A better decomposition model could make some macroalgal blue-carbon estimates less comfortable
WHAT THE EVIDENCE SAYS
A new three-parameter decomposition model replaces a constant exponential decay rate with a time-varying formulation that allows detrital photosynthesis early in the trajectory. Implemented in a Bayesian framework and tested against seven empirical macroalgal datasets, it routinely fit decomposition dynamics better than the conventional model.
WHY IT MATTERS / OUR READ
The weak signal is accounting-related: if decomposition is modeled poorly, estimates of how long exported macroalgal carbon persists can inherit systematic error. Method improvements may therefore change confidence in seaweed carbon-removal claims before any new field sequestration estimate arrives.
CAVEATS / UNCERTAINTY
This is a modeling and statistical paper, not direct evidence that macroalgal carbon sequestration has been overestimated by a specific percentage. Better fit to decomposition data does not by itself resolve transport, burial, remineralization or long-term sequestration fate.
SOURCE
Ecological Modelling · Original evidence
View original evidence ↗
A new Bayesian model allows recently detached seaweed to keep photosynthesizing before decay dominates, outperforming conventional exponential decay across seven empirical datasets.
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