Gas exchange rates in the tidal Hudson River using a dual tracer technique

Abstract

Throughout the experiment, vertical gradients in tracer concentration were observed. After three days of mixing, tracer concentrations in bottom samples were 0-19% greater than in surface samples. Gas transfer velocities were calculated from the temporal change in the depth averaged excess 3He/SF6 ratio from stations having maximum tracer concentrations. They ranged from 1.5 to 9.0 cm h-1 and correlated well with mean wind speed. -from Authors