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Showing content from https://doi.org/10.1111/j.1600-0889.2010.00495.x below:

Simulation and assimilation of global ocean pCO2 and air–sea CO2 fluxes using ship observations of surface ocean pCO2 in a simplified biogeochemical offline model

• Vinu Valsala
• Shamil Maksyutov

We used an offline tracer transport model, driven by reanalysis ocean currents and coupled to a simple biogeochemical model, to synthesize the surface ocean pCO₂ and air–sea CO₂ flux of the global ocean from 1996 to 2004, using a variational assimilation method. This oceanic CO₂ flux analysis system was developed at the National Institute for Environmental Studies (NIES), Japan, as part of a project that provides prior fluxes for atmospheric inversions using CO₂ measurements made from an on-board instrument attached to the Greenhouse gas Observing SATellite (GOSAT). Nearly 250 000 pCO₂ observations from the database of Takahashi et al. (2007) have been assimilated into the model with a strong constraint provide by ship-track observations while maintaining a weak constraint of 20% on global averages of monthly mean pCO₂ in regions where observations are limited. The synthesized global air–sea CO₂ flux shows a net sink of 1.48 PgC yr^-1. The Southern Ocean air–sea CO₂ flux is a sink of 0.41 PgC yr^-1. The interannual variability of synthesized CO₂ flux from the El Niño region suggests a weaker source (by an amplitude of 0.4 PgC yr^-1) during the El Niño events in 1997/1998 and 2003/2004. The assimilated air–sea CO₂ flux shows remarkable correlations with the CO₂ fluxes obtained from atmospheric inversions on interannual time-scales.

Submitted on Dec 31, 2009

Accepted on Jul 6, 2010

Published on Jan 1, 2010

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