Brief
NASA study finds Arctic melt season length stabilised since 2010
The average duration of the Arctic melt season has remained steady for more than a decade, after decades of lengthening.
By Felo News Desk · Published
A NASA‑led study published on 15 October 2026 reports that while the Arctic sea‑ice melt season has lengthened dramatically since satellite monitoring began in 1979, its average duration has changed little since about 2010, according to scitechdaily.com.
What happened
The researchers examined satellite observations from 1979 through 2023 to determine when Arctic sea ice began melting each spring and when refreezing resumed in the fall. Their analysis shows the melt season is now roughly 40 days longer than in 1979, with most of that increase occurring before 2010. Since then, the season’s average length has stayed fairly steady, even though individual years still show substantial variation.
What the reports add
According to the article, the longer melt season was driven primarily by later fall freeze‑up rather than a shift toward earlier spring melt. The study links this pattern to the rapid loss of multiyear ice in the 2000s, which exposed darker ocean water that absorbs more solar heat, delaying the onset of freezing in autumn. The article notes that the rapid decline in ice thickness and extent that characterised the 2000s appears to have paused for the time being.
What was said
"Previously, there was more of this multiyear ice that didn’t melt away each summer," said Linette Boisvert, a co‑author of the study and ice scientist at NASA’s Goddard Space Flight Center. "Now that the ice is thinner and there’s less of it, there’s a lot more variability."
How it came about
The study builds on decades of satellite monitoring that have tracked the Arctic’s energy balance – the difference between incoming solar, atmospheric and oceanic heat and outgoing infrared radiation. Earlier research highlighted how the loss of bright ice and the exposure of dark seawater amplified warming, extending the melt season in the 2000s. The new analysis shows that, despite ongoing year‑to‑year fluctuations, the overall length of the melt season has plateaued since about 2010.
Key facts
- The Arctic melt season is about 40 days longer than in 1979. (scitechdaily.com)
- Most of the increase occurred before 2010; average length has steadied since then. (scitechdaily.com)
- Later fall freeze‑up, not earlier spring melt, drove the longer season. (scitechdaily.com)
- Thinner, less multiyear ice has increased variability in melt timing. (scitechdaily.com)
Sources
- [1] scitechdaily.com — originally reported as “For Decades, the Arctic Melt Season Kept Growing. Then It Stopped”
