Saltmarshes are ‘significant’ carbon sinks, according to a pioneering report released today (29 March) by WWF, in partnership with Aviva, on the critical role of saltmarsh habitats around the UK in combating climate change, meeting net zero targets, and protecting coastal communities.
The ‘Importance of UK saltmarshes’ report, produced in collaboration with the UK Centre for Ecology and Hydrology and RSPB – presents findings from a ‘carbon flux tower’ funded by Aviva, the UK’s leading insurer, and installed on the Ribble Estuary in Lancashire. This marks the start of a new monitoring network providing vital data on how saltmarshes contribute to the UK’s climate goals.
The solar-powered tower continuously measures the exchange of carbon dioxide between the saltmarsh and atmosphere, capturing how much carbon is absorbed or released throughout the year. This high-frequency, real-time data reveals that saltmarshes are significant carbon sinks, with the amount absorbed during the spring and summer outweighing what is released during the autumn and winter months.
While flux towers have been used to monitor carbon in other vital habitats such as woodlands and peatlands, this is the first time a coastal habitat is being studied in this way – offering a breakthrough in understanding the carbon dynamics of saltmarshes. The insights gained will help refine national greenhouse gas estimates and shape future policy, unlocking the value of these vital coastal ecosystems.
The report also includes early findings from a new network of 48 Surface Elevation Tables across six UK sites. These monitor how saltmarshes respond to sea-level rise. Initial results show a mixed picture - some marshes are adapting, while others including North Norfolk and the Ribble, are struggling - highlighting where restoration is most urgently needed.
Posted On: 30/05/2025
More on: