@article{fdi:010091345,
  title = {{E}ffects of mesozooplankton growth and reproduction on plankton and organic carbon dynamics in a marine biogeochemical model},
  author = {{C}lerc, {C}. and {B}opp, {L}. and {B}enedetti, {F}. and {K}necht, {N}. and {V}ogt, {M}. and {A}umont, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{M}arine mesozooplankton play an important role for marine ecosystem functioning and global biogeochemical cycles. {T}heir size structure, varying spatially and temporally, heavily impacts biogeochemical processes and ecosystem services. {M}esozooplankton exhibit size changes throughout their life cycle, affecting metabolic rates and functional traits. {D}espite this variability, many models oversimplify mesozooplankton as a single, unchanging size class, potentially biasing carbon flux estimates. {H}ere, we include mesozooplankton ontogenetic growth and reproduction into a 3-dimensional global ocean biogeochemical model, {PISCES}-{MOG}, and investigate the subsequent effects on simulated mesozooplankton phenology, plankton distribution, and organic carbon export. {U}tilizing an ensemble of statistical predictive models calibrated with a global set of observations, we generated monthly climatologies of mesozooplankton biomass to evaluate the simulations of {PISCES}-{MOG}. {O}ur analyses reveal that the model and observation-based biomass distributions are consistent (rpearson = 0.40, total epipelagic biomass: 137 {T}g{C} from observations vs. 232 {T}g{C} in the model), with similar seasonality (later bloom as latitude increases poleward). {I}ncluding ontogenetic growth in the model induced cohort dynamics and variable seasonal dynamics across mesozooplankton size classes and altered the relative contribution of carbon cycling pathways. {Y}ounger and smaller mesozooplankton transitioned to microzooplankton in {PISCES}-{MOG}, resulting in a change in particle size distribution, characterized by a decrease in large particulate organic carbon ({POC}) and an increase in small {POC} generation. {C}onsequently, carbon export from the surface was reduced by 10%. {T}his study underscores the importance of accounting for ontogenetic growth and reproduction in models, highlighting the interconnectedness between mesozooplankton size, phenology, and their effects on marine carbon cycling. {I}ncorporating mesozooplankton growth and reproduction alters carbon cycling pathways, reducing carbon export at 100 m by 10% {C}ohort dynamics lead to significant variations in seasonal dynamics across mesozooplankton size classes without affecting export seasonality {S}tatistical predictive models demonstrate consistency between modeled and observed mesozooplankton dynamics globally},
  keywords = {zooplankton ; biological carbon pump ; ontogenetic growth ; biomass ; distribution model ; carbon export ; size-spectrum},
  booktitle = {},
  journal = {{G}lobal {B}iogeochemical {C}ycles},
  volume = {38},
  numero = {9},
  pages = {e2024{GB}008153 [ p.]},
  ISSN = {0886-6236},
  year = {2024},
  DOI = {10.1029/2024gb008153},
  URL = {https://www.documentation.ird.fr/hor/fdi:010091345},
}