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Discussion papers | Copyright
https://doi.org/10.5194/os-2018-7
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 31 Jan 2018

Research article | 31 Jan 2018

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Ocean Science (OS) and is expected to appear here in due course.

Circulation of the Turkish Straits System between 2008–2013 under complete atmospheric forcings

Ali Aydoğdu1,2,3, Nadia Pinardi2,4, Emin Özsoy5,6, Gokhan Danabasoglu7, Özgür Gürses5,8, and Alicia Karspeck7 Ali Aydoğdu et al.
  • 1Science and Management of Climate Change, Ca' Foscari University of 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, Italy
  • 5Institute of Marine Sciences, Middle East Technical University, Erdemli, Turkey
  • 6Eurasia Institute of Earth Sciences, Istanbul Technical University, Turkey
  • 7National Center for Atmospheric Research, Boulder, Colorado
  • 8Alfred 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 interface layer between the upper and lower layers remains stationary after six 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 Marmara Sea. 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 Marmara Sea is found to be comparable to that of the Bosphorus inflow.

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Ali Aydoğdu et al.
Ali Aydoğdu et al.
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Short summary
A six-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 is analysed and the mean state of the system is discussed on annual averages. Volume fluxes computed throughout the simulation is 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 six-year simulation of the Turkish Straits System is presented. The simulation is performed by...
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