Preprints
https://doi.org/10.5194/bgd-6-4527-2009
https://doi.org/10.5194/bgd-6-4527-2009
29 Apr 2009
 | 29 Apr 2009
Status: this preprint was under review for the journal BG but the revision was not accepted.

An upgraded carbon-based method to estimate the anthropogenic fraction of dissolved CO2 in the Atlantic Ocean

M. Vázquez-Rodríguez, X. A. Padin, A. F. Ríos, R. G. J. Bellerby, and F. F. Pérez

Abstract. An upgrade of classical methods to calculate the anthropogenic carbon (Cant) signal based on estimates of the preformed dissolved inorganic carbon (CT) is proposed and applied to modern Atlantic sections. The main progress has been the use of subsurface layer data (100–200 m) to reconstruct water mass formation conditions and obtain better estimates of preformed properties. This practice also eliminates the need for arbitrary zero-Cant references that are usually based on properties independent of the carbon system, like the CFC content. The long-term variability of preformed total alkalinity (AT) has been considered and the temporal variability of the air-sea CO2 disequilibrium (ΔCdis) included in the formulation. The change of ΔCdis with time has shown to have non-negligible biases on Cant estimates, producing a 4 μmol kg average decrease. The proposed φCT method produces substantial differences in the Cant inventories of the Southern Ocean and Nordic Seas (~18% of the total inventory for the Atlantic) compared with recent Cant inventories. The overall calculated Atlantic Cant inventory referenced to 1994 is 55±13 Pg C, which reconciles the estimates obtained from classical CT-based Cant calculation methods, like the ΔC*, and newly introduced approaches like the TrOCA or the TTD methods.

M. Vázquez-Rodríguez, X. A. Padin, A. F. Ríos, R. G. J. Bellerby, and F. F. Pérez
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
M. Vázquez-Rodríguez, X. A. Padin, A. F. Ríos, R. G. J. Bellerby, and F. F. Pérez
M. Vázquez-Rodríguez, X. A. Padin, A. F. Ríos, R. G. J. Bellerby, and F. F. Pérez

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