@article{PAR00002831,
  title = {{I}nterannual-to-decadal variability of {N}orth {A}tlantic air-sea {CO}2 fluxes},
  author = {{R}aynaud, {S}. and {A}umont, {O}livier and {R}odgers, {K}.{B}. and {Y}iou, {P}. and {O}rr, {J}.{C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he magnitude of the interannual variability of {N}orth {A}tlantic air-sea {CO}<sub>2</sub> fluxes remains uncertain. {F}luxes inferred from atmospheric inversions have large variability, whereas those simulated by ocean models have small variability. {P}art of the difference is that unlike typical atmospheric inversions, ocean models come with spatial resolution at the sub-basin scale. <br><br> {H}ere we explore sub-basin-scale spatiotemporal variability in the {N}orth {A}tlantic in one ocean model in order to better understand why the the {N}orth {A}tlantic basin may well contribute very little to the global variability of air-sea {CO}<sub>2</sub> flux. <br><br> {W}e made two simulations with a biogeochemical model coupled to a global ocean general circulation model ({OGCM}), which itself was forced by 55-year {NCEP} reanalysis fields. {I}n the first simulation, atmospheric {CO}<sub>2</sub> was maintained at the preindustrial level (278 ppmv); in the second simulation, atmospheric {CO}<sub>2</sub> followed the observed increase. {S}imulated air-sea {CO}<sub>2</sub> fluxes and associated variables were analysed with a statistical tool known as multichannel singular spectrum analysis ({MSSA}). <br><br> {W}e found that the subtropical gyre is not the largest contributor to the overall, basin-wide variability, in contrast to previous suggestions. {T}he subpolar gyre and the inter-gyre region (the transition area between subpolar and subtropical gyres) also contribute with multipolar anomalies at multiple frequencies: these tend to cancel one another in terms of the basin-wide air-sea {CO}<sub>2</sub> flux. {W}e found a strong correlation between the air-sea {CO}<sub>2</sub> fluxes and the {N}orth {A}tlantic {O}scillation ({NAO}), but only if one takes into account time lags as does {MSSA} (maximum #r$=0.64 for lags between 1 and 3 years). {T}he contribution of anthropogenic {CO}<sub>2</sub> to total variability was negligible at interannual time scales, whereas at the decadal (13-year) time scale, it increased variability by 30%.},
  keywords = {},
  booktitle = {},
  journal = {{O}cean {S}cience {D}iscussions},
  volume = {2},
  numero = {4},
  pages = {437--472},
  year = {2005},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00002831},
}