@article{fdi:010086048,
  title = {{D}iazotrophy as a key driver of the response of marine net primary productivity to climate change},
  author = {{B}opp, {L}. and {A}umont, {O}livier and {K}wiatkowski, {L}. and {C}lerc, {C}. and {D}upont, {L}. and {E}the, {C}. and {G}orgues, {T}homas and {S}eferian, {R}. and {T}agliabue, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he impact of anthropogenic climate change on marine net primary production ({NPP}) is a reason for concern because changing {NPP} will have widespread consequences for marine ecosystems and their associated services. {P}rojections by the current generation of {E}arth system models have suggested decreases in global {NPP} in response to future climate change, albeit with very large uncertainties. {H}ere, we make use of two versions of the {I}nstitut {P}ierre-{S}imon {L}aplace {C}limate {M}odel ({IPSL}-{CM}) that simulate divergent {NPP} responses to similar high-emission scenarios in the 21st century and identify nitrogen fixation as the main driver of these divergent {NPP} responses. {D}ifferences in the way {N} fixation is parameterised in the marine biogeochemical component {PISCES} ({P}elagic {I}nteractions {S}cheme for {C}arbon and {E}cosystem {S}tudies) of the {IPSL}-{CM} versions lead to {N}-fixation rates that are either stable or double over the course of the 21st century, resulting in decreasing or increasing global {NPP}, respectively. {A}n evaluation of these two model versions does not help constrain future {NPP} projection uncertainties. {H}owever, the use of a more comprehensive version of {PISCES}, with variable nitrogen-to-phosphorus ratios as well as a revised parameterisation of the temperature sensitivity of {N} fixation, suggests only moderate changes in globally averaged {N} fixation in the 21st century. {T}his leads to decreasing global {NPP}, in line with the model-mean changes of a recent multi-model intercomparison. {L}astly, despite contrasting trends in {NPP}, all our model versions simulate similar and significant reductions in planktonic biomass. {T}his suggests that projected plankton biomass may be a more robust indicator than {NPP} of the potential impact of anthropogenic climate change on marine ecosystems across models.},
  keywords = {},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {19},
  numero = {17},
  pages = {4267--4285},
  ISSN = {1726-4170},
  year = {2022},
  DOI = {10.5194/bg-19-4267-2022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086048},
}