What is Arctic sea ice loss and why does it matter?
Arctic sea ice loss is a poster child for climate change. It's one of the most visible indicators that our planet is warming. As sea ice melts, it can also speed up global warming through the albedo feedback effect. When the reflective white ice disappears, it exposes the darker ocean water below. This dark water absorbs more heat, which in turn accelerates the warming.
This sea ice loss is largely caused by heat flowing in from the North Atlantic, a process affected by the Atlantic Meridional Overturning Circulation (AMOC). This connection shows how changes in one part of the ocean system can have far-reaching effects across the globe.
How does sea ice loss affect the Arctic Ocean?
The impacts on the Arctic Ocean are complex and interconnected:
- Wave activity and ocean mixing: Less sea ice means more open water is exposed to the wind. This generates more waves and increases ocean mixing. However, we don't yet know if this increased mixing will be strong enough to overcome the strong layering (stratification) in the Arctic and tap into the warmer water layer that sits below the fresher surface ocean.
- Marine ecosystems: Sea ice loss allows more light to get into the ocean, which could potentially increase the growth of phytoplankton. On the other hand, ecosystems that rely on the ice will decline. Plankton blooms typically occur at the ice edge, so we're still figuring out what will happen to total productivity as the ice continues to retreat.
We also study whether Arctic sea ice loss is reversible under different climate scenarios. This helps us understand if these changes can be undone and what conditions would be needed for that.
Impact
Arctic sea ice loss has significant implications for both human communities and the wider environment:
- Coastal impacts: Less sea ice exposes coastlines to more wave action, dramatically increasing coastal erosion. The erosion of permafrost releases nutrients and heavy metals into the ocean, with a potential outflow to the North Atlantic. This could provide a new nutrient source for Atlantic ecosystems and fisheries, but toxic effects are also a real possibility. This coastal erosion also directly affects settlements on the coastline and threatens traditional ways of life.
- Maritime hazards: Thinner sea ice is more mobile. This disrupts vital ice roads and increases sea ice hazards for shipping. Mobile ice can also pile up into larger ridges, which are capable of damaging subsea cables on the seafloor and disrupting internet connections and other communications.
At the National Oceanography Centre, we're undertaking comprehensive research to understand and predict Arctic sea ice changes:
- Model development We develop sea ice models that are adapted to thinner ice conditions and include wave-ice interactions.
Through the CANARI project, we run high-resolution model projections of Arctic climate change. This helps us account for the effect of mixing on sea ice decline and examine the long-distance "teleconnection" impacts on the UK's weather and climate. - Arctic gateway monitoring
Through the BIOPOLE project, we investigate nutrient fluxes (flows) through Arctic gateways. We use both modelling and observations from NOC-developed sensors. This work helps us understand the connectivity between the Arctic and the North Atlantic. We use a whole range of tools to carry out this critical research, including marine autonomy, advanced modelling systems, specialised sensors, and our research vessels.
Research Projects on Arctic Sea Ice Loss
CANARI
BIOPOLE
What's next for Arctic sea ice research at NOC?
Our research continues to evolve as the Arctic changes. We're developing new capabilities to observe and model these changes, including:
- High-resolution modelling of Arctic sea ice using our advanced modelling systems
- Monitoring of Arctic sea ice and ocean together using autonomous platforms such as Autosub Long Range equipped with advanced sensors to observe ocean physics and biogeochemistry
- Continued development of fully coupled models for the atmosphere, ocean, waves and sea ice to make more accurate future climate projections
Understanding Arctic sea ice loss is crucial, not just for the polar regions, but for the entire planet, including the UK's weather, marine ecosystems, and coastal communities.
Publications
Arctic sea ice, ocean, and climate evolution
Bacon, Sheldon 
ORCID: https://orcid.org/0000-0002-2471-9373.
2023
Arctic sea ice, ocean, and climate evolution.
Science, 381 (6661).
946-947.
10.1126/science.adj8469
2023
Article
Record-low Antarctic sea ice in 2023 increased ocean heat loss and storms
Josey, Simon A. ORCID: https://orcid.org/0000-0002-1683-8831; Meijers, Andrew J.S. ORCID: https://orcid.org/0000-0003-3876-7736; Blaker, Adam T. ORCID: https://orcid.org/0000-0001-5454-0131; Grist, Jeremy P. ORCID: https://orcid.org/0000-0003-1068-9211; Mecking, Jennifer ORCID: https://orcid.org/0000-0002-1834-1845; Ayres, Holly C. ORCID: https://orcid.org/0000-0003-0294-7620.
2024
Record-low Antarctic sea ice in 2023 increased ocean heat loss and storms.
Nature, 636.
635-639.
10.1038/s41586-024-08368-y
2024
Article
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