Modeling of Hydraulically Controlled Exchange Flow in the Bosphorus Strait

Oğuz, Temel; Özsoy, Emi̇n; Latif, M. A.; Sur, Halil İbrahim; Ünlüata, Ümi̇t

doi:10.1175/1520-0485(1990)020<0945:mohcef>2.0.co;2

Cited by 137 publications

(60 citation statements)

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“…The barotropic component of the flow is computed as a function of the difference between the sea surface level of the Black Sea computed by the model at the entrance of the strait and the mean sea surface level of the Mediterranean Sea. A linearized version of the relation proposed by Oguz et al (1990) is used with the assumption that the Mediterranean sea level remains unchanged throughout the year. Also, the increased river discharge in spring and summer tends to increase the Black Sea's sea surface elevation and, thus, amplifies the water export towards the Mediterranean.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Modeling the nitrogen fluxes in the Black Sea using a 3D coupledhydrodynamical-biogeochemical model: transport versus biogeochemicalprocesses, exchanges across the shelf break and comparison of the shelf anddeep sea ecodynamics

Grégoire

Beckers

2004

Biogeosciences

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Abstract.A 6-compartment biogeochemical model of nitrogen cycling and plankton productivity has been coupled with a 3D general circulation model in an enclosed environment (the Black Sea) so as to quantify and compare, on a seasonal and annual scale, the typical internal biogeochemical functioning of the shelf and of the deep sea as well as to estimate the nitrogen and water exchanges at the shelf break. Model results indicate that the annual nitrogen net export to the deep sea roughly corresponds to the annual load of nitrogen discharged by the rivers on the shelf.The model estimated vertically integrated gross annual primary production is 130 g C m −2 yr −1 for the whole basin, 220 g C m −2 yr −1 for the shelf and 40 g C m −2 yr −1 for the central basin. In agreement with sediment trap observations, model results indicate a rapid and efficient recycling of particulate organic matter in the sub-oxic portion of the water column (60-80 m) of the open sea. More than 95% of the PON produced in the euphotic layer is recycled in the upper 100 m of the water column, 87% in the upper 80 m and 67% in the euphotic layer. The model estimates the annual export of POC towards the anoxic layer to 4 10 10 mol yr −1 . This POC is definitely lost for the system and represents 2% of the annual primary production of the open sea.

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Section: Boundary Conditionsmentioning

confidence: 99%

Modeling the nitrogen fluxes in the Black Sea using a 3D coupledhydrodynamical-biogeochemical model: transport versus biogeochemicalprocesses, exchanges across the shelf break and comparison of the shelf anddeep sea ecodynamics

Grégoire

Beckers

2004

Biogeosciences

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“…Sill depth in the Bosporus channel connecting the Mediterranean and Black Seas is variously reported to be between 28 m and 60 m depth below present sea level [Tolmazin, 1985;Oguz et al, 1990]. Our interpretation of the bathymetric chart of the Bosporus sill region presented by Oguz et al is that the sill depth is between 35 and 40 m depth; for our model we use a standard sill depth of 40 m. Prior to about 10,500 years ago, global sea level was more than 60 m below present sea level [Fairbanks, 1989] so that the Black Sea existed as a lake disconnected from the Mediterranean; it had been a lake for more than 10,000 years.…”

Section: Exchange Prior To 10000 Years Agomentioning

confidence: 99%

“…At present the Black Sea has a positive freshwater budget in that precipitation and river inflows exceed evaporation. Estimates of the net freshwater flow into the Black Sea that ultimately exits through the Bosporus range from 5400 to 12,400 m 3 s -1 [Tolmazin, 1985;Oguz, et al 1990], with the classically quoted value being 6800 m 3 s -1 [MOller, 1928]. It is thought that the water budget has remained similar over the past 20,000 years, although there may have been somewhat higher river inflows during periods of major deglaciation and perhaps somewhat higher precipitation during the monsoonal interlude 7000-9000 years ago [Bdthoux, 1993].…”

Section: Exchange Prior To 10000 Years Agomentioning

confidence: 99%

Postglacial connection of the Black Sea to the Mediterranean and its relation to the timing of sapropel formation

Lane-Serff¹,

Rohling²,

Bryden³

et al. 1997

Paleoceanography

1,041

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Abstract. The opening of the connection between the Mediterranean and Black Seas as sea level rose above the Bosporus sill has long been associated with the formation of the most recent, Holocene, sapropel deposit (S•) in the eastern Mediterranean, but the mechanism has remained elusive. We present a model for the opening of the Black Sea, based on hydraulics arguments, which demonstrates that increased freshwater flux out of the Black Sea began 500-1000 years after sea level reached sill depth and that the timescale for the increased freshwater flux that drained the freshwater reservoir of the Black Sea is about 2500-3500 years. We argue that the increased freshwater discharge out of the Black Sea would lead to decreased deep water formation and higher productivity in the surface waters in the eastern Mediterranean, two conditions generally associated with sapropel formation. The delay in increased freshwater flux after the opening of the Black Sea and the period of increased freshwater discharge appear to match the onset and duration of sapropel deposits in the eastern Mediterranean.

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“…In the southern exit of the strait, relatively higher salinity values were driven by the upper layer flow blockages resulting from the strong southerly winds, which were observed during the low air pressure conditions during the autumn and winter months (Fig 3a). Recently, the relationship between the southerly winds and low atmospheric pressure was examined in the Sea of Marmara by Book et al (2014) The upper layer salinity was always higher at the B2 station compared with the K0 due to the mixing along the strait Oğuz et al, 1990).…”

Section: Upper Layer Temperature and Salinitymentioning

confidence: 99%

Seasonal and Interannual Variability of Water Exchange in the Strait of Istanbul

Altiok

Kayişoğlu

2015

Medit. Mar. Sci.

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Temperature and salinity distribution and volume fluxes through the Strait of Istanbul were analyzed using the long-term monthly time series of temperature-salinity (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) and current profiles (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010), collected from both ends of the strait. While the annual cycle of the upper layer temperature, with the minima in February and maxima in August, reflects the influence of air temperature with a near monthly phase shift, the annual cycle of the upper layer salinity, with the lowest values observed between April and September is mostly affected by the river discharge into the Western Black Sea.

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Modeling of Hydraulically Controlled Exchange Flow in the Bosphorus Strait

Cited by 137 publications

References 0 publications

Modeling the nitrogen fluxes in the Black Sea using a 3D coupledhydrodynamical-biogeochemical model: transport versus biogeochemicalprocesses, exchanges across the shelf break and comparison of the shelf anddeep sea ecodynamics

Modeling the nitrogen fluxes in the Black Sea using a 3D coupledhydrodynamical-biogeochemical model: transport versus biogeochemicalprocesses, exchanges across the shelf break and comparison of the shelf anddeep sea ecodynamics

Postglacial connection of the Black Sea to the Mediterranean and its relation to the timing of sapropel formation

Seasonal and Interannual Variability of Water Exchange in the Strait of Istanbul

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