@article{fdi:010049044,
  title = {{A} mechanistic account of increasing seasonal variations in the rate of ocean uptake of anthropogenic carbon},
  author = {{G}orgues, {T}. and {A}umont, {O}livier and {R}odgers, {K}. {B}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} three-dimensional circulation model that includes a representation of anthropogenic carbon as a passive tracer is forced with climatological buoyancy and momentum fluxes. {T}his simulation is then used to compute offline the anthropogenic delta p{CO}(2) (defined as the difference between the atmospheric {CO}2 and its seawater partial pressure) trends over three decades between the years 1970 and 2000. {I}t is shown that the mean increasing trends in delta p{CO}(2) reflects an increase of the seasonal amplitude of delta p{CO}(2). {I}n particular, the ocean uptake of anthropogenic {CO}2 is decreasing (negative trends in delta p{CO}(2)) in boreal (austral) summer in the {N}orthern ({S}outhern) {H}emisphere in the subtropical gyres between 20{A} degrees {N} ({S}) and 40{A} degrees {N} ({S}). {I}n our simulation, the increased amplitude of the seasonal trends of the delta p{CO}(2) is mainly explained by the seasonal sea surface temperature ({SST}) acting on the anthropogenic increase of the dissolved inorganic carbon ({DIC}). {I}t is also shown that the seasonality of the anthropogenic {DIC} has very little effect on the decadal trends. {F}inally, an observing system for p{CO}(2) that is biased towards summer measurements may be underestimating uptake of anthropogenic {CO}2 by about 0.6 {P}g{C} yr(-1) globally over the period of the {WOCE} survey in the mid-1990s according to our simulations. {T}his bias associated with summer measurements should be expected to grow larger in time and underscores the need for surface {CO}2 measurements that resolve the seasonal cycle throughout much of the extratropical oceans.},
  keywords = {},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {7},
  numero = {8},
  pages = {2581--2589},
  ISSN = {1726-4170},
  year = {2010},
  DOI = {10.5194/bg-7-2581-2010},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049044},
}