Coastal upwelling air‐sea fluxes revealed in atmospheric observations of O₂/N₂, CO₂ and N₂O

We capture water column ventilation resulting from coastal upwelling in continuous records of O 2 /N 2 , CO 2 , and N 2 O at Trinidad, California. Our records reveal the gas exchange response time of the ocean to the upwelling and ensuing biological production. Satellite and buoy wind data allow extrapolation of our records to assess coastal upwelling air‐sea fluxes of O 2 and N 2 O. We improve on previous regional estimates of N 2 O flux in coastal and continental shelf region of the western U.S. We characterize the source of N 2 O as being predominately from nitrification based on the O 2 /N 2 O emissions ratio observed in our atmospheric records.