Projected land ice contributions to twenty-first-century sea level rise

17199 12 94074 3 273770 document 94074 Edwards_et_al_2021_Nature_preprint.pdf application/pdf db982794640bd1585becf0bf91c39eb1 MD5 42319064 2021-05-10 07:09:19 https://pure.iiasa.ac.at/id/eprint/17199/1/Edwards_et_al_2021_Nature_preprint.pdf 17199 1 1 application/pdf text en public cc_by_nc_4

Edwards_et_al_2021_Nature_preprint.pdf

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/94074 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/94074 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/94074 archive 353 disk0/00/01/71/99 2021-05-07 12:01:02 2025-10-24 10:45:58 2021-05-07 12:01:02 article show Edwards T.L. Nowicki S. Marzeion B. Hock R. Goelzer H. Seroussi H. Jourdain N.C. Slater D.A. Turner F.E. Smith C. 9291 0000-0003-0599-4633 McKenna C.M. Simon E. Abe-Ouchi A. Gregory J.M. Larour E. Lipscomb W.H. Payne A.J. Shepherd A. Agosta C. Alexander P. Albrecht T. Anderson B. Asay-Davis X. Aschwanden A. Barthel A. Bliss A. Calov R. Chambers C. Champollion N. Choi Y. Cullather R. Cuzzone J. Dumas C. Felikson D. Fettweis X. Fujita K. Galton-Fenzi B.K. Gladstone R. Golledge N.R. Greve R. Hattermann T. Hoffman M.J. Humbert A. Huss M. Huybrechts P. Immerzeel W. Kleiner T. Kraaijenbrink P. Le clec’h S. Lee V. Leguy G.R. Little C.M. Lowry D.P. Malles J.-H. Martin D.F. Maussion F. Morlighem M. O’Neill J.F. Nias I. Pattyn F. Pelle T. Price S.F. Quiquet A. Radić V. Reese R. Rounce D.R. Rückamp M. Sakai A. Shafer C. Schlegel N.-J. Shannon S. Smith R.S. Straneo F. Sun S. Tarasov L. Trusel L.D. Van Breedam J. van de Wal R. van den Broeke M. Winkelmann R. Zekollari H. Zhao C. Zhang T. Zwinger T. Projected land ice contributions to twenty-first-century sea level rise pub ECE IACC The land ice contribution to global mean sea level rise has not yet been predicted1 using ice sheet and glacier models for the latest set of socio-economic scenarios, nor using coordinated exploration of uncertainties arising from the various computer models involved. Two recent international projects generated a large suite of projections using multiple models2-8, but primarily used previous-generation scenarios9 and climate models10, and could not fully explore known uncertainties. Here we estimate probability distributions for these projections under the new scenarios11,12 using statistical emulation of the ice sheet and glacier models. We find that limiting global warming to 1.5 degrees Celsius would halve the land ice contribution to twenty-first-century sea level rise, relative to current emissions pledges. The median decreases from 25 to 13 centimetres sea level equivalent (SLE) by 2100, with glaciers responsible for half the sea level contribution. The projected Antarctic contribution does not show a clear response to the emissions scenario, owing to uncertainties in the competing processes of increasing ice loss and snowfall accumulation in a warming climate. However, under risk-averse (pessimistic) assumptions, Antarctic ice loss could be five times higher, increasing the median land ice contribution to 42 centimetres SLE under current policies and pledges, with the 95th percentile projection exceeding half a metre even under 1.5 degrees Celsius warming. This would severely limit the possibility of mitigating future coastal flooding. Given this large range (between 13 centimetres SLE using the main projections under 1.5 degrees Celsius warming and 42 centimetres SLE using risk-averse projections under current pledges), adaptation planning for twenty-first-century sea level rise must account for a factor-of-three uncertainty in the land ice contribution until climate policies and the Antarctic response are further constrained. 2021-05-05 published Nature Publishing Group 10.1038/s41586-021-03302-y 3162 public Nature 593 7857 74-82 TRUE 0028-0836 PROjecTing sEa-level rise: from iCe sheets to local implicaTions (PROTECT, H2020 869304) Constraining uncertainty of multi decadal climate projections (CONSTRAIN, H2020 820829) Tipping Points in Antarctic Climate Components (TiPACCs, H2020 820575) FALSE yes info:eu-repo/grantAgreement/EC/H2020/869304/EU//PROTECT; info:eu-repo/grantAgreement/EC/H2020/820829/EU//CONSTRAIN; info:eu-repo/grantAgreement/EC/H2020/820575/EU//TiPACCs info:eu-repo/semantics/article info:eu-repo/semantics/embargoedAccess