from http://www.us-ocb.org/

Marsh exports of DIC and alkalinity may have complex implications for a future, more acidified ocean. A recent study by Wang et al. (2016) published in Limnology & Oceanography combines tidal water sampling of CO2 parameters across seasons and continuous in situ measurements of biogeochemically relevant parameters and water fluxes with high-resolution modeling in an intertidal salt marsh of the U.S. northeast region. Marsh DIC export is more than two times previous estimates, and exhibits high variability over tidal and seasonal cycles, which is modulated by both marsh DIC generation and by water fluxes. It is a major term in the marsh carbon budget and translates to one of the largest carbon fluxes along the U.S. East Coast.

Figure from Wang et al. (2016).