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29 Jul 2014
Status : this preprint was under review for the journal BG but the revision was not accepted.
A 1-D examination of decadal air–sea re-equilibration induced ocean surface anthropogenic CO2 accumulation: present status, changes from 1960s to 2000s, and future scenarios
W.-D. Zhai and H.-D. Zhao
Based upon the well-understood carbonate system chemistry over global ocean surface (above the wintertime thermocline and shallower than upper 100 m), we investigated potentials of wintertime ocean surface DIC (dissolved inorganic carbon) to rise in response to the decadal air–sea re-equilibration, and the corresponding anthropogenic CO2 accumulation rates. For a reference year 2000, the potentials of wintertime DIC to rise in response to the rising atmospheric CO2 mole fraction ranged from 0.28 to 0.70 μmol kg−1 ppm−1 (ppm = parts of CO2 per million dry air) over the global open ocean surface, while the global mean wintertime surface DIC increase rate was close to 1.0 μmol kg−1 yr−1 . The decadal anthropogenic CO2 accumulation rate within the surface ocean was estimated at 0.31 × 1015 g C yr−1 around the reference year 2000, accounting for a non-negligible component (likely 12 to 14%) of the recent oceanic sink for anthropogenic CO2 . From 1960s to 2000s, this rate likely increased by 47% due to the accelerated atmospheric CO2 rise. However, the ocean surface anthropogenic CO2 accumulation potential under a unit atmospheric CO2 rise may have declined by 16% during the same period.
Received: 30 May 2014 – Discussion started: 29 Jul 2014
W.-D. Zhai and H.-D. Zhao
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
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Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
W.-D. Zhai and H.-D. Zhao
W.-D. Zhai and H.-D. Zhao
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