A massive dissolved inorganic carbon release at spring tide in a highly turbid estuary

Details A massive dissolved inorganic carbon release at spring tide in a highly turbid estuary A massive dissolved inorganic carbon release at spring tide in a highly turbid estuary

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3109316a&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 9, CiteID L09316

Mathematics

Logic

2

Oceanography: General: Estuarine Processes, Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Oceanography: Biological And Chemical: Carbon Cycling, Oceanography: Biological And Chemical: Gases, Oceanography: Biological And Chemical: Hypoxic Environments

Scientific paper

In September 2003, the highly turbid Loire estuary (France) showed drastic oxygen depletions (down to 11% of saturation), high pCO2 (up to 3740 μatm) and high CO2 fluxes (280 +/- 100 mmol.m-2.d-1). A rapid rise in Dissolved Inorganic Carbon (DIC) was observed when the tidal amplitude increased from 3.8 m to 5.8 m. In two days, average concentrations in the 0.1-25 salinity range increased by 106 +/- 17 μmol.kg-1 for DIC, by 80 +/- 14 μeq.kg-1 for Total Alkalinity (TA) and by 684 +/- 142 μatm for pCO2. In parallel, oxygen decreased by 65 +/- 12 μmol.kg-1. These changes in concentrations were attributed in majority to a massive fluid mud resuspension in the estuarine turbidity maximum. At spring tide, this DIC input was 30% higher than the river input. When averaged over the neap-spring period, resuspension contributed to only 10% of the atmospheric CO2 flux from the estuary, but to 60% to the net TA production in the estuary.

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