@article{PAR00003583,
  title = {{I}nfluence of light and temperature on the marine iron cycle : from theoretical to global modeling},
  author = {{T}agliabue, {A}. and {B}opp, {L}. and {A}umont, {O}livier and {A}rrigo, {K}. {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}ron regulates net primary production ({NPP}) in a number of ocean regions and exists in a variety of different forms in seawater, not all of which are bioavailable. {W}e used a relatively complex iron cycle model to examine variability in iron speciation as a function of irradiance/temperature and parameterize its first-order impact in a global ocean biogeochemistry model ({OBM}), which necessitated certain assumptions regarding the representation of iron chemistry. {O}verall, we find that higher irradiance (typical of shallower mixed layers) promotes the conversion of dissolved iron (d{F}e) into bioavailable forms (b{F}e) and increases b{F}e concentration by 5-53%, depending on parameter values. {T}emperature plays a secondary role in controlling b{F}e, with cold mixed layers increasing b{F}e concentrations. {F}or a given irradiance and temperature, the presence of bioavailable {F}e ligands increases b{F}e/d{F}e. {W}hen bioavailable {F}e ligands are present, then reducing the photolability, increasing the log conditional stability, or increasing the concentration of such ligands all act to increase b{F}e/d{F}e. {S}uch processes are currently not represented in global {OBM}s, where iron is typically parameterized as one pool, and we find that {NPP} can vary by >+/- 20% regionally if the impact of temperature and irradiance on b{F}e is included, even under a constant circulation. {A}dditionally, iron chemistry is important in controlling the depth over which phytoplankton iron limitation can be alleviated and the subsequent efficiency of iron-based {NPP}. {W}e also suggest organically complexed d{F}e must be bioavailable if distributions of phytoplankton biomass and macronutrients are to be reconciled with observations. {O}ur results are important in understanding the role of the irradiance/mixing regime in governing the supply of iron to phytoplankton under a changing climate. {N}ew data sets on iron speciation and rate processes will aid in refining our model.},
  keywords = {},
  booktitle = {},
  journal = {{G}lobal {B}iogeochemical {C}ycles},
  volume = {23},
  numero = {},
  pages = {{G}b2017},
  ISSN = {0886-6236},
  year = {2009},
  DOI = {10.1029/2008gb003214},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00003583},
}