Massive Polar Ice Sheet Loss Documented Over Five Decades

A collaborative team of polar scientists combined 42 independent satellite-derived estimates to produce the longest continuous record of Greenland and Antarctic ice-sheet mass balance, covering the late 1970s through 2023. The two ice sheets have lost a combined 11.3 trillion metric tons of ice, enough to raise global sea level by roughly one inch (3 cm).

GizmodoUsNews and World ReportIce loss still occurring in Antarctica, but something has tipped the scales as a balancing act

Researchers merged observations of ice-sheet flow, volume changes, and gravitational effects from 27 satellites and 45 independent surveys, reconciling differing processing techniques to generate a single assessment of mass change. This expands earlier work that relied mainly on European satellite data from the 1990s, adding NASA observations that extend Antarctic coverage back to 1979 and Greenland back to 1972.

Gizmodo

• Total mass loss: 11.3 trillion metric tons.

Gizmodo

• Sea-level rise: ~1 inch (3 cm) since 1979.

Bozeman Daily Chronicle

• Discharge vs. surface melt: 84 % of loss stems from glaciers accelerating into the ocean, 16 % from surface melt.

Gizmodo

• Regional differences: In the 2010s Greenland’s loss was two-thirds discharge-driven; Antarctica’s loss was entirely discharge-driven, dominated by West Antarctic outlet glaciers such as Pine Island and Thwaites.

Gizmodo

Warmer ocean waters erode ice shelves from below and along margins, prompting faster glacier flow. Atmospheric warming still influences surface melt, especially in Greenland, but the long-term trend points to oceanic forcing as the primary mechanism. A brief slowdown in net loss from 2020-2023 reflected short-term weather variability rather than a reversal of the underlying trajectory.

Bozeman Daily Chronicle

• Magnitude discrepancy: Gizmodo reports a loss of 11.3 trillion tons, while US News and Bozeman Daily Chronicle cite 12.5 trillion tons (equivalent to 11.3 trillion metric tons). Both figures stem from unit conversions in the source articles.

Gizmodo

• Antarctic mass balance nuance: The Weather Network describes a net mass gain in East Antarctica from 2020-2024 due to record snowfall, a detail not emphasized in the primary study summary, introducing uncertainty about short-term variability versus long-term trends.

Ice loss still occurring in Antarctica, but something has tipped the scales as a balancing act

• “What we really wanted to do is to produce a very comprehensive and robust estimate,” — Inès Otosaka, lead author

Gizmodo

• “Here we really found that the main cause of ice loss from the ice sheets is the latter, where you have glaciers that are flowing faster into the ocean,” — Inès Otosaka, lead author

Gizmodo

• “The use of relatively independent methods gives me greater confidence in the result,” — David Holland, York University ice scientist

UsNews and World Report

The finer-grained analysis will improve projections of sea-level rise and inform climate-adaptation strategies.

Bozeman Daily Chronicle