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Evaluation of ocean model ventilation with CFC-11: comparison of 13 global ocean models

Evaluation of ocean model ventilation with CFC-11: comparison of 13 global ocean models
Evaluation of ocean model ventilation with CFC-11: comparison of 13 global ocean models
We compared the 13 models participating in the Ocean Carbon Model Intercomparison Project (OCMIP) with regards to their skill in matching observed distributions of CFC-11. This analysis characterizes the abilities of these models to ventilate the ocean on timescales relevant for anthropogenic CO2 uptake. We found a large range in the modeled global inventory (±30%), mainly due to differences in ventilation from the high latitudes. In the Southern Ocean, models differ particularly in the longitudinal distribution of the CFC uptake in the intermediate water, whereas the latitudinal distribution is mainly controlled by the subgrid-scale parameterization. Models with isopycnal diffusion and eddy-induced velocity parameterization produce more realistic intermediate water ventilation. Deep and bottom water ventilation also varies substantially between the models. Models coupled to a sea-ice model systematically provide more realistic AABW formation source region; however these same models also largely overestimate AABW ventilation if no specific parameterization of brine rejection during sea-ice formation is included. In the North Pacific Ocean, all models exhibit a systematic large underestimation of the CFC uptake in the thermocline of the subtropical gyre, while no systematic difference toward the observations is found in the subpolar gyre. In the North Atlantic Ocean, the CFC uptake is globally underestimated in subsurface. In the deep ocean, all but the adjoint model, failed to produce the two recently ventilated branches observed in the North Atlantic Deep Water (NADW). Furthermore, simulated transport in the Deep Western Boundary Current (DWBC) is too sluggish in all but the isopycnal model, where it is too rapid.
Models, Ocean ventilation, Transient tracers, CFC
1463-5003
89-120
Dutay, J-C.
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Bullister, J.L.
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Doney, S.C.
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Orr, J.C.
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Najjar, R.
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Caldeira, K.
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Campin, J-M.
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Drange, H.
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Follows, M.
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Gao, Y.
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Gruber, N.
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Hecht, M.W.
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Ishida, A.
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Joos, F.
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Lindsay, K.
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Madec, G.
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Maier-Reimer, E.
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Marshall, J.C.
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Matear, R.J.
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Monfray, P.
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Mouchet, A.
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Plattner, G-K.
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Sarmiento, J.
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Schlitzer, R.
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Slater, R.
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Totterdell, I.J.
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Weirig, M-F.
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Yamanaka, Y.
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Yool, A.
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Dutay, J-C.
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Bullister, J.L.
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Doney, S.C.
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Orr, J.C.
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Najjar, R.
4dea54dc-0e30-431b-b60b-5ff9d48a0eee
Caldeira, K.
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Campin, J-M.
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Drange, H.
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Follows, M.
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Gao, Y.
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Gruber, N.
fa4cf423-bdd8-43fa-8401-5b3d33308808
Hecht, M.W.
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Ishida, A.
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Joos, F.
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Lindsay, K.
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Madec, G.
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Maier-Reimer, E.
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Marshall, J.C.
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Matear, R.J.
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Monfray, P.
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Mouchet, A.
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Plattner, G-K.
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Sarmiento, J.
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Schlitzer, R.
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Slater, R.
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Totterdell, I.J.
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Weirig, M-F.
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Yamanaka, Y.
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Yool, A.
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Dutay, J-C., Bullister, J.L., Doney, S.C., Orr, J.C., Najjar, R., Caldeira, K., Campin, J-M., Drange, H., Follows, M., Gao, Y., Gruber, N., Hecht, M.W., Ishida, A., Joos, F., Lindsay, K., Madec, G., Maier-Reimer, E., Marshall, J.C., Matear, R.J., Monfray, P., Mouchet, A., Plattner, G-K., Sarmiento, J., Schlitzer, R., Slater, R., Totterdell, I.J., Weirig, M-F., Yamanaka, Y. and Yool, A. (2002) Evaluation of ocean model ventilation with CFC-11: comparison of 13 global ocean models. Ocean Modelling, 4 (2), 89-120. (doi:10.1016/S1463-5003(01)00013-0).

Record type: Article

Abstract

We compared the 13 models participating in the Ocean Carbon Model Intercomparison Project (OCMIP) with regards to their skill in matching observed distributions of CFC-11. This analysis characterizes the abilities of these models to ventilate the ocean on timescales relevant for anthropogenic CO2 uptake. We found a large range in the modeled global inventory (±30%), mainly due to differences in ventilation from the high latitudes. In the Southern Ocean, models differ particularly in the longitudinal distribution of the CFC uptake in the intermediate water, whereas the latitudinal distribution is mainly controlled by the subgrid-scale parameterization. Models with isopycnal diffusion and eddy-induced velocity parameterization produce more realistic intermediate water ventilation. Deep and bottom water ventilation also varies substantially between the models. Models coupled to a sea-ice model systematically provide more realistic AABW formation source region; however these same models also largely overestimate AABW ventilation if no specific parameterization of brine rejection during sea-ice formation is included. In the North Pacific Ocean, all models exhibit a systematic large underestimation of the CFC uptake in the thermocline of the subtropical gyre, while no systematic difference toward the observations is found in the subpolar gyre. In the North Atlantic Ocean, the CFC uptake is globally underestimated in subsurface. In the deep ocean, all but the adjoint model, failed to produce the two recently ventilated branches observed in the North Atlantic Deep Water (NADW). Furthermore, simulated transport in the Deep Western Boundary Current (DWBC) is too sluggish in all but the isopycnal model, where it is too rapid.

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Published date: 2002
Keywords: Models, Ocean ventilation, Transient tracers, CFC

Identifiers

Local EPrints ID: 6005
URI: http://eprints.soton.ac.uk/id/eprint/6005
ISSN: 1463-5003
PURE UUID: 148f7dbb-0717-4d50-a2d9-86ca0dcd387d

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Date deposited: 08 Jun 2004
Last modified: 15 Jul 2019 19:38

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Contributors

Author: J-C. Dutay
Author: J.L. Bullister
Author: S.C. Doney
Author: J.C. Orr
Author: R. Najjar
Author: K. Caldeira
Author: J-M. Campin
Author: H. Drange
Author: M. Follows
Author: Y. Gao
Author: N. Gruber
Author: M.W. Hecht
Author: A. Ishida
Author: F. Joos
Author: K. Lindsay
Author: G. Madec
Author: E. Maier-Reimer
Author: J.C. Marshall
Author: R.J. Matear
Author: P. Monfray
Author: A. Mouchet
Author: G-K. Plattner
Author: J. Sarmiento
Author: R. Schlitzer
Author: R. Slater
Author: I.J. Totterdell
Author: M-F. Weirig
Author: Y. Yamanaka
Author: A. Yool

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