Antarctica Remains the Wild Card for Sea-Level Rise Estimates Through 2100
A massive collaborative research project covered in the journal Nature this week offers projections to the year 2100 of future sea-level rise from all sources of land ice, offering the most complete projections created to date.
The estimates show that limiting global warming to 1.5 degrees C above pre-industrial temperatures would cut projected 21st century sea-level rise from land ice in half, relative to currently pledged emissions reductions. For example, the paper notes that, when looking at all land ice sources, the median projection of cumulative rise in sea level by the year 2100 decreases from approximately 25 cm to approximately 13 cm when emissions are limited.
The term “land ice” includes mountain glaciers such as those in Alaska, Europe, high-mountain Asia, etc.; ice caps including those of Iceland and the Canadian Arctic; and ice sheets in Greenland and Antarctica.
Continental wild card
Interestingly, Price points out, Antarctica continues to be the wild card. “Future changes to Antarctica remain highly uncertain,” he said. “Because of this, our high-end estimates for sea-level rise from land ice are more than twice as large as the ‘most likely’ estimate.” This is largely due to substantial uncertainty in how strongly warm ocean waters erode floating parts of the ice sheet from beneath.
Apart from that uncertainty, the bulk of the Antarctic sea-level rise projections do not show a strong sensitivity to different emissions scenarios, but a small number of projections result in an up to five-fold increase in sea-level contribution, Price said. Indeed, improving DOE’s ability to accurately simulate Southern Hemisphere climate and Antarctic ice sheet evolution has been a focus of Los Alamos efforts for more than a decade.
Contacts and sources:
DOE/Los Alamos National Laboratory
Publication: Projected land ice contributions to twenty-first-century sea level rise.
Tamsin L. Edwards, Sophie Nowicki, Ben Marzeion, Regine Hock, Heiko Goelzer, Hélène Seroussi, Nicolas C. Jourdain, Donald A. Slater, Fiona E. Turner, Christopher J. Smith, Christine M. McKenna, Erika Simon, Ayako Abe-Ouchi, Jonathan M. Gregory, Eric Larour, William H. Lipscomb, Antony J. Payne, Andrew Shepherd, Cécile Agosta, Patrick Alexander, Torsten Albrecht, Brian Anderson, Xylar Asay-Davis, Andy Aschwanden, Alice Barthel, Andrew Bliss, Reinhard Calov, Christopher Chambers, Nicolas Champollion, Youngmin Choi, Richard Cullather, Joshua Cuzzone, Christophe Dumas, Denis Felikson, Xavier Fettweis, Koji Fujita, Benjamin K. Galton-Fenzi, Rupert Gladstone, Nicholas R. Golledge, Ralf Greve, Tore Hattermann, Matthew J. Hoffman, Angelika Humbert, Matthias Huss, Philippe Huybrechts, Walter Immerzeel, Thomas Kleiner, Philip Kraaijenbrink, Sébastien Le clec’h, Victoria Lee, Gunter R. Leguy, Christopher M. Little, Daniel P. Lowry, Jan-Hendrik Malles, Daniel F. Martin, Fabien Maussion, Mathieu Morlighem, James F. O’Neill, Isabel Nias, Frank Pattyn, Tyler Pelle, Stephen F. Price, Aurélien Quiquet, Valentina Radić, Ronja Reese, David R. Rounce, Martin Rückamp, Akiko Sakai, Courtney Shafer, Nicole-Jeanne Schlegel, Sarah Shannon, Robin S. Smith, Fiammetta Straneo, Sainan Sun, Lev Tarasov, Luke D. Trusel, Jonas Van Breedam, Roderik van de Wal, Michiel van den Broeke, Ricarda Winkelmann, Harry Zekollari, Chen Zhao, Tong Zhang, Thomas Zwinger. Nature, 2021; 593 (7857): 74 DOI: 10.1038/s41586-021-03302-y
Source: http://www.ineffableisland.com/2021/05/antarctica-remains-wild-card-for-sea.html
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LET alone ASTRO PHYSICS…………NEVER LISTEN TO IDIOTS…..ALTON FALLS INTO THAT CATEGORY..