NASA's PREFIRE mission maps invisible far-infrared heat loss from Earth's poles after two seasonal cycles
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NASA's PREFIRE satellites have mapped far-infrared heat loss from Earth's poles using two complete seasonal cycles of data collected since July 2024. The mission provides the first comprehensive global measurements of this invisible energy, which accounts for nearly 60% of heat leaving the planet. The data reveal starkly different seasonal patterns between the Arctic and Antarctic, even as both poles experience rapid change.
The PREFIRE Mission
NASA's PREFIRE (Polar Radiant Energy in the Far-InfraRed Experiment) consists of two CubeSats that began collecting science data in July 2024. The twin satellites measure far-infrared radiation emitted from the Arctic and Antarctic, capturing surface temperature fluctuations across all seasons. Chad Greene, a glaciologist at NASA's Jet Propulsion Laboratory, noted that the mission directly tracks the invisible heat that helps regulate Earth's climate. The animation of two full years shows temperatures pulsing from cold dark blues to warmer reds, highlighting the dramatic seasonal swings.
Polar Energy Budget
The poles serve as Earth's radiators, with atmospheric and ocean circulation carrying excess tropical heat toward them to be lost to space. Far-infrared radiation accounts for nearly 60% of the planet's outgoing longwave energy, yet it had never been comprehensively measured globally before PREFIRE. Surface temperatures and their fluctuations directly reflect the net energy balance, affecting sea ice extent and tundra conditions. The data confirm that the Arctic summer warms enough to thaw ice and permafrost, while Antarctic summer temperatures rarely rise above freezing.
Scientific Impact
PREFIRE's measurements fill a critical gap in the Earth's energy budget, enabling scientists to refine climate models and improve predictions. Tristan L'Ecuyer, principal investigator at the University of Wisconsin-Madison, said the mission makes visible an energy spectrum that influences weather systems, river flows, shipping routes, and ice sheet stability. The new data are expected to enhance forecasts relied upon by industries, national defense, and Arctic communities. By directly observing far-infrared emissions in near-real time, scientists can better understand the mechanisms driving polar amplification of climate change.
What's Next
NASA plans to integrate PREFIRE data into climate models over the coming months, potentially improving forecasts of Arctic sea ice decline and polar ice sheet stability. It remains unclear how quickly these enhanced predictions will be adopted by operational agencies and industries reliant on polar weather data.
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NASA's PREFIRE mission maps invisible far-infrared heat loss from Earth's poles after two seasonal cycles
