Organic and Inorganic Carbon Dynamics in a Karst Aquifer
PUBLICATIONS Journal of Geophysical Research: Biogeosciences RESEARCH ARTICLE Organic and inorganic carbon dynamics in a karst 10.1002/2013JG002350 aquifer: Santa Fe River Sink-Rise system, Key Points: north Florida, USA • Aquifer biogeochemical processes are heterogeneously distributed Jin Jin1, Andrew R. Zimmerman1, Paul J. Moore1,2, and Jonathan B. Martin1 • The subsurface is generally in C metabolic balance 1Department of Geological Sciences, University of Florida, Gainesville, Florida, USA, 2ExxonMobil Exploration Company, • Hotspots of organic matter minerali- zation and autotrophy are found Houston, Texas, USA Supporting Information: Abstract Spatiotemporal variations in dissolved organic carbon (DOC), dissolved inorganic carbon • Table S1 (DIC), major ions concentrations and other geochemical parameters including stable carbon isotopes • Table S2 δ13 • Table S3 of DIC ( CDIC), were measured in surface water and deep and shallow well water samples of the Santa • Table S4 Fe River Sink-Rise eogenetic karst system, north Florida, USA. Three end-member water sources were • Figure S1 13 13 identified: one DOC-rich/DIC-poor/δ CDIC-depleted, one DOC-poor/DIC-rich/δ CDIC-enriched, and one • Figure S2 • Figure S3 enriched in major ions. Given their spatiotemporal distributions, they were presumed to represent soil • Figure S4 water, upper aquifer groundwater, and deep aquifer water sources, respectively. Using assumed ratios of + 2À Na , Cl, and SO4 for each end-member, a mixing model calculated the contribution of each water Correspondence to: source to each sample. Then, chemical effects of biogeochemical reactions were calculated as the A. R. Zimmerman, azimmer@ufl.edu difference between those predicted by the mixing model and measured species concentrations.
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