Constraining marsh carbon budgets using long‐term C burial and contemporary atmospheric CO2 fluxes
MetadataShow full item record
Salt marshes are sinks for atmospheric carbon dioxide that respond to environmental changes related to sea level rise and climate. Here we assess how climatic variations affect marsh‐atmosphere exchange of carbon dioxide in the short term and compare it to long‐term burial rates based on radiometric dating. The 5 years of atmospheric measurements show a strong interannual variation in atmospheric carbon exchange, varying from −104 to −233 g C m−2 a−1 with a mean of −179 ± 32 g C m−2 a−1. Variation in these annual sums was best explained by differences in rainfall early in the growing season. In the two years with below average rainfall in June, both net uptake and Normalized Difference Vegetation Index were less than in the other three years. Measurements in 2016 and 2017 suggest that the mechanism behind this variability may be rainfall decreasing soil salinity which has been shown to strongly control productivity. The net ecosystem carbon balance was determined as burial rate from four sediment cores using radiometric dating and was lower than the net uptake measured by eddy covariance (mean: 110 ± 13 g C m−2 a−1). The difference between these estimates was significant and may be because the atmospheric measurements do not capture lateral carbon fluxes due to tidal exchange. Overall, it was smaller than values reported in the literature for lateral fluxes and highlights the importance of investigating lateral C fluxes in future studies.
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 123 (2018): 867-878, doi:10.1002/2017JG004336.
Suggested CitationJournal of Geophysical Research: Biogeosciences 123 (2018): 867-878
Showing items related by title, author, creator and subject.
Galy, Valier; France-Lanord, Christian; Beyssac, Olivier; Faure, Pierre; Kudrass, Hermann; Palhol, Fabien (2007-10-04)Continental erosion controls atmospheric carbon dioxide levels on geological timescales through silicate weathering, riverine transport and subsequent burial of organic carbon in oceanic sediments. The efficiency of ...
Schwestermann, Tobias; Eglinton, Timothy I.; Haghipour, Negar; McNichol, Ann P.; Ikehara, Ken; Strasser, Michael (Elsevier, 2021-03-24)The delivery of organic carbon (OC) to the ocean's deepest trenches in the hadal zone is poorly understood, but may be important for the carbon cycle, contain crucial information on sediment provenance and event-related ...
Lattaud, Julie; Bröder, Lisa; Haghipour, Negar; Rickli, Joerg; Giosan, Liviu; Eglinton, Timothy I. (American Geophysical Union, 2021-02-02)The Arctic is undergoing accelerated changes in response to ongoing modifications to the climate system, and there is a need for local to regional scale records of past climate variability in order to put these changes ...