1. The IMBIE team. Mass balance of the Antarctic Ice Sheet from 1992 to 2017. Nature 558, 219–222 (2018).

2. Forsberg, R., Sørensen, L. & Simonsen, S. Greenland and Antarctic Ice Sheet mass changes and effects on global sea level. Surv. Geophys. 38, 89–104 (2017).

3. Chen, X. et al. The increasing rate of global mean sea-level rise during 1993–2014. Nat. Clim. Chang. 7, 492–495 (2017).

4. Huss, M. & Hock, R. A new model for global glacier change and sea-level rise. Front. Earth Sci. 3, 54 (2015).

5. Bamber, J. L., Westaway, R. M., Marzeion, B. & Wouters, B. The land ice contribution to sea level during the satellite era. Environ. Res. Lett. 13, 063008 (2018).

6. Dieng, H. B., Cazenave, A., Meyssignac, B. & Ablain, M. New estimate of the current rate of sea level rise from a sea level budget approach. Geophys. Res. Lett. 44, 3744–3751 (2017).

7. Caesar, L., Rahmstorf, S., Robinson, A., Feulner, G. & Saba, V. Observed fingerprint of a weakening Atlantic Ocean overturning circulation. Nature 556, 191–196 (2018).

8. Thornalley, D. J. R. et al. Anomalously weak Labrador Sea convection and Atlantic overturning during the past 150 years. Nature 556, 227–230 (2018).

9. Raftery, A. E., Zimmer, A., Frierson, D. M. W., Startz, R. & Liu, P. Less than 2 °C warming by 2100 unlikely. Nat. Clim. Chang. 7, 637–641 (2017).

10. Lenton, T. M. et al. Tipping elements in the Earth’s climate system. Proc. Natl Acad. Sci. USA 105, 1786–1793 (2008).

11. Rignot, E., Mouginot, J., Morlighem, M., Seroussi, H. & Scheuchl, B. Widespread, rapid grounding line retreat of Pine Island, Thwaites, Smith, and Kohler glaciers, West Antarctica, from 1992 to 2011. Geophys. Res. Lett. 41, 3502–3509 (2014).

12. Joughin, I., Smith, B. E. & Medley, B. Marine ice sheet collapse potentially under way for the Thwaites Glacier basin, West Antarctica. Science 344, 735–738 (2014).

13. Vitousek, S. et al. Doubling of coastal flooding frequency within decades due to sea-level rise. Sci. Rep. 7, 1399 (2017).

14. King, A. D. & Harrington, L. J. The inequality of climate change from 1.5 to 2 °C of global warming. Geophys. Res. Lett. 45, 5030–5033 (2018).

15. Kopp, R. E. et al. Evolving understanding of Antarctic ice-sheet physics and ambiguity in probabilistic sea-level projections. Earths Futur. 5, 1217–1233 (2017).

16. Jackson, L. P., Grinsted, A. & Jevrejeva, S. 21st century sea-level rise in line with the Paris Accord. Earths Futur. 6, 213–229 (2018).

17. Ritz, C. et al. Potential sea-level rise from Antarctic ice-sheet instability constrained by observations. Nature 528, 115–118 (2015).

18. Golledge, N. et al. The multi-millennial Antarctic commitment to future sea-level rise. Nature 526, 421–425 (2015).

19. Vizcaino, M. et al. Coupled simulations of Greenland Ice Sheet and climate change up to A.D. 2300. Geophys. Res. Lett. 42, 3927–3935 (2015).

20. DeConto, R. & Pollard, D. Contribution of Antarctica to past and future sea-level rise. Nature 531, 591–597 (2016).

21. Weaver, A. J. et al. Stability of the Atlantic meridional overturning circulation: a model intercomparison. Geophys. Res. Lett. 39, L20709 (2012).

22. Collins, M. et al. in Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (eds Stocker, T. et al.) 1029–1136 (Cambridge Univ. Press, Cambridge, 2013).

23. Bintanja, R., van Oldenborgh, G. J. & Katsman, C. A. The effect of increased fresh water from Antarctic ice shelves on future trends in Antarctic sea ice. Ann. Glaciol. 56, 120–126 (2015).

24. Bueler, E. & Brown, J. Shallow shelf approximation as a “sliding law” in a thermomechanically coupled ice sheet model. J. Geophys. Res. 114, F03008 (2009).

25. Bernales, J., Rogozhina, I. & Thomas, M. Melting and freezing under Antarctic ice shelves from a combination of ice-sheet modelling and observations. J. Glaciol. 63, 731–744 (2017).

