@article{fdi:010037824,
  title = {{R}econciling surface ocean productivity, export fluxes and sediment composition in a global biogeochemical ocean model},
  author = {{G}ehlen, {M}. and {B}opp, {L}. and {E}rnprin, {N}. and {A}umont, {O}livier and {H}einze, {C}. and {R}aguencau, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study focuses on an improved representation of the biological soft tissue pump in the global three-dimensional biogeochemical ocean model {PISCES}. {W}e compare three parameterizations of particle dynamics: (1) the model standard version including two particle size classes, aggregation-disaggregation and prescribed sinking speed; (2) an aggregation-disaggregation model with a particle size spectrum and prognostic sinking speed; (3) a mineral ballast parameterization with no size classes, but prognostic sinking speed. {I}n addition, the model includes a description of surface sediments and organic carbon early diagenesis. {M}odel output is compared to data or data based estimates of ocean productivity, pe-ratios, particle fluxes, surface sediment bulk composition and benthic {O}-2 fluxes. {M}odel results suggest that different processes control {POC} fluxes at different depths. {I}n the wind mixed layer turbulent particle coagulation appears as key process in controlling pe-ratios. {P}arameterization (2) yields simulated pe-ratios that compare well to observations. {B}elow the wind mixed layer, {POC} fluxes are most sensitive to the intensity of zooplankton flux feeding, indicating the importance of zooplankton community composition. {A}ll model parameters being kept constant, the capability of the model to reproduce yearly mean {POC} fluxes below 2000 m and benthic oxygen demand does at first order not dependent on the resolution of the particle size spectrum. {A}ggregate formation appears essential to initiate an intense biological pump. {A}t great depth the reported close to constant particle fluxes are most likely the result of the combined effect of aggregate, formation and mineral ballasting.},
  keywords = {},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {3},
  numero = {4},
  pages = {521--537},
  ISSN = {1726-4170},
  year = {2006},
  DOI = {10.5194/bg-3-521-2006},
  URL = {https://www.documentation.ird.fr/hor/fdi:010037824},
}