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net flux important for atmospheric CO 2 , but prob. not in tropics

(Takahashi et al., 2009). net flux important for atmospheric CO 2 , but prob. not in tropics gross flux important for atmospheric D 14 C: disequilibrium isoflux (mol C ∙ ‰ yr -1 ) = DD 14 C ∙ p CO 2 ∙ k g how important were the tropics?. Diagnosing the disequilibrium isoflux

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net flux important for atmospheric CO 2 , but prob. not in tropics

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  1. (Takahashi et al., 2009) • net flux important for atmospheric CO2, but prob. not in tropics • gross flux important for atmospheric D14C: • disequilibrium isoflux (mol C ∙ ‰ yr-1) = DD14C ∙ pCO2 ∙ kg • how important were the tropics?

  2. Diagnosing the disequilibrium isoflux • start with modern (PIPN) • verify balance with cosmogenic production estimate • deglacial simulation: holding circulation constant, scale D14C map to yield rate of atmospheric D14C decline • disequilibrium isoflux (mol C ∙ ‰ yr-1) = DD14C ∙ pCO2 ∙ kg

  3. PIPN D14C estimated from GLODAP potential alkalinity using Rubin & Key (2001) method

  4. PIPN pCO2 estimated from GLODAP total – anthropogenic DIC, GLODAP Alk, and Takahashi T & S

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