Intertidal salt marshes as an important source of inorganic carbon to the coastal ocean

Limnology and Oceanography
By: , and 

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Abstract

Dynamic tidal export of dissolved inorganic carbon (DIC) to the coastal ocean from highly productive intertidal marshes and its effects on seawater carbonate chemistry are thoroughly evaluated. The study uses a comprehensive approach by combining tidal water sampling of CO2parameters across seasons, 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. Salt marshes can acidify and alkalize tidal water by injecting CO2 (DIC) and total alkalinity (TA). DIC and TA generation may also be decoupled due to differential effects of marsh aerobic and anaerobic respiration on DIC and TA. As marsh DIC is added to tidal water, the buffering capacity first decreases to a minimum and then increases quickly. Large additions of marsh DIC can result in higher buffering capacity in ebbing tide than incoming tide. Alkalization of tidal water, which mostly occurs in the summer due to anaerobic respiration, can further modify buffering capacity. Marsh exports of DIC and alkalinity may have complex implications for the future, more acidified ocean. Marsh DIC export exhibits high variability over tidal and seasonal cycles, which is modulated by both marsh DIC generation and by water fluxes. The marsh DIC export of 414 g C m−2 yr−1, based on high-resolution measurements and modeling, is more than twice the previous estimates. 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.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Intertidal salt marshes as an important source of inorganic carbon to the coastal ocean
Series title Limnology and Oceanography
DOI 10.1002/lno.10347
Volume 61
Issue 5
Year Published 2016
Language English
Publisher ASLO
Contributing office(s) Woods Hole Coastal and Marine Science Center
Description 16 p.
First page 1916
Last page 1931
Country United States
State Massachusetts
Other Geospatial Sage Lot Pond, Waquoit Bay