Sea-level rise projections can improve with state-of-the-art model

Sea-level rise projections can improve with state-of-the-art model
The Crane Glacier on the Antarctic Peninsula in 2003. The peninsula's Larsen B Ice Shelf disintegrated into thousands of pieces in 2002, and the glacier retreated. Credit: Ted Scambos/NSIDC

Projections of potentially dramatic sea-level rise from ice-sheet melting in Antarctica have been wide-ranging, but a Rutgers-led team has created a model that enables improved projections and could help better address climate change threats.

A major source of sea-level rise could come from melting of large swaths of the vast Antarctic ice sheet. Fossil jutting above the ocean's surface show evidence that sea levels were more than 20 feet higher about 125,000 years ago during the warm Last Interglacial (Eemian) period.

"Evidence of sea-level rise in warm climates long ago can tell us a lot about how sea levels could rise in the future," said lead author Daniel M. Gilford, a post-doctoral associate in the lab of co-author Robert E. Kopp, a professor in the Department of Earth and Planetary Sciences within the School of Arts and Sciences at Rutgers University-New Brunswick. "This evidence suggests that as climate change drives warming in the atmosphere and oceans, future global sea-level rise could reach considerable heights."

The study, published in the journal JGR: Earth Surface, delves into how paleoclimate evidence from about 125,000 years ago can be used to improve computer model projections of Antarctic ice-sheet collapse and sea-level rise. Such evidence is increasingly effective for improving projections, providing valuable insights into ice sheet vulnerability through at least 2150.

Sea-level rise projections can improve with state-of-the-art model
Improved paleoclimate estimates can shift projections and narrow uncertainties in emulated future sea-level rise from Antarctica (shown in 2100). Credit: Daniel M. Gilford

The study takes advantage of the similarities between past and potential future sea levels to train a statistical ice-sheet model, using artificial intelligence. The fast, simple, less expensive "emulator"—a form of machine learning software—is taught to mimic the behavior of a complex model that focuses on ice-sheet physics, enabling many more simulations than could be explored with the complex model alone. This avoids the costly run times of the complex ice-sheet model, which considers such phenomena as ice-sheet fractures due to surface melting and the collapse of tall seaside ice cliffs.

What may happen to the Antarctic ice sheet as the climate warms is the biggest uncertainty when it comes to global sea-level rise this century, the study notes. When combined with evidence of past sea levels, the new can boost confidence in projections through at least 2150.

"If big swaths of the Antarctic ice sheet melted and collapsed about 125,000 years ago, when the polar regions were warmer than today, parts of the ice sheet may be similarly prone to collapse in the future as the climate warms, affecting our expectations of rise and coastline flooding over the next 130 years," Gilford said.

Sea-level rise projections can improve with state-of-the-art model
Paleoclimate evidence is increasingly valuable over time for boosting confidence in projections of future sea-level rise from Antarctica. Credit: Daniel M. Gilford

New estimates of sea levels about 125,000 years ago could be used to indicate whether, 75 years from now, Hurricane Sandy-like flooding (about 9 feet above ground level in New York City) is likely to occur once a century or annually along parts of the Northeast U.S. coastline. Improved projections could also be included in reports such as the Intergovernmental Panel on Climate Change's upcoming Sixth Assessment Report, likely helping officials and others decide how to address change threats.

Co-authors include Erica L. Ashe, a post-doctoral scientist in Kopp's lab, along with scientists at the University of Massachusetts Amherst, Pennsylvania State University and the University of Bremen.


Explore further

Antarctic ice loss expected to affect future climate change

More information: Daniel M. Gilford et al, Could the Last Interglacial Constrain Projections of Future Antarctic Ice Mass Loss and Sea‐level Rise?, Journal of Geophysical Research: Earth Surface (2020). DOI: 10.1029/2019JF005418
Provided by Rutgers University
Citation: Sea-level rise projections can improve with state-of-the-art model (2020, October 7) retrieved 31 October 2020 from https://phys.org/news/2020-10-sea-level-state-of-the-art.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
35 shares

Feedback to editors

User comments