Vertical gas concentrations in exposed carbonate sand beach in Marathon, FL measured on Jun 6th, 2022

This project addresses carbon conversion processes in sandy beaches. To assess gas concentration gradients between the atmsphere and the beach sediment, vertical gas concentration profiles were measured below the beach sediment surface. Gas (custom probes) and temperature probes (PT100) were placed at 2.5 cm above the sediment and at -5, -15 and -25 cm below the sediment surface. Pore gas was extracted from the sediment using a syringe pump (150 ml max. volume). Gas concentrations were measured with a LI-840A. The instrument recorded CO2 concentration, (ppm) and H2O concentration, (ppt).