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Sea level rise from the Antarctic Ice Sheet since January 1979 (IMBIE)

How much the Antarctic Ice Sheet's loss of ice has added to global mean sea level each month from January 1979 to December 2023, from the IMBIE team's reconciliation of satellite surveys, with the one-sigma uncertainty. IMBIE converts 360 Gt of ice to 1 mm of sea level.

Latest value

13.3mm

Antarctic Ice Sheet (West and East Antarctica and the Antarctic Peninsula), December 2023. Version 1.0.

Sea level rise from the Antarctic Ice Sheet since January 1979 (IMBIE) (millimetres)

540 values from January 1979 to December 2023. The shaded band is the uncertainty range the producer gives.
Show as a table
Sea level rise from the Antarctic Ice Sheet since January 1979 (IMBIE), every value
PeriodValue (mm)RangeStatus
1979-010.0−0.1 to 0.1final
1979-020.0−0.1 to 0.1final
1979-030.0−0.1 to 0.2final
1979-040.1−0.1 to 0.2final
1979-050.1−0.1 to 0.2final
1979-060.1−0.1 to 0.3final
1979-070.1−0.1 to 0.3final
1979-080.1−0.1 to 0.3final
1979-090.1−0.1 to 0.4final
1979-100.1−0.1 to 0.4final
1979-110.1−0.1 to 0.4final
1979-120.2−0.1 to 0.4final
1980-010.2−0.1 to 0.4final
1980-020.2−0.1 to 0.4final
1980-030.2−0.1 to 0.4final
1980-040.2−0.1 to 0.5final
1980-050.2−0.1 to 0.5final
1980-060.2−0.1 to 0.5final
1980-070.2−0.1 to 0.5final
1980-080.2−0.1 to 0.5final
1980-090.2−0.1 to 0.5final
1980-100.2−0.1 to 0.5final
1980-110.2−0.1 to 0.5final
1980-120.2−0.1 to 0.5final
1981-010.2−0.1 to 0.5final
1981-020.2−0.1 to 0.5final
1981-030.2−0.1 to 0.5final
1981-040.2−0.1 to 0.5final
1981-050.2−0.1 to 0.5final
1981-060.2−0.1 to 0.5final
1981-070.2−0.1 to 0.5final
1981-080.2−0.1 to 0.5final
1981-090.2−0.1 to 0.5final
1981-100.2−0.1 to 0.5final
1981-110.2−0.1 to 0.5final
1981-120.2−0.1 to 0.5final
1982-010.2−0.1 to 0.5final
1982-020.2−0.1 to 0.6final
1982-030.2−0.1 to 0.6final
1982-040.2−0.1 to 0.6final
1982-050.2−0.1 to 0.6final
1982-060.2−0.1 to 0.6final
1982-070.3−0.1 to 0.6final
1982-080.3−0.1 to 0.6final
1982-090.3−0.1 to 0.6final
1982-100.3−0.1 to 0.6final
1982-110.3−0.1 to 0.6final
1982-120.3−0.1 to 0.6final
1983-010.3−0.1 to 0.6final
1983-020.3−0.1 to 0.6final
1983-030.3−0.1 to 0.6final
1983-040.3−0.1 to 0.6final
1983-050.3−0.1 to 0.6final
1983-060.30.0 to 0.7final
1983-070.30.0 to 0.7final
1983-080.30.0 to 0.7final
1983-090.30.0 to 0.7final
1983-100.30.0 to 0.7final
1983-110.30.0 to 0.7final
1983-120.30.0 to 0.7final
1984-010.30.0 to 0.7final
1984-020.30.0 to 0.7final
1984-030.30.0 to 0.7final
1984-040.3−0.1 to 0.7final
1984-050.3−0.1 to 0.7final
1984-060.3−0.1 to 0.7final
1984-070.3−0.1 to 0.7final
1984-080.3−0.1 to 0.7final
1984-090.3−0.1 to 0.7final
1984-100.3−0.1 to 0.7final
1984-110.3−0.1 to 0.7final
1984-120.3−0.1 to 0.7final
1985-010.3−0.1 to 0.7final
1985-020.3−0.1 to 0.7final
1985-030.3−0.1 to 0.7final
1985-040.3−0.1 to 0.7final
1985-050.3−0.1 to 0.7final
1985-060.3−0.1 to 0.7final
1985-070.3−0.1 to 0.7final
1985-080.3−0.1 to 0.7final
1985-090.3−0.1 to 0.7final
1985-100.3−0.1 to 0.7final
1985-110.3−0.1 to 0.7final
1985-120.3−0.1 to 0.7final
