The western edge of iceberg A68, as seen in 2017. Photo: NASA/Nathan Kurtz

Antarctica is shedding ice at an increasingly rapid rate, potentially imperiling coastlines around the world as sea levels increase in response, a new study finds.

Why it matters: Antarctica is already contributing a growing amount to sea level rise, the study found, and things could get much worse.

The big picture: The new study, published Monday in Proceedings of the National Academy of Sciences, found that Antarctica has shed ice at a growing rate in recent decades.

  • From 1979 to 1990, the average annual ice mass loss rate was 40 billion metric tons per year.
  • This jumped to 252 billion metric tons per year, between 2009 to 2017.

The study, from glaciologists at the University of California at Irvine and Netherlands' Utrecht University, also contains the worrisome conclusion that East Antarctica has been losing mass since the 1980s. That's important because previous studies had regarded that part of the continent as stable or not yet undergoing a net loss.

Details: Warming ocean waters are weakening floating ice shelves, which act like doorstops that keep massive amounts of inland ice from flowing quickly into the sea.

  • The warm waters, pumped in by natural variability and human-caused climate change, are melting such shelves from below, and the new study found the parts of Antarctica that are melting the fastest are ones that have an ocean influence.

The researchers set out to complete a comprehensive survey of the ice-bound continent using a variety of data sources, such as NASA aircraft reconnaissance and satellite measurements. They examined 18 regions that included 176 glacier basins.

  • The study took into account the balance between inland snowfall and coastal ice melt. As recently as 2001, scientists thought that increased snowfall could compensate for ice loss at the margins, but that is no longer the case.

What they're saying: "The really big questions are whether the recent acceleration in mass loss will continue, leading to rapid deglaciation of one or more basins and much faster sea-level rise," Richard Alley, a geosciences professor at Penn State University, told Axios via email. Alley was not involved in the new study.

  • "We do not know the answer to this, but we do know that the more humans warm the climate, the more likely it is that the ice will respond."
  • Robin Bell, who studies ice sheets at Columbia's Lamont-Doherty Earth Observatory, says the new study is a welcome addition to the literature on Antarctica. "[It] Shows how the ice sheets are in a different place and changing faster than we could have imagined in the 1970's," she said in an email to Axios.

What's next: Glaciologists need to reconcile the new study's findings with a large study published last year that found East Antarctica has not been losing ice so quickly, though it raised the possibility of future losses.

Go deeper:

Go deeper

59 mins ago - Sports

13 members of St. Louis Cardinals test positive for coronavirus

Photo: Hannah Foslien/Getty Images

Seven players and six staff members from the St. Louis Cardinals have tested positive for the coronavirus over the past week, prompting the MLB to postpone the team's upcoming four-game series against the Detroit Tigers.

Why it matters: Seven consecutive Cardinals games have now been canceled after St. Louis became the second team to report a significant coronavirus outbreak, just two weeks into the season.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 3 p.m. ET: 18,149,860 — Total deaths: 690,624 — Total recoveries — 10,753,318Map.
  2. U.S.: Total confirmed cases as of 3 p.m. ET: 4,690,404 — Total deaths: 155,124 — Total recoveries: 1,468,689 — Total tests: 56,812,162Map.
  3. Politics: White House will require staff to undergo randomized coronavirus testing — Pelosi says Birx "enabled" Trump on misinformation.
  4. Business: Virtual school is another setback for retail — The pandemic hasn't hampered health care.
  5. Public health: Former FDA chief says MLB outbreaks should be warning sign for schools.
2 hours ago - Podcasts

White House adviser Peter Navarro talks TikTok

President Trump has relaxed his threat to immediately ban the popular social media app TikTok, giving Microsoft room to negotiate an acquisition from Chinese tech giant ByteDance.

Axios Re:Cap digs into the situation with Peter Navarro, the White House's top trade adviser and a noted China hawk, who suggests Microsoft should be forced to make unrelated concessions related to its China operations.