26. Golledge, N. et al. Antarctic contribution to meltwater pulse 1A from reduced Southern Ocean overturning. Nat. Commun. 5, 5107 (2014).

27. Bakker, P., Clark, P. U., Golledge, N. R., Schmittner, A. & Weber, M. E. Centennial-scale Holocene climate variations amplified by Antarctic Ice Sheet discharge. Nature 541, 72–76 (2017).

28. Menviel, L., Timmermann, A., Timm, O. E. & Mouchet, A. Climate and biogeochemical response to a rapid melting of the West Antarctic Ice Sheet during interglacials and implications for future climate. Paleoceanography 25, PA4231 (2010).

29. Weber, M. et al. Millennial-scale variability in Antarctic ice-sheet discharge during the last deglaciation. Nature 510, 134–138 (2014).

30. Bronselaer, B. et al. Change in future climate due to Antarctic meltwater. Nature 564, 53–58 (2018).

31. Frölicher, T. L., Fischer, E. M. & Gruber, N. Marine heatwaves under global warming. Nature 560, 360–364 (2018).

32. Ruthrof, K. X. et al. Subcontinental heat wave triggers terrestrial and marine, multi-taxa responses. Sci. Rep. 8, 13094 (2018).

33. Hutchings, J. K. & Perovich, D. K. Preconditioning of the 2007 sea-ice melt in the eastern Beaufort Sea, Arctic Ocean. Ann. Glaciol. 56, 94–98 (2015).

34. Rahmstorf, S. Bifurcations of the Atlantic thermohaline circulation in response to changes in the hydrological cycle. Nature 378, 145–149 (1995).

35. Stommel, H. Thermohaline convection with two stable regimes of flow. Tellus 13, 224–230 (1961).

36. Bakker, P. et al. Fate of the Atlantic Meridional Overturning Circulation: strong decline under continued warming and Greenland melting. Geophys. Res. Lett. 43, 12252–12260 (2016).

37. Liu, W., Xie, S.-P., Liu, Z. & Zhu, J. Overlooked possibility of a collapsed Atlantic Meridional Overturning Circulation in warming climate. Sci. Adv. 3, e1601666 (2017).

38. Rind, D. et al. Multi-century instability of the Atlantic Meridional Circulation in rapid warming simulations with GISS ModelE2. J. Geophys. Res. 123, 6331–6355 (2018).

39. Edwards, T. L. et al. Revisiting Antarctic ice loss due to marine ice-cliff instability. Nature 566, https://doi.org/10.1038/s41586-019-0901-4 (2019).

40. Noël, B. et al. A tipping point in refreezing accelerates mass loss of Greenland’s glaciers and ice caps. Nat. Commun. 8, 14730 (2017).

41. Machguth, H. et al. Greenland meltwater storage in firn limited by near-surface ice formation. Nat. Clim. Chang. 6, 390–393 (2016).

42. Fettweis, X. et al. Estimating the Greenland ice sheet surface mass balance contribution to future sea level rise using the regional atmospheric climate model MAR. Cryosphere 7, 469–489 (2013).

43. Shannon, S. R. et al. Enhanced basal lubrication and the contribution of the Greenland ice sheet to future sea-level rise. Proc. Natl Acad. Sci. USA 110, 14156–14161 (2013).

44. Fürst, J. J., Goelzer, H. & Huybrechts, P. Ice-dynamic projections of the Greenland ice sheet in response to atmospheric and oceanic warming. Cryosphere 9, 1039–1062 (2015).

45. Seroussi, H. et al. Continued retreat of Thwaites Glacier, West Antarctica, controlled by bed topography and ocean circulation. Geophys. Res. Lett. 44, 6191–6199 (2017).

46. Medley, B. et al. Temperature and snowfall in western Queen Maud Land increasing faster than climate model projections. Geophys. Res. Lett. 45, 1472–1480 (2018).

47. Phillips, H. A. Surface meltstreams on the Amery ice shelf, East Antarctica. Ann. Glaciol. 27, 177–181 (1998).

48. Bevan, S. L. et al. Centuries of intense surface melt on Larsen C ice shelf. Cryosphere 11, 2743–2753 (2017).

49. Trusel, L. D. et al. Divergent trajectories of Antarctic surface melt under two twenty-first-century climate scenarios. Nat. Geosci. 8, 927–932 (2015).