1986-010.3−0.1 to 0.7final
1986-020.3−0.1 to 0.7final
1986-030.3−0.1 to 0.7final
1986-040.3−0.1 to 0.7final
1986-050.3−0.1 to 0.7final
1986-060.4−0.1 to 0.8final
1986-070.40.0 to 0.8final
1986-080.40.0 to 0.8final
1986-090.40.0 to 0.8final
1986-100.40.0 to 0.8final
1986-110.40.0 to 0.8final
1986-120.40.0 to 0.8final
1987-010.50.1 to 0.9final
1987-020.50.1 to 0.9final
1987-030.50.1 to 0.9final
1987-040.60.1 to 1.0final
1987-050.60.2 to 1.0final
1987-060.60.2 to 1.0final
1987-070.60.2 to 1.1final
1987-080.70.3 to 1.1final
1987-090.70.3 to 1.1final
1987-100.70.3 to 1.2final
1987-110.80.3 to 1.2final
1987-120.80.4 to 1.2final
1988-010.80.4 to 1.2final
1988-020.90.4 to 1.3final
1988-030.90.5 to 1.3final
1988-040.90.5 to 1.3final
1988-050.90.5 to 1.4final
1988-061.00.5 to 1.4final
1988-071.00.6 to 1.4final
1988-081.00.6 to 1.5final
1988-091.10.6 to 1.5final
1988-101.10.7 to 1.5final
1988-111.10.7 to 1.6final
1988-121.20.7 to 1.6final
1989-011.20.8 to 1.6final
1989-021.20.8 to 1.7final
1989-031.20.8 to 1.7final
1989-041.30.8 to 1.7final
1989-051.30.9 to 1.7final
1989-061.30.9 to 1.8final
1989-071.40.9 to 1.8final
1989-081.40.9 to 1.8final
1989-091.41.0 to 1.9final
1989-101.41.0 to 1.9final
1989-111.51.0 to 1.9final
1989-121.51.0 to 1.9final
1990-011.51.0 to 2.0final
1990-021.51.1 to 2.0final
1990-031.51.1 to 2.0final
1990-041.61.1 to 2.0final
1990-051.61.1 to 2.0final
1990-061.61.1 to 2.1final
1990-071.61.1 to 2.1final
1990-081.61.2 to 2.1final
1990-091.61.2 to 2.1final
1990-101.71.2 to 2.1final
1990-111.71.2 to 2.1final
1990-121.71.2 to 2.2final
1991-011.71.2 to 2.2final
1991-021.71.2 to 2.2final
1991-031.71.2 to 2.2final
1991-041.71.2 to 2.2final
1991-051.71.2 to 2.2final
1991-061.71.2 to 2.2final
1991-071.71.2 to 2.2final
1991-081.71.2 to 2.2final
1991-091.71.2 to 2.2final
1991-101.71.2 to 2.2final
1991-111.71.2 to 2.2final
1991-121.71.2 to 2.2final
1992-011.71.2 to 2.2final
1992-021.71.2 to 2.2final
1992-031.71.2 to 2.2final
1992-041.71.2 to 2.2final
1992-051.71.1 to 2.2final
1992-061.61.1 to 2.2final
1992-071.61.1 to 2.1final
1992-081.61.1 to 2.1final
1992-091.61.0 to 2.1final
1992-101.61.0 to 2.1final
1992-111.61.0 to 2.1final
1992-121.51.0 to 2.1final
1993-011.51.0 to 2.1final
1993-021.51.0 to 2.1final
1993-031.51.0 to 2.1final
1993-041.51.0 to 2.1final
1993-051.51.0 to 2.1final
1993-061.51.0 to 2.1final
1993-071.61.0 to 2.1final
1993-081.61.0 to 2.1final
1993-091.61.0 to 2.1final
1993-101.61.0 to 2.2final
1993-111.61.0 to 2.2final
1993-121.61.0 to 2.2final
1994-011.61.0 to 2.2final
1994-021.61.0 to 2.2final
1994-031.61.0 to 2.2final
1994-041.71.1 to 2.3final
1994-051.71.1 to 2.3final
1994-061.71.1 to 2.3final
1994-071.71.1 to 2.4final
1994-081.81.2 to 2.4final
1994-091.81.2 to 2.4final
1994-101.81.2 to 2.4final
1994-111.91.2 to 2.5final
1994-121.91.3 to 2.5final
1995-011.91.3 to 2.5final
1995-021.91.3 to 2.6final
1995-032.01.3 to 2.6final
1995-042.01.4 to 2.6final
1995-052.01.4 to 2.6final
1995-062.01.4 to 2.7final
1995-072.11.4 to 2.7final
1995-082.11.5 to 2.7final
1995-092.11.5 to 2.7final
1995-102.11.5 to 2.8final
1995-112.21.5 to 2.8final
1995-122.21.5 to 2.8final
