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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
04 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).
OSSE for a sustainable marine observing network in the Marmara Sea
Ali Aydoğdu1,2,3, Timothy J. Hoar4, Tomislava Vukicevic5, Jeffrey L. Anderson4, Nadia Pinardi2,6, Alicia Karspeck4, Jonathan Hendricks4, Nancy Collins4, Francesca Macchia7, and Emin Özsoy8 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 Centre, Bergen, Norway
4National Center for Atmospheric Research, Boulder, Colorado, USA
5Office of Water Prediction, National Weather Service NOAA, USA
6Department of Physics and Astronomy, University of Bologna, Italy
7Barcelona Supercomputing Center (BSC), Barcelona, Spain
8Eurasia Institute of Earth Sciences, Istanbul Technical University, Turkey
Abstract. An observing system simulation experiment (OSSE) is presented in the Marmara Sea. A high resolution ocean circulation model (FESOM) and an ensemble data assimilation tool (DART) are coupled. The OSSE methodology is used to assess the possible impact of a ferrybox network in the eastern Marmara Sea. A reference experiment without assimilation is performed. Then, synthetic temperature and salinity observations are assimilated along the track of the ferries in the second experiment. The results suggest that a ferrybox network in the Marmara Sea may improve the forecasts significantly. The salinity and temperature errors get smaller in the upper layer of the water column. The impact of the assimilation is negligible in the lower layer due to the strong stratification. The circulation in the Marmara Sea, particularly the Bosphorus outflow, helps to propagate the error reduction towards the western basin where no assimilation is performed. Overall, the proposed ferrybox network can be a good start to design an optimal sustained marine observing network in the Marmara Sea for assimilation purposes.
Citation: Aydoğdu, A., Hoar, T. J., Vukicevic, T., Anderson, J. L., Pinardi, N., Karspeck, A., Hendricks, J., Collins, N., Macchia, F., and Özsoy, E.: OSSE for a sustainable marine observing network in the Marmara Sea, Nonlin. Processes Geophys. Discuss.,, in review, 2018.
Ali Aydoğdu et al.
Ali Aydoğdu et al.
Ali Aydoğdu et al.


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Short summary
This study presents, to our knowledge, the first data assimilation experiments in the Marmara Sea. We proposed a ferrybox network for monitoring the state of Marmara Sea and showed that assimilation of the temperature and salinity improves the forecasts in the basin. The flow of the Bosphorus helps to propagate the error reduction. The study can be taken as a step towards a marine forecasting system in the Marmara Sea which will help to improve the forecasts in the adjacent Black and Aegean Seas.
This study presents, to our knowledge, the first data assimilation experiments in the Marmara...