Variations of marine plankton δ<sup>13</sup>C with latitude, temperature, and dissolved CO<sub>2</sub> in the world ocean

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書誌事項

公開日
1994-03
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/93gb03272
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Variations of the <jats:sup>13</jats:sup>C content of marine participate organic carbon (δ<jats:sup>13</jats:sup>C<jats:sub>POC</jats:sub>) in the modern ocean were studied using literature data to test the assumptions underlying the calculation of atmospheric pCO<jats:sub>2</jats:sub> through geological time from the δ<jats:sup>13</jats:sup>C of sedimentary organic matter. These assumptions are that (1) concentrations of CO<jats:sub>2</jats:sub> in the atmosphere and the surface ocean are at equilibrium at all times and latitudes and that (2) carbon isotopic fractionation of phytoplankton (ϵ<jats:sub>p</jats:sub>) covaries primarily with concentrations of dissolved molecular CO<jats:sub>2</jats:sub> ([CO<jats:sub>2</jats:sub>]<jats:sub>aq</jats:sub>). Previous studies and compilations have shown that the first assumption does not strictly hold, although [CO<jats:sub>2</jats:sub>]<jats:sub>aq</jats:sub> may be predicted with a reasonable degree of accuracy from sea surface temperature for specific regions of the world ocean. The second assumption is shown to be questionable due to the weak covariation of ϵ<jats:sub>p</jats:sub> and [CO<jats:sub>2</jats:sub>]<jats:sub>aq</jats:sub> in the modern ocean. The large residual variance for regressions of ϵp against [CO<jats:sub>2</jats:sub>]<jats:sub>aq</jats:sub> suggests that factors other than [CO<jats:sub>2</jats:sub>]<jats:sub>aq</jats:sub> strongly affect carbon isotopic fractionation in phytoplankton. It is concluded that the relationship between ϵp and [CO<jats:sub>2</jats:sub>]<jats:sub>aq</jats:sub> cannot be easily calibrated using δ<jats:sup>13</jats:sup>C<jats:sub>POC</jats:sub> data from the modern ocean.</jats:p>

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