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Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 12, 193-208, 2015
http://www.biogeosciences.net/12/193/2015/
doi:10.5194/bg-12-193-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
12 Jan 2015
Evaluating the ocean biogeochemical components of Earth system models using atmospheric potential oxygen and ocean color data
C. D. Nevison1, M. Manizza2, R. F. Keeling2, M. Kahru2, L. Bopp3, J. Dunne4, J. Tiputra5, T. Ilyina6, and B. G. Mitchell2 1University of Colorado, Boulder, Institute for Arctic and Alpine Research, Boulder, Colorado, USA
2Scripps Institution of Oceanography, La Jolla, California, USA
3IPSL/LSCE, UMR8212, CNRS-CEA-UVSQ, Gif sur Yvette, France
4National Oceanic and Atmospheric Administration/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA
5Uni Climate, Uni Research and Bjerknes Centre for Climate Research, Bergen, Norway
6Max Planck Institute for Meteorology, Hamburg, Germany
Abstract. The observed seasonal cycles in atmospheric potential oxygen (APO) at a range of mid- to high-latitude surface monitoring sites are compared to those inferred from the output of six Earth system models (ESMs) participating in the fifth phase of the Coupled Model Intercomparison Project phase 5 (CMIP5). The simulated air–sea O2 fluxes are translated into APO seasonal cycles using a matrix method that takes into account atmospheric transport model (ATM) uncertainty among 13 different ATMs. Three of the ocean biogeochemistry models tested are able to reproduce the observed APO cycles at most sites, to within the large TransCom3-era ATM uncertainty used here, while the other three generally are not. Net primary production (NPP) and net community production (NCP), as estimated from satellite ocean color data, provide additional constraints, albeit more with respect to the seasonal phasing of ocean model productivity than overall magnitude. The present analysis suggests that, of the tested ocean biogeochemistry models, the community ecosystem model (CESM) and the Geophysical Fluid Dynamics Laboratory (GFDL) ESM2M are best able to capture the observed APO seasonal cycle at both northern and southern hemispheric sites. In most models, discrepancies with observed APO can be attributed to the underestimation of NPP, deep ventilation or both in the northern oceans.
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Citation: Nevison, C. D., Manizza, M., Keeling, R. F., Kahru, M., Bopp, L., Dunne, J., Tiputra, J., Ilyina, T., and Mitchell, B. G.: Evaluating the ocean biogeochemical components of Earth system models using atmospheric potential oxygen and ocean color data, Biogeosciences, 12, 193-208, doi:10.5194/bg-12-193-2015, 2015.
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Short summary
The observed seasonal cycles in atmospheric potential oxygen (APO) at five surface monitoring sites are compared to those inferred from the air-sea O2 fluxes of six ocean biogeochemistry models. The simulated air-sea fluxes are translated into APO seasonal cycles using a matrix method that takes into account atmospheric transport model (ATM) uncertainty among 13 different ATMs. Net primary production (NPP), estimated from satellite ocean color data, is also compared to model output.
The observed seasonal cycles in atmospheric potential oxygen (APO) at five surface monitoring...
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