NASA animations show seasonal heat flows at the poles

New animations based on satellite measurements from NASA's PREFIRE mission make visible how heat is distributed across the polar regions over a two-year period. The sequences reveal pronounced seasonal variations and regional differences in the uptake and release of energy — with consequences for sea ice, permafrost and weather dynamics at high latitudes.

What the animations show

Surface temperatures rise sharply in summer and fall markedly in winter. In the Arctic, the transition zones between open water and sea ice are especially dynamic: dark, open water absorbs large amounts of solar energy in summer, while reflective and insulating ice dominates in winter. In the Antarctic, the cold, high-elevation interior of the continent shapes the pattern; seasonal contrasts are most pronounced over the surrounding oceans.

Arctic and Antarctic compared

The Arctic is an ocean-dominated system. Open water absorbs radiation, promotes melting at the edges of the pack ice and thus reinforces feedbacks that increase regional heat content. The Antarctic largely rests on a massive continent with significant elevation differences. There, the surrounding ocean and the extent of the ice sheet damp short-term temperature fluctuations. At the same time, regional heat hotspots appear, for example near sub-Antarctic islands or along currents that bring warmer water.

Why the visualizations matter

The animations map physical processes: they show where heat is stored — in the ocean, in thinning ice or in soils with thawing permafrost. Such reservoirs affect how much energy remains in the atmosphere, how quickly ice melts and which feedbacks are triggered. Example sea ice: more open water means higher absorption of solar energy, stronger warming during the melt season and delayed refreezing in autumn.

Importance for predictions and models

Detailed, spatially continuous observations help to place processes in time and space. This improves the validation and development of climate models and supports predictions of seasonal sea-ice evolution. Changes at the poles can influence large-scale atmospheric patterns, such as pressure systems and jet streams, and thereby help shape weather extremes at mid-latitudes.

Satellites complement in-situ measurements

Ground stations, research ships and buoys provide precise but spatially limited data. Satellites fill gaps by capturing large-scale patterns over extended periods. The PREFIRE recordings combine spatial continuity with temporal resolution and make it possible to track developments over long distances — for example the spread of heat along ocean currents or changes in permafrost.

Outlook

The PREFIRE animations are part of a growing data foundation for observing polar processes. Combined with in-situ measurements and improved models, mechanisms can be disentangled more precisely and forecasts sharpened. Continuous, high-resolution monitoring is central to distinguishing natural variability from long-term trends.