Field physiochemical parameters including nutrient concentrations and nitrogen specific uptake rates from samples collected between 2017 and 2019 from the Arctic Ocean, California Coastal Current, and a Chesapeake Bay estuary

Nitrogen is an important macronutrient for biological growth and while research has been traditionally focused on the dissolved inorganic nitrogen pool, dissolved organic nitrogen (DON) is an important, but historically less understood source of nitrogen. This work focused on creatine, a DON metabolite recognized in human nutrition that has not been heavily studied in aquatic systems. Our research investigates the extent and rate at which aquatic organisms may uptake (use) creatine and compares those rates to other nitrogen compounds including ammonium, nitrate, urea, and amino acids. Samples were collected between 2017 and 2019 and cover three North American regions. These include the polar Arctic Ocean, the California Coastal Current (Baja), and a Chesapeake Bay estuary (York River). Included in this dataset are ambient physiochemical parameters for these systems, along with measured specific uptake rates.