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Abstract. Vegetated coastal ecosystems, including tidal marshes, mangroves and seagrass meadows,are being increasingly assessed in terms of their potential for carbondioxide sequestration worldwide. However, there is a paucity of studies thathave effectively estimated the accumulation rates of sediment organic carbon( Corg ), also termed blue carbon, beyond the mere quantificationof Corg stocks. Here, we discuss the use of the 210Pb dating technique to determine the rate of Corg accumulation inthese habitats. We review the most widely used 210Pb dating modelsto assess their limitations in these ecosystems, often composed ofheterogeneous sediments with varying inputs of organic material, that aredisturbed by natural and anthropogenic processes resulting in sediment mixingand changes in sedimentation rates or erosion. Through a range ofsimulations, we consider the most relevant processes that impact the 210Pb records in vegetated coastal ecosystems and evaluate howanomalies in 210Pb specific activity profiles affect sediment and Corg accumulation rates. Our results show that the discrepancy insediment and derived Corg accumulation rates between anomalousand ideal 210Pb profiles is within 20 % if the process causingsuch anomalies is well understood. While these discrepancies might beacceptable for the determination of mean sediment and Corg accumulation rates over the last century, they may not always provide areliable geochronology or historical reconstruction. Reliable estimates of Corg accumulation rates might be difficult at sites with slowsedimentation, intense mixing and/or that are affected by multiplesedimentary processes. Additional tracers or geochemical, ecological orhistorical data need to be used to validate the 210Pb -derivedresults. The framework provided in this study can be instrumental in reducingthe uncertainties associated with estimates of Corg accumulationrates in vegetated coastal sediments.

biogeosciences

Reviews and syntheses: &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Pb-derived sediment and carbon accumulation rates in vegetated coastal ecosystems – setting the record straight