1996-012.21.6 to 2.8final
1996-022.21.6 to 2.9final
1996-032.21.6 to 2.9final
1996-042.31.6 to 2.9final
1996-052.31.6 to 2.9final
1996-062.31.7 to 3.0final
1996-072.31.7 to 3.0final
1996-082.31.7 to 3.0final
1996-092.41.7 to 3.0final
1996-102.41.7 to 3.0final
1996-112.41.8 to 3.1final
1996-122.41.8 to 3.1final
1997-012.51.8 to 3.1final
1997-022.51.8 to 3.1final
1997-032.51.8 to 3.2final
1997-042.51.8 to 3.2final
1997-052.51.8 to 3.2final
1997-062.51.9 to 3.2final
1997-072.61.9 to 3.2final
1997-082.61.9 to 3.3final
1997-092.61.9 to 3.3final
1997-102.61.9 to 3.3final
1997-112.61.9 to 3.3final
1997-122.61.9 to 3.3final
1998-012.72.0 to 3.4final
1998-022.72.0 to 3.4final
1998-032.72.0 to 3.4final
1998-042.72.0 to 3.4final
1998-052.82.0 to 3.5final
1998-062.82.1 to 3.5final
1998-072.82.1 to 3.5final
1998-082.82.1 to 3.5final
1998-092.82.1 to 3.6final
1998-102.92.1 to 3.6final
1998-112.92.2 to 3.6final
1998-122.92.2 to 3.6final
1999-012.92.2 to 3.7final
1999-023.02.2 to 3.7final
1999-033.02.3 to 3.7final
1999-043.02.3 to 3.7final
1999-053.02.3 to 3.8final
1999-063.12.3 to 3.8final
1999-073.12.4 to 3.8final
1999-083.12.4 to 3.9final
1999-093.22.4 to 3.9final
1999-103.22.4 to 3.9final
1999-113.22.5 to 4.0final
1999-123.22.5 to 4.0final
2000-013.32.5 to 4.0final
2000-023.32.6 to 4.0final
2000-033.32.6 to 4.1final
2000-043.42.6 to 4.1final
2000-053.42.6 to 4.1final
2000-063.42.7 to 4.2final
2000-073.52.7 to 4.2final
2000-083.52.7 to 4.2final
2000-093.52.8 to 4.3final
2000-103.52.8 to 4.3final
2000-113.62.8 to 4.3final
2000-123.62.8 to 4.4final
2001-013.62.9 to 4.4final
2001-023.62.9 to 4.4final
2001-033.72.9 to 4.4final
2001-043.72.9 to 4.5final
2001-053.72.9 to 4.5final
2001-063.73.0 to 4.5final
2001-073.73.0 to 4.5final
2001-083.83.0 to 4.5final
2001-093.83.0 to 4.6final
2001-103.83.0 to 4.6final
2001-113.83.1 to 4.6final
2001-123.93.1 to 4.6final
2002-013.93.1 to 4.7final
2002-023.93.1 to 4.7final
2002-033.93.1 to 4.7final
2002-043.93.2 to 4.7final
2002-054.03.2 to 4.8final
2002-064.03.2 to 4.8final
2002-074.03.2 to 4.8final
2002-084.03.2 to 4.8final
2002-094.13.3 to 4.9final
2002-104.13.3 to 4.9final
2002-114.13.3 to 4.9final
2002-124.13.3 to 4.9final
2003-014.23.3 to 5.0final
2003-024.23.4 to 5.0final
2003-034.23.4 to 5.0final
2003-044.33.4 to 5.1final
2003-054.33.5 to 5.1final
2003-064.33.5 to 5.1final
2003-074.43.5 to 5.2final
2003-084.43.6 to 5.2final
2003-094.43.6 to 5.2final
2003-104.53.6 to 5.3final
2003-114.53.7 to 5.3final
2003-124.53.7 to 5.3final
2004-014.53.7 to 5.4final
2004-024.63.7 to 5.4final
2004-034.63.8 to 5.4final
2004-044.63.8 to 5.4final
2004-054.63.8 to 5.5final
2004-064.73.8 to 5.5final
2004-074.73.8 to 5.5final
2004-084.73.9 to 5.5final
2004-094.73.9 to 5.6final
2004-104.73.9 to 5.6final
2004-114.83.9 to 5.6final
2004-124.83.9 to 5.6final
2005-014.84.0 to 5.6final
2005-024.84.0 to 5.7final
2005-034.84.0 to 5.7final
2005-044.84.0 to 5.7final
2005-054.84.0 to 5.7final
2005-064.94.0 to 5.7final
2005-074.94.0 to 5.7final
2005-084.94.0 to 5.7final
2005-094.94.0 to 5.7final
2005-104.94.0 to 5.8final
2005-114.94.0 to 5.8final
