Estimates of anthropogenic carbon uptake fron gour three-dimensional global ocean models

  • Orr J
  • Maier-Reimer E
  • Mikolajewicz U
 et al. 
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We have compareds imulationso f anthropogeniCc O2 in the four threedimensionaol ceanm odelst hat participatedin the first phaseo f the OceanC arbon-Cycle Model IntercomparisoPnr oject( OCMIP), as a meanst o identifyt heir majord ifferences. Simulategdlo baul ptakaeg reetso w ithin4 -19%g, ivinga rangeo f 1.854-0.3P5g Cy r- 1 for the 1980-1989 average.R egionally,t he SouthernO ceand ominatesth e present-daya ir-sea flux of anthropogeniCcO 2 in all models,w ith one third to one half of the globalu ptake occurrings outho f 30øS.T he highests imulatedto tal uptakei n the SouthernO ceanw as 70% largert hant he lowest.C omparisonw ith recentd ata-basede stimateso f anthropogenic CO2 suggesth at most of the modelss ubstantiallyo verestimates toragei n the Southern Ocean;e lsewhereth ey generallyu nderestimatset orageb y lesst han 20%. Globally,t he OCMIP modelsa ppeart o brackett he real ocean'sp resentu ptake,b asedo n comparisono f regionadla ta-basesdt imateosf a nthropogeCnOic2 a ndb omb1 4C.C olumnin ventories of bomb•4 Ch aveb ecomme ores imilatro thosefo r anthropogeCnOic2 w itht het ime that has elapsedb etweent he GeochemicaOl ceanS ectionsS tudy (1970s) and Word OceanC irculationE xperiment( 1990s) globals amplingc ampaignsO. ur ability to evaluate simulateda nthropogeniCc O2 would improvei f systematice rrorsa ssociatedw ith the data-basedes timatesc ouldb e providedr egionall

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  • James C. Orr

  • Ernst Maier-Reimer

  • Uwe Mikolajewicz

  • Patrick Monfray

  • Jorge L. Sarmiento

  • J. R. Toggweiler

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