Antarctica briefing

Research and Response

Last reviewed September 2, 2026

Antarctic science is an exercise in assembling partial views. Satellites can measure an entire ice sheet but not every process beneath it. Field instruments can observe the ice–ocean boundary directly but only in a few difficult places. Models connect those observations through physical laws and test possible futures. None is sufficient alone.

The observing system

Satellite gravity missions measure changes in ice mass. Radar and laser altimeters track elevation. Synthetic-aperture radar measures ice velocity even through cloud and polar darkness. Autonomous floats and moorings record the ocean; aircraft map bedrock hidden beneath kilometres of ice; ice cores preserve past atmospheres.

Field programs provide the fine-scale measurements needed to interpret the continental view. The International Thwaites Glacier Collaboration, for example, has combined oceanography, glaciology, geophysics, remote sensing, and modelling to study one of West Antarctica’s most consequential glacier systems. Its seven-year programme also shows why observation must continue: seawater intrusion at grounding zones and highly uneven melting beneath ice shelves are now known to matter, but are not yet fully represented in forecasts.

Models are not crystal balls

A climate or ice-sheet model is an explicit set of physical relationships, assumptions, and initial conditions. Researchers test models against historical observations, compare independent models, and run ensembles to see how outcomes change under different emissions and uncertain parameters.

The resulting range is information. A narrow range means different plausible assumptions produce similar outcomes. A wide range identifies a system or timescale in which planning must account for poorly bounded risk. A mechanism can also become less likely as models improve: recent high-resolution work has reduced concern that marine ice-cliff instability will collapse Thwaites this century, even while continued rapid ice loss remains the central projection. Uncertainty does not turn a measured trend into a guess, and revision does not mean the earlier research was pointless.

What the evidence supports

The major findings are consistent across observing systems: the climate is warming because of human greenhouse-gas emissions; Antarctica is losing ice; the Southern Ocean has absorbed a disproportionate share of human-added heat and carbon; and the severity of future change depends substantially on future emissions.

Those findings support four broad responses at different scales:

  1. reduce greenhouse-gas emissions to limit additional warming;
  2. use local sea-level scenarios—not a single global average—to plan infrastructure and communities;
  3. manage fisheries and other direct pressures so ecosystems retain more room to adapt;
  4. sustain the observations, field programs, data systems, and researchers needed to detect change early.

Science does not choose the distribution of costs or write a policy by itself. It does constrain honest choices. A response that ignores the measured direction of change is not made prudent by calling the future uncertain. Nor does acknowledging a lower estimate for one mechanism justify ignoring the larger body of evidence.

Primary sources