2005-124.94.0 to 5.8final
2006-014.94.1 to 5.8final
2006-025.04.1 to 5.8final
2006-035.04.1 to 5.9final
2006-045.04.2 to 5.9final
2006-055.14.2 to 5.9final
2006-065.14.2 to 6.0final
2006-075.14.2 to 6.0final
2006-085.24.3 to 6.0final
2006-095.24.3 to 6.1final
2006-105.24.3 to 6.1final
2006-115.24.3 to 6.1final
2006-125.34.4 to 6.2final
2007-015.34.4 to 6.2final
2007-025.44.5 to 6.3final
2007-035.44.5 to 6.4final
2007-045.54.6 to 6.4final
2007-055.64.7 to 6.5final
2007-065.64.7 to 6.5final
2007-075.74.8 to 6.6final
2007-085.74.8 to 6.7final
2007-095.84.9 to 6.7final
2007-105.94.9 to 6.8final
2007-115.95.0 to 6.8final
2007-126.05.0 to 6.9final
2008-016.05.1 to 6.9final
2008-026.15.1 to 7.0final
2008-036.15.2 to 7.0final
2008-046.25.2 to 7.1final
2008-056.25.3 to 7.1final
2008-066.25.3 to 7.2final
2008-076.35.3 to 7.2final
2008-086.35.4 to 7.3final
2008-096.45.4 to 7.3final
2008-106.45.5 to 7.4final
2008-116.55.5 to 7.4final
2008-126.55.6 to 7.5final
2009-016.65.6 to 7.5final
2009-026.65.7 to 7.6final
2009-036.65.7 to 7.6final
2009-046.75.7 to 7.6final
2009-056.75.8 to 7.7final
2009-066.85.8 to 7.7final
2009-076.85.9 to 7.8final
2009-086.95.9 to 7.8final
2009-096.95.9 to 7.9final
2009-106.96.0 to 7.9final
2009-117.06.0 to 7.9final
2009-127.06.1 to 8.0final
2010-017.16.1 to 8.0final
2010-027.16.2 to 8.1final
2010-037.26.2 to 8.1final
2010-047.26.3 to 8.2final
2010-057.36.3 to 8.2final
2010-067.36.4 to 8.3final
2010-077.46.4 to 8.4final
2010-087.46.5 to 8.4final
2010-097.56.5 to 8.5final
2010-107.56.6 to 8.5final
2010-117.66.6 to 8.6final
2010-127.66.7 to 8.6final
2011-017.76.7 to 8.7final
2011-027.76.8 to 8.7final
2011-037.86.8 to 8.8final
2011-047.86.9 to 8.8final
2011-057.96.9 to 8.9final
2011-067.96.9 to 8.9final
2011-078.07.0 to 9.0final
2011-088.07.0 to 9.0final
2011-098.17.1 to 9.1final
2011-108.17.1 to 9.1final
2011-118.27.2 to 9.2final
2011-128.27.2 to 9.2final
2012-018.37.3 to 9.3final
2012-028.37.3 to 9.3final
2012-038.47.4 to 9.4final
2012-048.47.4 to 9.4final
2012-058.57.5 to 9.5final
2012-068.57.5 to 9.5final
2012-078.67.6 to 9.6final
2012-088.67.6 to 9.7final
2012-098.77.7 to 9.7final
2012-108.87.8 to 9.8final
2012-118.87.8 to 9.8final
2012-128.97.9 to 9.9final
2013-018.97.9 to 9.9final
2013-029.08.0 to 10.0final
2013-039.18.0 to 10.1final
2013-049.18.1 to 10.1final
2013-059.28.2 to 10.2final
2013-069.28.2 to 10.3final
2013-079.38.3 to 10.3final
2013-089.48.4 to 10.4final
2013-099.48.4 to 10.5final
2013-109.58.5 to 10.5final
2013-119.68.5 to 10.6final
2013-129.68.6 to 10.7final
2014-019.78.7 to 10.7final
2014-029.88.7 to 10.8final
2014-039.88.8 to 10.8final
2014-049.98.8 to 10.9final
2014-059.98.9 to 11.0final
2014-0610.09.0 to 11.0final
2014-0710.19.0 to 11.1final
2014-0810.19.1 to 11.2final
2014-0910.29.1 to 11.2final
2014-1010.29.2 to 11.3final
2014-1110.39.3 to 11.3final
2014-1210.49.3 to 11.4final
2015-0110.49.4 to 11.5final
2015-0210.49.4 to 11.5final
2015-0310.59.4 to 11.5final
2015-0410.59.5 to 11.6final
2015-0510.69.5 to 11.6final
2015-0610.69.6 to 11.7final
2015-0710.69.6 to 11.7final
2015-0810.79.6 to 11.7final
2015-0910.79.7 to 11.8final