50. Bell, R. E., Banwell, A., Trusel, L. & Kingslake, J. Antarctic surface hydrology and impacts on ice sheet mass balance. Nat. Clim. Chang. 8, 1044–1052 (2018).

51. Winkelmann, R. et al. The Potsdam Parallel Ice Sheet Model (PISM-PIK) – part 1: model description. Cryosphere 5, 715–726 (2011).

52. Aschwanden, A., Bueler, E., Khroulev, C. & Blatter, H. An enthalpy formulation for glaciers and ice sheets. J. Glaciol. 58, 441–457 (2012).

53. Feldmann, J., Albrecht, T., Khroulev, C., Pattyn, F. & Levermann, A. Resolution-dependent performance of grounding line motion in a shallow model compared to a full-Stokes model according to the MISMIP3d intercomparison. J. Glaciol. 60, 353–360 (2014).

54. Golledge, N. R. et al. Antarctic climate and ice sheet configuration during a peak-warmth early Pliocene interglacial. Clim. Past 13, 959–975 (2017).

55. Seroussi, H. & Morlighem, M. Representation of basal melting at the grounding line in ice flow models. Cryosphere 12, 3085–3096 (2018).

56. Milillo, P. et al. On the short-term grounding zone dynamics of Pine Island Glacier, West Antarctica, observed with COSMO-SkyMed interferometric data. Geophys. Res. Lett. 44, 10436–10444 (2017).

57. van den Broeke, M., Bus, C., Ettema, J. & Smeets, P. Temperature thresholds for degree-day modelling of Greenland ice sheet melt rates. Geophys. Res. Lett. 37, L18501 (2010).

58. Hellmer, H. & Olbers, D. A two-dimensional model for the thermohaline circulation under an ice shelf. Antarct. Sci. 1, 325–336 (1989).

59. Rignot, E. & Jacobs, S. S. Rapid bottom melting widespread near Antarctic Ice Sheet grounding lines. Science 296, 2020–2023 (2002).

60. Hellmer, H., Kauker, F., Timmermann, R., Determann, J. & Rae, J. Twenty-first-century warming of a large Antarctic ice-shelf cavity by a redirected coastal current. Nature 485, 225–228 (2012).

61. Levermann, A. et al. Kinematic first-order calving law implies potential for abrupt ice-shelf retreat. Cryosphere 6, 273–286 (2012).

62. Fretwell, P. et al. Bedmap2: improved ice bed, surface and thickness datasets for Antarctica. Cryosphere 7, 375–393 (2013).

63. Morlighem, M. et al. BedMachine v3: complete bed topography and ocean bathymetry mapping of Greenland from multibeam echo sounding combined with mass conservation. Geophys. Res. Lett. 44, 11051–11061 (2017).

64. Van Wessem, J. et al. Improved representation of East Antarctic surface mass balance in a regional atmospheric climate model. J. Glaciol. 60, 761–770 (2014).

65. Ettema, J. et al. Higher surface mass balance of the Greenland ice sheet revealed by high-resolution climate modeling. Geophys. Res. Lett. 36, L12501 (2009).

66. Martos, Y. M. et al. Heat flux distribution of Antarctica unveiled. Geophys. Res. Lett. 44, 11417–11426 (2017).

67. Shapiro, N. & Ritzwoller, M. Inferring surface heat flux distributions guided by a global seismic model: particular application to Antarctica. Earth Planet. Sci. Lett. 223, 213–224 (2004).

68. Sallée, J.-B. et al. Assessment of Southern Ocean water mass circulation and characteristics in CMIP5 models: historical bias and forcing response. J. Geophys. Res. 118, 1830–1844 (2013).

69. Turner, J., Bracegirdle, T. J., Phillips, T., Marshall, G. J. & Hosking, J. S. An initial assessment of Antarctic sea ice extent in the CMIP5 models. J. Clim. 26, 1473–1484 (2013).

70. Bracegirdle, T. J. et al. Assessment of surface winds over the Atlantic, Indian, and Pacific Ocean sectors of the Southern Ocean in CMIP5 models: historical bias, forcing response, and state dependence. J. Geophys. Res. 118, 547–562 (2013).

71. Naughten, K. A. et al. Future projections of Antarctic ice shelf melting based on CMIP5 scenarios. J. Clim. 31, 5243–5261 (2018).

72. Goosse, H. et al. Description of the Earth system model of intermediate complexity LOVECLIM version 1.2. Geosci. Model Dev. 3, 603–633 (2010).

