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Ocean Science An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 5 | Copyright
Ocean Sci., 14, 999-1019, 2018
https://doi.org/10.5194/os-14-999-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 11 Sep 2018

Research article | 11 Sep 2018

Circulation of the Turkish Straits System under interannual atmospheric forcing

Ali Aydoğdu1,2,3, Nadia Pinardi4,5, Emin Özsoy6,7, Gokhan Danabasoglu8, Özgür Gürses6,9, and Alicia Karspeck8 Ali Aydoğdu et al.
  • 1Science and Management of Climate Change, Ca' Foscari University of Venice, Venice, Italy
  • 2Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy
  • 3Nansen Environmental and Remote Sensing Center, Bergen, Norway
  • 4Department of Physics and Astronomy, University of Bologna, Bologna, Italy
  • 5Istituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy
  • 6Institute of Marine Sciences, Middle East Technical University, Erdemli, Turkey
  • 7Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey
  • 8National Center for Atmospheric Research, Boulder, CO, USA
  • 9Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Abstract. A simulation of the Turkish Straits System (TSS) using a high-resolution, three-dimensional, unstructured mesh ocean circulation model with realistic atmospheric forcing for the 2008–2013 period is presented. The depth of the pycnocline between the upper and lower layers remains stationary after 6 years of integration, indicating that despite the limitations of the modelling system, the simulation maintains its realism. The solutions capture important responses to high-frequency atmospheric events such as the reversal of the upper layer flow in the Bosphorus due to southerly severe storms, i.e. blocking events, to the extent that such storms are present in the forcing dataset. The annual average circulations show two distinct patterns in the Sea of Marmara. When the wind stress maximum is localised in the central basin, the Bosphorus jet flows to the south and turns west after reaching the Bozburun Peninsula. In contrast, when the wind stress maximum increases and expands in the north–south direction, the jet deviates to the west before reaching the southern coast and forms a cyclonic gyre in the central basin. In certain years, the mean kinetic energy in the northern Sea of Marmara is found to be comparable to that of the Bosphorus inflow.

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A 6-year simulation of the Turkish Straits System is presented. The simulation is performed by a model using unstructured triangular mesh and realistic atmospheric forcing. The dynamics and circulation of the Marmara Sea are analysed and the mean state of the system is discussed on annual averages. Volume fluxes computed throughout the simulation are presented and the response of the model to severe storms is shown. Finally, it was possible to assess the kinetic energy budget in the Marmara Sea.
A 6-year simulation of the Turkish Straits System is presented. The simulation is performed by a...
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