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publications > paper > diurnal variation in rates of calcification and carbonate sediment dissolution in florida bay > conclusions

Diurnal Variation in Rates of Calcification and Carbonate Sediment Dissolution in Florida Bay

Conclusions

Abstract
Introduction
Methods
Results
Discussion
>Conclusions
Acknowledgments
Literature Cited
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Our measurements of carbonate sediment production based on the alkalinity anomaly technique indicated consistent diurnal trends in calcification and sediment dissolution on mud banks and the various substrate types of which basins are comprised. Diurnal variation in surface water calcification and dissolution rates in Florida Bay is linked to cycling of CO2 in the water column through photosynthesis and respiration, as indicated by inverse correlations between TA and DO, and TA and pH. Seasonal measurements of carbonate sediment production on bank tops and in basins indicated an inverse correlation between sediment production and salinity. Highest rates of calcification occurred during winter months characterized by lower water temperatures, less surface water evaporation, and lower salinities.

Sediment dissolution rates were greatest during high salinity, turbidity, or cloud cover. These results suggest that an increase in the duration or frequency of seasonal hypersalinity events and high turbidity events may decrease the retention of carbonate sediments in Florida Bay due to elevated rates of dissolution. Additional monitoring of carbonate sediment production rates over a range of high salinity and high turbidity events is required to more accurately characterize and model the longterm impact of these stressors to carbonate sedimentation and the physical and chemical structure of Florida Bay.

Estimates of long-term sediment accumulation rates based on our short-term productivity measurements are very similar to estimates of Stockman et al. (1967) after correction of our data for sediment transport from basins to mud banks. Our short-term productivity measurements account for both sediment production and dissolution, whereas Stockman et al. (1967) account for sediment production, dissolution, and sediment transport both within the bay and out of the bay. Thus, similarity between our estimates and those of Stockman et al. (1967) suggests that sediment dissolution in surface waters plays a more significant role than sediment transport in the loss of carbonate sediment from Florida Bay.

< Discussion | Acknowledgments >



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