“…Several studies have investigated the drivers behind Blue Carbon storage, and it has been shown that they consist of a complex set of physical, chemical, and biological factors that vary considerably between and within systems and are highly dependent on which functional scale is assessed (e.g., spatial, temporal, species, community, ecosystem) (see e.g., Ricart et al, 2015;Röhr et al, 2016;Samper-Villarreal et al, 2016;Belshe et al, 2017a,b;Dahl, 2017;Oreska et al, 2017a;Mazarrasa et al, 2018;Röhr et al, 2018). Sediment properties such as grain size, porosity, degree of sorting, and density are largely controlled by the hydrodynamic regime where, for instance, grain size typically increases with increasing wave-and current exposure, as the higher hydrodynamic energy and short residence times do not allow finer grains to settle (Folk and Ward, 1957;Fonseca and Bell, 1998;van Keulen and Borowitzka, 2003;Mazarrasa et al, 2017).…”