07-06", "doi": "10.5285/128c5e33-5224-4197-82f0-19dcc95b80a0", "etag": null, "last_modified": "Mon, 06 Jul 2026 10:07:40 GMT", "licence": {"name": "Open Government Licence v3.0", "spdx": "OGL-UK-3.0", "url": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/"}, "producer": "IMBIE Team (led from Northumbria University); archived by the NERC EDS UK Polar Data Centre", "r2_url": "https://files.environmentdashboard.org/raw/cdb5f37c703af3fb36ccbf89f6ca0ba8b444817cb48ff34cc77ca7a9d9a525b2.zst", "sha256": "cdb5f37c703af3fb36ccbf89f6ca0ba8b444817cb48ff34cc77ca7a9d9a525b2", "source_id": "imbie-2026", "title": "Mass balance of the Greenland and Antarctic ice sheets from the 1970s to 2023 (IMBIE 2026)", "url_download": "https://ramadda.data.bas.ac.uk/repository/entry/get/imbie3_antarctica_Gt_partitioned.csv?entryid=synth%3A128c5e33-5224-4197-82f0-19dcc95b80a0%3AL2ltYmllM19hbnRhcmN0aWNhX0d0X3BhcnRpdGlvbmVkLmNzdg%3D%3D", "url_main": "https://data.bas.ac.uk/full-record.php?id=GB/NERC/BAS/PDC/02074", "version_producer": "1.0", "wayback_url": null}
  ],
  "processing": [
    {
      "description": "Read the 'Cumulative mass balance anomaly (Gt)' column of imbie3_antarctica_Gt_partitioned.csv (IMBIE version 1.0), 1979-01 to 2023-12, as printed.",
      "inputs": ["cdb5f37c703af3fb36ccbf89f6ca0ba8b444817cb48ff34cc77ca7a9d9a525b2"],
      "lock_sha256": "7e110986c30381965c2e6096466c401cbf72bd1b7a828369f6f6c14c909dcbda",
      "script": "pipeline/src/envdash/transforms/ice/imbie_2026.py",
      "transform_sha256": "890ecd9e82cc65eb0035bf87823c2a8ed59f083ca51502ecc722709a13032788"
    },
    {
      "description": "Lower and upper are the value minus and plus the file's 'Cumulative mass balance anomaly uncertainty (Gt)', which the file states is one standard deviation (exact decimal arithmetic).",
      "inputs": ["cdb5f37c703af3fb36ccbf89f6ca0ba8b444817cb48ff34cc77ca7a9d9a525b2"],
      "lock_sha256": "7e110986c30381965c2e6096466c401cbf72bd1b7a828369f6f6c14c909dcbda",
      "script": "pipeline/src/envdash/transforms/ice/imbie_2026.py",
      "transform_sha256": "890ecd9e82cc65eb0035bf87823c2a8ed59f083ca51502ecc722709a13032788"
    }
  ],
  "published_value": null,
  "schema_version": 1,
  "scope": {
    "baseline": "Zero just before January 1979, the start of IMBIE's Antarctic record; the first month's value is that month's change.",
    "basis": "Reconciled from 21 independent satellite estimates (altimetry, gravimetry and the input-output method) by IMBIE 2026; total mass balance, the sum of surface mass balance and ice dynamics.",
    "bunkers": null,
    "geography": "Antarctic Ice Sheet (West and East Antarctica and the Antarctic Peninsula)",
    "gwp": null,
    "lulucf": null
  },
  "superseded_by": null,
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  },
  "time_basis": "calendar",
  "title": "Antarctic Ice Sheet mass change since January 1979 (IMBIE)",
  "unit": {
    "code": "Gt",
    "label": "gigatonnes",
    "short": "Gt"
  },
  "vintage": "1.0"
}