73. Gent, P. R. & McWilliams, J. C. Isopycnal mixing in ocean circulation models. J. Phys. Oceanogr. 20, 150–155 (1990).

74. Menviel, L., Timmermann, A., Timm, O. E. & Mouchet, A. Deconstructing the Last Glacial termination: the role of millennial and orbital-scale forcings. Quat. Sci. Rev. 30, 1155–1172 (2011).

75. Abram, N. J. et al. Early onset of industrial-era warming across the oceans and continents. Nature 536, 411–418 (2016).

76. Menviel, L. et al. Southern Hemisphere westerlies as a driver of the early deglacial atmospheric CO 2 rise. Nat. Commun. 9, 2503 (2018).

77. Randall, D. A. et al. in Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (eds Solomon, S. et al.) 589–662 (Cambridge Univ. Press, Cambridge, 2007).

78. Gomez, N., Mitrovica, J. X., Huybers, P. & Clark, P. U. Sea level as a stabilizing factor for marine-ice-sheet grounding lines. Nat. Geosci. 3, 850–853 (2010).

79. Dziewonski, A. M. & Anderson, D. L. Preliminary reference Earth model. Phys. Earth Planet. Inter. 25, 297–356 (1981).

80. Lambeck, K., Smither, C. & Ekman, M. Tests of glacial rebound models for Fennoscandinavia based on instrumented sea- and lake-level records. Geophys. J. Int. 135, 375–387 (1998).

81. Mitrovica, J. X. & Forte, A. M. A new inference of mantle viscosity based upon joint inversion of convection and glacial isostatic adjustment data. Earth Planet. Sci. Lett. 225, 177–189 (2004).

82. Lambeck, K., Rouby, H., Purcell, A., Sun, Y. & Sambridge, M. Sea level and global ice volumes from the Last Glacial Maximum to the Holocene. Proc. Natl Acad. Sci. USA 111, 15296–15303 (2014).

83. Stuhne, G. & Peltier, W. Reconciling the ICE-6G_C reconstruction of glacial chronology with ice sheet dynamics: the cases of Greenland and Antarctica. J. Geophys. Res. 120, 1841–1865 (2015).

84. Aschwanden, A., Fahnestock, M. A. & Truffer, M. Complex Greenland outlet glacier flow captured. Nat. Commun. 7, 10524 (2016).

85. Pauling, A. G., Bitz, C. M., Smith, I. J. & Langhorne, P. J. The response of the Southern Ocean and Antarctic sea ice to freshwater from ice shelves in an Earth system model. J. Clim. 29, 1655–1672 (2016).

86. Merino, N. et al. Impact of increasing Antarctic glacial freshwater release on regional sea-ice cover in the Southern Ocean. Ocean Model. 121, 76–89 (2018).

87. Dong, S., Sprintall, J., Gille, S. T. & Talley, L. Southern Ocean mixed-layer depth from Argo float profiles. J. Geophys. Res. 113, C06013 (2008).

88. Dutrieux, P. et al. Strong sensitivity of Pine Island ice-shelf melting to climatic variability. Science 343, 174–178 (2014).

89. Webber, B. G. et al. Mechanisms driving variability in the ocean forcing of Pine Island Glacier. Nat. Commun. 8, 14507 (2017).

90. Thompson, A. F., Heywood, K. J., Schmidtko, S. & Stewart, A. L. Eddy transport as a key component of the Antarctic overturning circulation. Nat. Geosci. 7, 879–884 (2014).

91. Stewart, A. L. & Thompson, A. F. Eddy-mediated transport of warm Circumpolar Deep Water across the Antarctic Shelf Break. Geophys. Res. Lett. 42, 432–440 (2015).

92. Naughten, K. A. et al. Intercomparison of Antarctic ice-shelf, ocean, and sea-ice interactions simulated by MetROMS-iceshelf and FESOM 1.4. Geosci. Model Dev. 11, 1257–1292 (2018).

93. Wessel, P., Smith, W. H., Scharroo, R., Luis, J. & Wobbe, F. Generic mapping tools: improved version released. Eos 94, 409–410 (2013).

94. Crameri, F. Geodynamic diagnostics, scientific visualisation and StagLab 3.0. Geosci. Model Dev. 11, 2541–2562 (2018).

95. Kovesi, P. Good colour maps: how to design them. Preprint at https://arxiv.org/abs/1509.03700 (2015).

96. Zwally, H. J., Giovinetto, M. B., Beckley, M. A. & Saba, J. L. Antarctic and Greenland Drainage Systems. GSFC Cryospheric Sciences Laboratory http://icesat4.gsfc.nasa.gov/cryo_data/ant_grn_drainage_systems.php (2012).

