Lateral advection supports nitrogen export in the oligotrophic open-ocean Gulf of Mexico

Thomas B. Kelly (), Angela N. Knapp, Michael R. Landry, Karen E. Selph, Taylor A. Shropshire, Rachel K. Thomas and Michael R. Stukel
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Thomas B. Kelly: Florida State University
Angela N. Knapp: Florida State University
Michael R. Landry: Scripps Institution of Oceanography
Karen E. Selph: University of Hawaii at Manoa
Taylor A. Shropshire: Florida State University
Rachel K. Thomas: Florida State University
Michael R. Stukel: Florida State University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract In contrast to its productive coastal margins, the open-ocean Gulf of Mexico (GoM) is notable for highly stratified surface waters with extremely low nutrient and chlorophyll concentrations. Field campaigns in 2017 and 2018 identified low rates of turbulent mixing, which combined with oligotrophic nutrient conditions, give very low estimates for diffusive flux of nitrate into the euphotic zone ( 90% of open-ocean nitrogen export in the GoM. Results show that lateral transport needs to be closely considered in studies of biogeochemical balances, particularly for basins enclosed by productive coasts.

Date: 2021
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DOI: 10.1038/s41467-021-23678-9

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