Cascading ocean basins: numerical simulations of the circulation and interbasin exchange in the Azov-Black-Marmara-Mediterranean Seas system

Stanev, Emil V.; Grashorn, Sebastian; Zhang, Yinglong Joseph

doi:10.1007/s10236-017-1071-2

Cited by 57 publications

(48 citation statements)

References 63 publications

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“…The most significant finding 25 was the nonlinear sea level response, which deviated widely from the linear response predicted by the stand-alone Bosphorus model of Sözer and Özsoy (2017a). Stanev et al (2017) approached the challenge by using an unstructured mesh model. The model covers the entire Black Sea, and is seamlessly linked to the TSS and the northern Aegean Sea with open boundaries in the south and uses realistic atmospheric forcing.…”

Section: Introductionmentioning

confidence: 99%

“…However, in a high-resolution model of the TSS, the Courant-Friedrichs-Lewy (CFL) condition (Courant et al, 1967) restricts the time step to a few seconds with explicit schemes. As a solution, Stanev et al (2017) used an implicit advection scheme for transport to handle a wide range of Courant numbers (Zhang et al, 2016) while satisfying the stability of the solution. However, the computational burden of using an implicit scheme imposed a coarser model resolution with 53 vertical levels at the deepest point of the Black Sea.…”

Section: Introductionmentioning

confidence: 99%

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

Aydoğdu

Pinardi

Özsoy

et al. 2018

Preprint

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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 5

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Aydoğdu

Pinardi

Özsoy

et al. 2018

Preprint

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“…Its dynamics plays a very important role in the interbasin exchange and inflow of the Mediterranean waters in the Black Sea [14,[60][61][62][63][64]. On the other hand, the Black Sea dynamics significantly affect the Marmara Sea ecosystem and thermohaline variability [82].…”

Section: Reconstruction Of the Marmara Sea Circulationmentioning

confidence: 99%

“…In Section 3.7 we use satellite imagery with 250 m resolution to obtain basin-scale surface currents in the small and enclosed Marmara Sea, where mapped altimetry measurements are unavailable. The Marmara Sea is the first connecting link between the Black Sea and the Atlantic Ocean and its circulation is of importance for the interbasin exchange through the Bosphorus strait [8,14,[59][60][61][62][63][64]. Observation-based data on the surface currents obtained using 4D-Var assimilation of satellite imagery give the possibility of reconstructing complex mesoscale and sub-mesoscale dynamics in the Marmara Sea.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Large- and Mesoscale Dynamics in the Black Sea Region from Satellite Imagery and Altimetry Data—A Comparison of Two Methods

2018

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Two remote sensing methods, satellite altimetry and 4D-Var assimilation of satellite imagery, are used to compute surface velocity fields in the Black Sea region. Surface currents derived from the two methods are compared for several cases with intense mesoscale and large-scale dynamics during low wind conditions. Comparison shows that the obtained results coincide well quantitatively and qualitatively. However, satellite imagery provides more reasonable results on the spatial variability of coastal dynamics than altimetry data. In particular, this is related to the reconstruction of eddy coastal dynamics, such as Black Sea near-shore anticyclones. Current streamlines in these eddies are not closed near the coast in altimetry data, which we relate to the extrapolation during mapping procedure in the absence of coastal along-track measurements. On the other hand, in offshore areas, imagery-derived currents can be underestimated due to the absence of thermal contrasts and smoothing during the procedure of the 4D-Var assimilation. Wind drift currents are another source of inconsistency, as their impact is directly observed in satellite imagery but absent in altimetry data. The advantage of the 4D-Var method for reconstructing coastal dynamics is used to compute surface currents in the Marmara Sea on the base of 250 m resolution Modis optical data. The results reveal the very complex dynamics of the basin, with a large number of mesoscale and sub-mesoscale eddies. 4D-Var assimilation of Modis imagery is used to obtain information about dynamic characteristics of these small eddies with radiuses of 4-10 km.

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“…However, integral models of the system have emerged with increasing computational capacity in recent years [Gürses et al, 2016;Sannino et al, 2017;Stanev et al, 2017].…”

Section: Introductionmentioning

confidence: 99%

OSSE for a sustainable marine observing network in the Marmara Sea

Aydoğdu

Hoar

Vukićević

et al. 2018

Preprint

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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 5 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 10 an optimal sustained marine observing network in the Marmara Sea for assimilation purposes.

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Cascading ocean basins: numerical simulations of the circulation and interbasin exchange in the Azov-Black-Marmara-Mediterranean Seas system

Cited by 57 publications

References 63 publications

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

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

Reconstructing Large- and Mesoscale Dynamics in the Black Sea Region from Satellite Imagery and Altimetry Data—A Comparison of Two Methods

OSSE for a sustainable marine observing network in the Marmara Sea

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