Abstract
Submarine groundwater discharge: An important source of new inorganic nitrogen to coral reef ecosystems
Highlights
The relationship between nutrient dynamics and productivity in coral reef systems has received considerable attention
Over the last few decades, Moore and collaborators have pioneered the use of the quartet of naturally occurring radium (Ra) isotopes as tracers for ocean mixing and saline submarine groundwater input to coastal systems (Krest and Harvey 2003)
The use of Ra isotopes has advantages over other techniques used for quantifying submarine groundwater discharge (SGD) related fluxes, since it allows for temporal and spatial integration over the mean-life of the radionuclides (Moore 2003), and the different timescales of decay are useful as mixing tracers
Summary
The relationship between nutrient dynamics and productivity in coral reef systems has received considerable attention. Groundwater from the unconfined surficial aquifer and open-ocean samples served as end-members to allow for mixing calculations; these end-member values are averages based on repeated analyses of the end-members during different times in the tidal cycle and different seasons of the year.
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