2015-1010.89.7 to 11.8final
2015-1110.89.7 to 11.9final
2015-1210.89.8 to 11.9final
2016-0110.99.8 to 11.9final
2016-0210.99.8 to 11.9final
2016-0310.99.8 to 12.0final
2016-0410.99.9 to 12.0final
2016-0510.99.9 to 12.0final
2016-0611.09.9 to 12.0final
2016-0711.09.9 to 12.1final
2016-0811.09.9 to 12.1final
2016-0911.010.0 to 12.1final
2016-1011.110.0 to 12.1final
2016-1111.110.0 to 12.2final
2016-1211.110.0 to 12.2final
2017-0111.110.1 to 12.2final
2017-0211.210.1 to 12.3final
2017-0311.210.1 to 12.3final
2017-0411.210.2 to 12.3final
2017-0511.310.2 to 12.4final
2017-0611.310.2 to 12.4final
2017-0711.410.3 to 12.4final
2017-0811.410.3 to 12.5final
2017-0911.410.3 to 12.5final
2017-1011.510.4 to 12.6final
2017-1111.510.4 to 12.6final
2017-1211.510.4 to 12.6final
2018-0111.610.5 to 12.7final
2018-0211.610.5 to 12.7final
2018-0311.710.6 to 12.8final
2018-0411.710.6 to 12.8final
2018-0511.810.7 to 12.9final
2018-0611.810.7 to 12.9final
2018-0711.910.8 to 13.0final
2018-0811.910.8 to 13.0final
2018-0912.010.9 to 13.1final
2018-1012.010.9 to 13.1final
2018-1112.111.0 to 13.2final
2018-1212.111.0 to 13.3final
2019-0112.211.1 to 13.3final
2019-0212.211.1 to 13.3final
2019-0312.311.1 to 13.4final
2019-0412.311.2 to 13.4final
2019-0512.311.2 to 13.5final
2019-0612.411.2 to 13.5final
2019-0712.411.3 to 13.6final
2019-0812.511.3 to 13.6final
2019-0912.511.4 to 13.6final
2019-1012.511.4 to 13.7final
2019-1112.611.4 to 13.7final
2019-1212.611.5 to 13.8final
2020-0112.711.5 to 13.8final
2020-0212.711.5 to 13.8final
2020-0312.711.6 to 13.9final
2020-0412.711.6 to 13.9final
2020-0512.811.6 to 13.9final
2020-0612.811.6 to 14.0final
2020-0712.811.7 to 14.0final
2020-0812.911.7 to 14.0final
2020-0912.911.7 to 14.0final
2020-1012.911.8 to 14.1final
2020-1112.911.8 to 14.1final
2020-1213.011.8 to 14.1final
2021-0113.011.8 to 14.2final
2021-0213.011.8 to 14.2final
2021-0313.011.9 to 14.2final
2021-0413.111.9 to 14.3final
2021-0513.111.9 to 14.3final
2021-0613.111.9 to 14.3final
2021-0713.111.9 to 14.4final
2021-0813.211.9 to 14.4final
2021-0913.211.9 to 14.4final
2021-1013.212.0 to 14.5final
2021-1113.212.0 to 14.5final
2021-1213.312.0 to 14.5final
2022-0113.312.0 to 14.6final
2022-0213.312.0 to 14.6final
2022-0313.312.0 to 14.6final
2022-0413.312.0 to 14.6final
2022-0513.312.0 to 14.6final
2022-0613.312.0 to 14.6final
2022-0713.311.9 to 14.6final
2022-0813.311.9 to 14.6final
2022-0913.211.9 to 14.6final
2022-1013.211.8 to 14.6final
2022-1113.211.8 to 14.5final
2022-1213.211.8 to 14.5final
2023-0113.211.8 to 14.5final
2023-0213.211.8 to 14.6final
2023-0313.211.8 to 14.6final
2023-0413.211.8 to 14.6final
2023-0513.211.8 to 14.6final
2023-0613.211.8 to 14.6final
2023-0713.211.8 to 14.6final
2023-0813.211.8 to 14.6final
2023-0913.211.8 to 14.7final
2023-1013.311.8 to 14.7final
2023-1113.311.8 to 14.7final
2023-1213.311.9 to 14.7final
Calculated by Environment Dashboard from 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. Changes: sign flipped from mass balance (negative for ice loss) to contribution to sea level (positive for a rise). Open Government Licence v3.0.