97. Scambos, T. A., Haran, T. M., Fahnestock, M. A., Painter, T. H. & Bohlander, J. Modis-based Mosaic of Antarctica (MOA) data sets: continent-wide surface morphology and snow grain size. Remote Sens. Environ. 111, 242–257 (2007).

98. Haran, T., Bohlander, J., Scambos, T., Painter, T., and Fahnestock, M. MODIS Mosaic of Antarctica 2008–2009 (MOA2009) Image Map. National Snow and Ice Data Center https://doi.org/10.7265/N5KP8037 (2014).

99. Rignot, E., Jacobs, S., Mouginot, J. & Scheuchl, B. Ice-shelf melting around Antarctica. Science 341, 266–270 (2013).

100. Depoorter, M. A. et al. Calving fluxes and basal melt rates of Antarctic ice shelves. Nature 502, 89–92 (2013).

101. Nagler, T., Rott, H., Hetzenecker, M., Wuite, J. & Potin, P. The Sentinel-1 mission: new opportunities for ice sheet observations. Remote Sens. 7, 9371–9389 (2015).

102. Rignot, E., Mouginot, J. & Scheuchl, B. Ice flow of the Antarctic Ice Sheet. Science 333, 1427–1430 (2011).

103. Rignot, E. et al. Recent Antarctic ice mass loss from radar interferometry and regional climate modelling. Nat. Geosci. 1, 106–110 (2008).

104. King, M. A. et al. Lower satellite-gravimetry estimates of Antarctic sea-level contribution. Nature 491, 586–589 (2012).

105. Helm, V., Humbert, A. & Miller, H. Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2. Cryosphere 8, 1539–1559 (2014).

106. Martín-Español, A. et al. Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data. J. Geophys. Res. 121, 182–200 (2016).

107. Gardner, A. S. et al. Increased West Antarctic and unchanged East Antarctic ice discharge over the last 7 years. Cryosphere 12, 521–547 (2018).

108. McMillan, M. et al. Increased ice losses from Antarctica detected by CryoSat-2. Geophys. Res. Lett. 41, 3899–3905 (2014).

109. Velicogna, I. & Wahr, J. Time-variable gravity observations of ice sheet mass balance: Precision and limitations of the GRACE satellite data. Geophys. Res. Lett. 40, 3055–3063 (2013).

110. Lenaerts, J., van den Broeke, M., van de Berg, W., van Meijgaard, E. & Munneke, P. A new, high-resolution surface mass balance map of Antarctica (1979–2010) based on regional atmospheric climate modeling. Geophys. Res. Lett. 39, L04501 (2012).

111. Turner, J., Connolley, W. M., Leonard, S., Marshall, G. J. & Vaughan, D. G. Spatial and temporal variability of net snow accumulation over the Antarctic from ECMWF re-analysis project data. Int. J. Climatol. 19, 697–724 (1999).

112. van de Berg, W. J., van den Broeke, M. R., Reijmer, C. H. & van Meijgaard, E. Reassessment of the Antarctic surface mass balance using calibrated output of a regional atmospheric climate model. J. Geophys. Res. 111, D11104 (2006).

113. Liu, Y. et al. Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves. Proc. Natl Acad. Sci. USA 112, 3263–3268 (2015).

114. Rignot, E., Box, J. E., Burgess, E. & Hanna, E. Mass balance of the Greenland ice sheet from 1958 to 2007. Geophys. Res. Lett. 35, L20502 (2008).

115. Shepherd, A. et al. A reconciled estimate of ice-sheet mass balance. Science 338, 1183–1189 (2012).

116. Rignot, E. & Kanagaratnam, P. Changes in the velocity structure of the Greenland ice sheet. Science 311, 986–990 (2006).

117. Sasgen, I. et al. Timing and origin of recent regional ice-mass loss in Greenland. Earth Planet. Sci. Lett. 333–334, 293–303 (2012).

118. Box, J. E., Bromwich, D. H. & Bai, L. S. Greenland ice sheet surface mass balance 1991–2000: application of polar MM5 mesoscale model and in situ data. J. Geophys. Res. 109, D16105 (2004).

119. Wilson, N. J., Straneo, F. & Heimbach, P. Satellite-derived submarine melt rates and mass balance (2011–2015) for Greenland’s largest remaining ice tongues. Cryosphere 11, 2773–2782 (2017).