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Effect of submarine groundwater discharge on the coastal ocean inorganic carbon cycle

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doi: 10.4319/lo.2014.59.5.1529
Authors:Liu Qian; Charette, Matthew A.; Henderson, Paul B.; McCorkle, Daniel C.; Martin, William; Dai, Minhan
Author Affiliations:Primary:
Xiamen University, State Key Lab of Marine Environmental Science, Xiamen, China
Woods Hole Oceanographic Institution, United States
Volume Title:Limnology and Oceanography
Source:Limnology and Oceanography, 59(5), p.1529-1554. Publisher: American Society of Limnology and Oceanography, Ann Arbor, MI, United States. ISSN: 0024-3590
Publication Date:2014
Note:In English. 61 refs.; illus., incl. 7 tables, sketch map
Summary:Using radium (Ra) isotopes, we estimate that the average submarine groundwater discharge (SGD) flux (marine plus terrestrial groundwater) into the southwest Florida Shelf (SWFS) was 20 ± 10 × 107 and 18 ± 8 × 107 m3 d-1 in July and October 2009, respectively. The terrestrial groundwater flux was the same order of magnitude as the local river discharge in July 2009. Shelf-water total alkalinity (TAlk) and dissolved inorganic carbon (DIC) concentrations could not be explained by river inputs alone, suggesting a groundwater source. We estimated SGD fluxes of TAlk and DIC using the SGD flux derived from a shelf-water 226Ra budget and TAlk and DIC concentration differences between the groundwater and seawater. These fluxes were also determined by the observed TAlk : 226Ra and DIC : 226Ra relationships in the shelf water, and the 226Ra flux sustained by SGD. These TAlk and DIC fluxes were 11-71 times more than the combined input of local rivers, suggesting that SGD was the dominant source of TAlk and DIC to the SWFS during 2009. SGD is an important component of the inorganic carbon budget for the coastal ocean. Abstract Copyright (2014), , by the Association for the Sciences of Limnology and Oceanography, Inc.
Subjects:Alkaline earth metals; Alkalinity; Bathymetry; Carbon; Carbon cycle; Continental shelf; Discharge; Estuaries; Geochemical cycle; Ground water; Inorganic materials; Isotopes; Marine environment; Metals; Monthly variations; Ra-224; Ra-226; Ra-228; Radioactive isotopes; Radium; Salinity; Sea water; Sea-surface temperature; Sediments; Solutes; Submarine environment; Atlantic Ocean; Florida; Gulf Coastal Plain; Gulf of Mexico; Lee County Florida; North America; North Atlantic; Tampa Bay; United States; Box models; Caloosahatchee River estuary; Charlotte Harbor; Florida Shelf; Okatee Estuary; Ra-223; Shark River estuary; Southwestern Florida
Coordinates:N243000 N280000 W0803000 W0840000
N261500 N264800 W0811200 W0813600
Record ID:790978-7
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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