Shelf seas represent only 10% of the World’s Ocean by area but support up to 30% of its primary production. There are few measurements of biological production at high spatial and temporal resolution in these physically and biologically dynamic systems. Here, we use dissolved oxygen to-argon (O 2 /Ar) ratios and oxygen triple isotopes in O 2 ( 16 O, 17 O, 18 O) to estimate net community production, N (O 2 /Ar), and gross O 2 p...