An assessment of Southern Ocean water masses and sea ice during 1988–2007 in a suite of interannual CORE-II simulations.

Downes, Stephanie M., Farneti, Riccardo, Uotila, Petteri, Griffies, Stephen M., Marsland, Simon J., Bailey, David, Behrens, Erik, Bentsen, Mats, Bi, Daohua, Biastoch, Arne , Böning, Claus W. , Bozec, Alexandra, Canuto, Vittorio M., Chassignet, Eric, Danabasoglu, Gokhan, Danilov, Sergey, Diansky, Nikolay, Drange, Helge, Fogli, Pier Giuseppe, Gusev, Anatoly, Howard, Armando, Ilicak, Mehmet, Jung, Thomas, Kelley, Maxwell, Large, William G., Leboissetier, Anthony, Long, Matthew, Lu, Jianhua, Masina, Simona, Mishra, Akhilesh, Navarra, Antonio, George Nurser, A.J., Patara, Lavinia , Samuels, Bonita L., Sidorenko, Dmitry, Spence, Paul, Tsujino, Hiroyuki, Wang, Qiang and Yeager, Stephen G. (2015) An assessment of Southern Ocean water masses and sea ice during 1988–2007 in a suite of interannual CORE-II simulations. Ocean Modelling, 94 . pp. 67-94. DOI 10.1016/j.ocemod.2015.07.022.

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Abstract

We characterise the representation of the Southern Ocean water mass structure and sea ice within a suite of 15 global ocean-ice models run with the Coordinated Ocean-ice Reference Experiment Phase II (CORE-II) protocol. The main focus is the representation of the present (1988-2007) mode and intermediate waters, thus framing an analysis of winter and summer mixed layer depths; temperature, salinity, and potential vorticity structure; and temporal variability of sea ice distributions. We also consider the interannual variability over the same 20 year period. Comparisons are made between models as well as to observation-based analyses where available.

The CORE-II models exhibit several biases relative to Southern Ocean observations, including an underestimation of the model mean mixed layer depths of mode and intermediate water masses in March (associated with greater ocean surface heat gain), and an overestimation in September (associated with greater high latitude ocean heat loss and a more northward winter sea-ice extent). In addition, the models have cold and fresh/warm and salty water column biases centred near 50 degrees S. Over the 1933-2007 period, the CORE-II models consistently simulate spatially variable trends in sea-ice concentration, surface freshwater fluxes, mixed layer depths, and 200-700 in ocean heat content. In particular, sea-ice coverage around most of the Antarctic continental shelf is reduced, leading to a cooling and freshening of the near surface waters. The shoaling of the mixed layer is associated with increased surface buoyancy gain, except in the Pacific where sea ice is also influential. The models are in disagreement, despite the common CORE-II atmospheric state, in their spatial pattern of the 20-year trends in the mixed layer depth and sea-ice

Document Type: Article
Additional Information: WOS:000362016400006
Keywords: Southern Ocean; CORE-II experiments; Water masses; Sea ice; Ocean model intercomparison
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R09
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > The Future Ocean - Cluster of Excellence > FO-R11
AWI
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.ocemod.2015.07.022
ISSN: 1463-5003
Projects: Future Ocean, CLIVAR, REKLIM, DRAKKAR, EarthClim, NOTUR/NorStore, GEMINA
Date Deposited: 30 Oct 2015 10:43
Last Modified: 19 Dec 2017 12:42
URI: http://oceanrep.geomar.de/id/eprint/30121

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