High-frequency variability of carbon dioxide fluxes in tidal water over a temperate salt marsh

Limnology & Oceanography
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Abstract

Existing analyses of salt marsh carbon budgets rarely quantify carbon loss as CO2 through the air–water interface in inundated marshes. This study estimates the variability of partial pressure of CO2 (pCO2) and air–water CO2 fluxes over summer and fall of 2014 and 2015 using high-frequency measurements of tidal water pCO2 in a salt marsh of the U.S. northeast region. Monthly mean CO2 effluxes varied in the range of 5.4–25.6 mmol m−2 marsh d−1 (monthly median: 4.8–24.7 mmol m−2 marsh d−1) during July to November from the tidal creek and tidally-inundated vegetated platform. The source of CO2 effluxes was partitioned between the marsh and estuary using a mixing model. The monthly mean marsh-contributed CO2 effluxes accounted for a dominant portion (69%) of total CO2 effluxes in the inundated marsh, which was 3–23% (mean 13%) of the corresponding lateral flux rate of dissolved inorganic carbon (DIC) from marsh to estuary. Photosynthesis in tidal water substantially reduced the CO2 evasion, accounting for 1–86% (mean 31%) of potential CO2 evasion and 2–26% (mean 11%) of corresponding lateral transport DIC fluxes, indicating the important role of photosynthesis in controlling the air–water CO2 evasion in the inundated salt marsh. This study demonstrates that CO2 evasion from inundated salt marshes is a significant loss term for carbon that is fixed within marshes.

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Publication type Article
Publication Subtype Journal Article
Title High-frequency variability of carbon dioxide fluxes in tidal water over a temperate salt marsh
Series title Limnology & Oceanography
DOI 10.1002/lno.12409
Volume 68
Issue 9
Year Published 2023
Language English
Publisher Wiley
Contributing office(s) Woods Hole Coastal and Marine Science Center
Description 18 p.
First page 2108
Last page 2125
Country United States
State Massachusetts
City Waquoit Bay
Other Geospatial Sage Lot Pond
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