Where it comes from

Producer
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)
Version
1.0
Fetched
2026-10-05 (automatically), 83,257 bytes
Fingerprint
sha256 cdb5f37c703af3fb36ccbf89f6ca0ba8b444817cb48ff34cc77ca7a9d9a525b2 · Last-Modified Mon, 06 Jul 2026 10:07:40 GMT
Copies
No Wayback copy recorded yet.Our copy of the exact file
Cite the producer
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
Producer
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)
Version
1.0
Fetched
2026-10-05 (automatically), 89,834 bytes
Fingerprint
sha256 2a45ff6a5ca9492762421fb4dc895dc9c5a9744b91f9e7ad764c48b699cdede9 · Last-Modified Mon, 06 Jul 2026 10:07:40 GMT
Copies
No Wayback copy recorded yet.Our copy of the exact file
Cite the producer
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

What was done to it

  1. Read the 'Cumulative mass balance anomaly (mm)' column and its uncertainty from imbie3_antarctica_mm_partitioned.csv (IMBIE version 1.0), 1979-01 to 2023-12.

    Code: pipeline/src/envdash/transforms/ice/imbie_2026.py · code sha256 890ecd9e82cc65eb… · inputs cdb5f37c703a… 2a45ff6a5ca9…

  2. Checked every month against imbie3_antarctica_Gt_partitioned.csv: the mm value and its uncertainty equal the Gt values divided by 360 (IMBIE's 360 Gt of ice per mm of sea level), so the mm column has the mass-balance sign, negative for a loss of ice.

    Code: pipeline/src/envdash/transforms/ice/imbie_2026.py · code sha256 890ecd9e82cc65eb… · inputs cdb5f37c703a… 2a45ff6a5ca9…

  3. Flipped the sign, so that a positive value is a rise in global mean sea level. Lower and upper are the flipped value minus and plus the one-sigma uncertainty.

    Code: pipeline/src/envdash/transforms/ice/imbie_2026.py · code sha256 890ecd9e82cc65eb… · inputs cdb5f37c703a… 2a45ff6a5ca9…

What it covers

Geography
Antarctic Ice Sheet (West and East Antarctica and the Antarctic Peninsula)
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. Positive values raise global mean sea level; 360 Gt of ice = 1 mm.
Unit
millimetres (mm)