Uptake and Storage of Anthropogenic CO2 in the Pacific Ocean Estimated Using Two Modeling Approaches |
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| Authors: | LI Yangchun and XU Yongfu |
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| Affiliation: | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | A basin-wide ocean general circulation model (OGCM) of the Pacific Ocean isemployed to estimate the uptake and storage of anthropogenic CO2 usingtwo different simulation approaches. The simulation (named BIO) makes use ofa carbon model with biological processes and full thermodynamic equations tocalculate surface water partial pressure of CO2, whereas the othersimulation (named PTB) makes use of a perturbation approach to calculatesurface water partial pressure of anthropogenic CO2. The results fromthe two simulations agree well with the estimates based on observation datain most important aspects of the vertical distribution as well as the totalinventory of anthropogenic carbon. The storage of anthropogenic carbon fromBIO is closer to the observation-based estimate than that from PTB. TheRevelle factor in 1994 obtained in BIO is generally larger than thatobtained in PTB in the whole Pacific, except for the subtropical SouthPacific. This, to large extent, leads to the difference in the surfaceanthropogenic CO2 concentration between the two runs. The relativedifference in the annual uptake between the two runs is almost constantduring the integration processes after 1850. This is probably not caused bydissolved inorganic carbon (DIC), but rather by a factor independent oftime. In both runs, the rate of change in anthropogenic CO2 fluxes withtime is consistent with the rate of change in the growth rate of atmosphericpartial pressure of CO2. |
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| Keywords: | anthropogenic CO2 biological process perturbationapproach Revelle factor flux |
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