Dense Water Dynamics along the Strait of Sicily (Mediterranean Sea)

Astraldi, M.; Gasparini, G.P.; Gervasio, L.; Salusti, E.

doi:10.1175/1520-0485(2001)031<3457:dwdats>2.0.co;2

Cited by 74 publications

(54 citation statements)

References 14 publications

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“…The EMT affected significantly the transport over the strait: massive generation of dense waters in the Aegean during the EMT induced quite strong salinity increase in the strait, accompanied by hydraulically-dragged vein of very dense bottom water( referred to as the old Eastern Mediterranean deep water) uplifted to the upper deep layers (Astraldi et al, 2001). By applying a simple mass conservation balance model, Gasparini et al (2005) pointed out that the massive outflow of saline Eastern Mediterranean waters observed in 1992 should have been coupled with rather strong inflow of fresher-than-usual upper layer waters, to keep the mass balance in the strait.…”

Section: Adriatic Ingressions and The Emtmentioning

confidence: 99%

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

et al. 2012

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Abstract. Long-term time series of physical and chemical parameters collected between 1960 and 2010 along the Palagruža Sill transect, Middle Adriatic Sea, have been investigated in terms of average water properties and their variability. Nutrients, especially orthophosphates, reached rather high levels of concentration below the euphotic zone between 1991 and 1998, the highest levels in the investigated period. Simultaneously, the N:P ratio, which is normally higher than 25:1, decreased to values less than 16:1 in the euphotic zone, indicating a switch from typical phosphorus to nitrogen-limited preconditioning for the primary production. Higher-than-usual nutrient levels peaking in the mid1990s, coupled with lower-than-usual temperature, salinity, dissolved oxygen and pH values, are presumably related to the flow of the nutrient richer Western Mediterranean waters to the Adriatic below the euphotic layer. These waters, which keep their footprint in the N:P ratio, enter the Adriatic during the anticyclonic phase of the Bimodal Adriatic-Ionian Oscillation (BiOS), which has been uniquely strengthened by the Eastern Mediterranean Transient occurring in the early 1990s. This hypothesis should be confirmed through targeted research and modelling exercises, as it is highly relevant for the biogeochemistry of the Adriatic Sea.

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Section: Adriatic Ingressions and The Emtmentioning

confidence: 99%

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

et al. 2012

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“…11 Within the Strait of Siciliy, the LIW flows along the Sicilian slope and then strikes Sicily. 36 The flow is still affected by the Coriolis force, so that it takes its way along the Italian Peninsula and south to the European coasts. When the LIW leaves the Strait of Sicily, it turns to the right along the Sicilian coasts and flows towards the Gibraltar Strait in an anticlockwise pathway.…”

Section: The Intermediate Mediterranean Watermentioning

confidence: 99%

The circulation pattern in the Mediterranean Sea: issues for modeller consideration

El-Geziry

Bryden

2010

Journal of Operational Oceanography

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“…Falcini and Salusti (2015) presented an analytic model for the Sicily channel: vorticity and PV equations based on the stream-tube model (Smith, 1975;Killworth, 5 1977). To deal with this, they used ( , ψ) coordinate system, a modified form of that used by Astraldi et al (2001). In this frame, is the along-flow coordinate and ψ is the cross-flow coordinate (see Figure 1 in Smith, 1975).…”

Section: Vorticity and Potential Vorticity (Pv) Over The Sillmentioning

confidence: 99%

Some aspects of the deep abyssal overflow between the middle and southern basins of the Caspian Sea

Matikolaei¹,

Bidokhti²,

Shiea³

2018

Preprint

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Abstract. This study investigates the deep gravity current between the middle and southern Caspian Sea basins, caused by density difference of deep waters. Oceanographic data, numerical model and dynamic models are used to consider the structure of this Caspian Sea abyssal overflow. The CTD data are obtained from UNESCO, and the three-dimensional ocean model 15COHERENS results are used to study the abyssal currents in the southern basin of the Caspian Sea.The deep overflow is driven by the density difference mainly due to the temperature difference between the middle and southern basins especially in winter. For this reason, water sinks in high latitudes and after filling the middle basin it overflows into the southern basin. As the current passes through the Absheron Strait (or sill), we use an analytic model for the overflow gravity current with inertial effects, bottom friction and entrainment, to consider its structure. The dynamical characteristics 20 of this deep baroclinic flow are investigated with different initial and boundary conditions. The results show that after time passes, the flow adjusts itself, moving as a deepening gravity driven topographically trapped current. This flow is considered for different seasons and its velocity and width are obtained. Because of the topography of the Southern Caspian basin, the flow is trapped after the sill; thus, another simple dynamical model of the overflow, based on potential vorticity similar to that of Bidokhti and Ezam (2009) but with the bottom friction and entrainment included, is used to find the horizontal extent of the 25 outflow from the western coast. To estimate the changes of vorticity and potential vorticity of the flow over the Absheron sill, we use the method of Falcini and Salusti (2015), in this work, the effects of entrainment and friction are considered. Because of the importance of the overflow in deep water ventilation, a simple dynamical model of the boundary currents based on the shape of strait is used to estimate typical mass transport and flushing time which is found to be about 15 to 20 years for the southern basin of the Caspian Sea. This time scale is important for the possible effects on the ecosystem here of pollution due 30 to oil exploration.

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Dense Water Dynamics along the Strait of Sicily (Mediterranean Sea)

Cited by 74 publications

References 14 publications

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

Changes in the Adriatic oceanographic properties induced by the Eastern Mediterranean Transient

The circulation pattern in the Mediterranean Sea: issues for modeller consideration

Some aspects of the deep abyssal overflow between the middle and southern basins of the Caspian Sea

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