Water level and barometric pressure measurements in two salt marshes, Humboldt Bay, CA, 2016-2019

Water levels are an important driver of salt marsh processes. In 2016, pressure-transducing data loggers (LT Edge Model 3001, Solinst and Hobo Model U-20-001-01-Ti) and barometric-pressure loggers (Model 3001, Solinst) were deployed in two USGS study marshes (Mad River marsh and Hookton marsh) located in Humboldt Bay, CA. The loggers were placed as low in the tide frame as possible, while still maintaining access to the sensors at low tide. Sensors captured high tide water levels; but sensor elevation was too high to capture low tide water levels. Continuous measurements were collected on a 6-minute timestep. Sensor elevations were surveyed using Real-Time Kinematic GPS (Leica GS-15, Leica Geosystems, Norcross, GA, USA) and the North [...]