TY - JOUR T1 - Effects of upwelling duration and phytoplankton growth regime on dissolved oxygen levels in an idealized Iberian Peninsula upwelling system A1 - Bettencourt,João H. A1 - Rossi,Vincent A1 - Renault,Lionel A1 - Haynes,Peter A1 - Morel,Yves A1 - Garçon,Véronique AD - LEGOS, University of Toulouse, CNES, CNRS, IRD, UPS, Toulouse 31400, France AD - MIO (UM 110, UMR 7294), CNRS, Aix-Marseille Univ., Univ. Toulon, IRD, 13288, Marseille, France AD - Department of Applied Mathematics and Theoretical Physics, University of Cambridge, England AD - AD - UR - https://archimer.ifremer.fr/doc/00516/62747/ DO - 10.5194/npg-27-277-2020 N2 - We apply a coupled modelling system composed of a state-of-the-art hydrodynamical model and a low complexity biogeochemical model to an idealized Iberian Peninsula upwelling system to identify the main drivers of dissolved oxygen variability and to study its response to changes in the duration of the upwelling season and in phytoplankton growth regime. We find that the export of oxygenated waters by upwelling front turbulence is a major sink for nearshore dissolved oxygen. In our simulations of summer upwelling, when phytoplankton population is generally dominated by diatoms whose growth is largely enhanced by nutrient input, net primary production and air-sea exchange compensate dissolved oxygen depletion by offshore export over the shelf. A shorter upwelling duration causes relaxation of upwelling winds and a decrease in offshore export, resulting in a slight increase of net dissolved oxygen enrichment in the coastal region as compared to longer upwelling durations. When phytoplankton is dominated by groups less sensitive to nutrient inputs, growth rates decrease and the coastal region becomes net heterotrophic. Together with the physical sink, this lowers the net oxygenation rate of coastal waters, that remains positive only because of air-sea exchanges. These findings help disentangling the physical and biogeochemical controls of dissolved oxygen in upwelling systems and, together with projections of increased duration of upwelling seasons and phytoplankton community changes, suggest that the Iberian coastal upwelling region may become more vulnerable to hypoxia and deoxygenation. Y1 - 2020/05 PB - European Geosciences Union (EGU) JF - Nonlinear Processes In Geophysics SN - 1023-5809 VL - 27 IS - 2 SP - 277 EP - 294 ID - 62747 ER -