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To address for the first time the carbon budget of traditional salterns, we measured the diel, seasonal, and spatial variability of water‐air CO2‐eq fluxes (CH4 and CO2) and the Organic Carbon (OC) stock and burial rate in the sediment. Temperature, salinity, dissolved oxygen, pH and wind were assessed as potential environmental drivers of the fluxes. The saltern emitted CH4 to the atmosphere throughout the year, with no significant differences among sites or seasons. On the contrary, the saltern were a sink of CO2 in summer, autumn and winter, and a source of CO2 in spring. Water temperature was the main positively related predictor variable of CH4 fluxes, explaining 29% of their variance, whereas CO2 fluxes were significantly negatively related to the concentration of O2 and pH in the seawater and positively related to wind, which explained 66% of fluxes variance. The sedimentary and OC stocks and burial rates were not significantly different among the sampled ponds and averaged 11.9 ± 2.2 Mg OC ha− 1 and 0.011 ± 0.004 Mg OC ha− 1 yr− 1 , respectively. The carbon budget of the saltern was − 35.0 g CO2‐eq m− 2 yr− 1 , corresponding to − 1.49 Mg CO2‐eq yr− 1 for the total saltern area. This suggests that the‐salt industry may function as a carbon sink as opposed to other coastal industries such as fish and shrimp aquaculture. Future studies with additional measurements across a wider range of salterns are needed to evaluate the relevance of “white carbon.”
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American Geophysical Union (AGU)