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Arctic Ocean freshwater: How robust are model simulations?

Arctic Ocean freshwater: How robust are model simulations?
Arctic Ocean freshwater: How robust are model simulations?
The Arctic freshwater (FW) has been the focus of many modeling studies, due to the potential impact of Arctic FW on the deep water formation in the North Atlantic. A comparison of the hindcasts from ten ocean-sea ice models shows that the simulation of the Arctic FW budget is quite different in the investigated models. While they agree on the general sink and source terms of the Arctic FW budget, the long-term means as well as the variability of the FW export vary among models. The best model-to-model agreement is found for the interannual and seasonal variability of the solid FW export and the solid FW storage, which also agree well with observations. For the interannual and seasonal variability of the liquid FW export, the agreement among models is better for the Canadian Arctic Archipelago (CAA) than for Fram Strait. The reason for this is that models are more consistent in simulating volume flux anomalies than salinity anomalies and volume-flux anomalies dominate the liquid FW export variability in the CAA but not in Fram Strait. The seasonal cycle of the liquid FW export generally shows a better agreement among models than the interannual variability, and compared to observations the models capture the seasonality of the liquid FW export rather well. In order to improve future simulations of the Arctic FW budget, the simulation of the salinity field needs to be improved, so that model results on the variability of the liquid FW export and storage become more robust.
0148-0227
C00D16
Jahn, A.
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Aksenov, Y.
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de Cuevas, B.A.
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de Steur, L.
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Häkkinen, S.
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Hansen, E.
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Herbaut, C.
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Houssais, M.-N.
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Karcher, M.
067f8c53-6215-4c65-8acd-859f630efa7e
Kauker, F.
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Lique, C.
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Nguyen, A.
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Pemberton, P.
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Worthen, D.
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Zhang, J.
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Jahn, A.
75299d2a-929b-48fa-ab3f-5511268cebbf
Aksenov, Y.
1d277047-06f6-4893-8bcf-c2817a9c848e
de Cuevas, B.A.
01cc697c-2832-4de6-87bf-bf9f16c1f906
de Steur, L.
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Häkkinen, S.
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Hansen, E.
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Herbaut, C.
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Houssais, M.-N.
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Karcher, M.
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Kauker, F.
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Lique, C.
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Nguyen, A.
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Pemberton, P.
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Worthen, D.
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Zhang, J.
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Jahn, A., Aksenov, Y., de Cuevas, B.A., de Steur, L., Häkkinen, S., Hansen, E., Herbaut, C., Houssais, M.-N., Karcher, M., Kauker, F., Lique, C., Nguyen, A., Pemberton, P., Worthen, D. and Zhang, J. (2012) Arctic Ocean freshwater: How robust are model simulations? Journal of Geophysical Research, 117, C00D16. (doi:10.1029/2012JC007907).

Record type: Article

Abstract

The Arctic freshwater (FW) has been the focus of many modeling studies, due to the potential impact of Arctic FW on the deep water formation in the North Atlantic. A comparison of the hindcasts from ten ocean-sea ice models shows that the simulation of the Arctic FW budget is quite different in the investigated models. While they agree on the general sink and source terms of the Arctic FW budget, the long-term means as well as the variability of the FW export vary among models. The best model-to-model agreement is found for the interannual and seasonal variability of the solid FW export and the solid FW storage, which also agree well with observations. For the interannual and seasonal variability of the liquid FW export, the agreement among models is better for the Canadian Arctic Archipelago (CAA) than for Fram Strait. The reason for this is that models are more consistent in simulating volume flux anomalies than salinity anomalies and volume-flux anomalies dominate the liquid FW export variability in the CAA but not in Fram Strait. The seasonal cycle of the liquid FW export generally shows a better agreement among models than the interannual variability, and compared to observations the models capture the seasonality of the liquid FW export rather well. In order to improve future simulations of the Arctic FW budget, the simulation of the salinity field needs to be improved, so that model results on the variability of the liquid FW export and storage become more robust.

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Published date: 2012
Organisations: Marine Systems Modelling

Identifiers

Local EPrints ID: 343016
URI: https://eprints.soton.ac.uk/id/eprint/343016
ISSN: 0148-0227
PURE UUID: 00ff3704-d8c2-408d-a919-cafa650f866a

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Date deposited: 20 Sep 2012 08:56
Last modified: 18 Jul 2017 05:25

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Contributors

Author: A. Jahn
Author: Y. Aksenov
Author: B.A. de Cuevas
Author: L. de Steur
Author: S. Häkkinen
Author: E. Hansen
Author: C. Herbaut
Author: M.-N. Houssais
Author: M. Karcher
Author: F. Kauker
Author: C. Lique
Author: A. Nguyen
Author: P. Pemberton
Author: D. Worthen
Author: J. Zhang

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