Overview
- A peer‑reviewed analysis published in May 2026 used more than 20 years of Fram Strait sampling to identify a clear shift beginning around 2009 that led to a steady fall in nitrate in waters leaving the Arctic.
- Scientists link the nitrate drop to rapid sea‑ice loss that exposed shallow continental shelves to sunlight, which increased benthic denitrification, a sediment process that converts nitrate to nitrogen gas and removes it from the water column.
- Lower nitrate has shifted plankton communities toward smaller species, which provide less energy to support fish, seabirds and marine mammals higher in the food chain.
- Because plankton draw down carbon dioxide through photosynthesis, reduced plankton growth could weaken the Arctic Ocean’s role as a carbon sink and change regional carbon budgets.
- The study, led by the University of Edinburgh with international partners and NERC support, warns the change is unlikely to reverse and calls for targeted monitoring to track cascading effects on North Atlantic fisheries and marine populations.