@article{fdi:010078124,
  title = {{E}ffects of upwelling duration and phytoplankton growth regime on dissolved-oxygen levels in an idealized {I}berian {P}eninsula upwelling system},
  author = {{B}ettencourt, {J}. and {R}ossi, {V}. and {R}enault, {L}ionel and {H}aynes, {P}. and {M}orel, {Y}. and {G}arcon, {V}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e apply a coupled modelling system composed of a state-of-the-art hydrodynamical model and a low-complexity biogeochemical model to an idealized {I}berian {P}eninsula 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 the phytoplankton growth regime. {W}e find that the export of oxygenated waters by upwelling front turbulence is a major sink for nearshore dissolved oxygen. {I}n our simulations of summer upwelling, when the phytoplankton population is generally dominated by diatoms whose growth is boosted 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 a 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. {W}hen phytoplankton is dominated by groups less sensitive to nutrient inputs, growth rates decrease, and the coastal region becomes net heterotrophic. {T}ogether with the physical sink, this lowers the net oxygenation rate of coastal waters, which remains positive only because of air-sea exchange. {T}hese findings help in 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 {I}berian coastal upwelling region may become more vulnerable to hypoxia and deoxygenation.},
  keywords = {{ATLANTIQUE} {NORD} {EST} ; {IBERIQUE} {PENINSULE}},
  booktitle = {},
  journal = {{N}onlinear {P}rocesses in {G}eophysics},
  volume = {27},
  numero = {2},
  pages = {277--294},
  ISSN = {1023-5809},
  year = {2020},
  DOI = {10.5194/npg-27-277-2020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010078124},
}