Emin Özsoy

Emin Özsoy
Middle East Technical University | METU · Department of Physical Oceanography

Ph.D.

About

143
Publications
40,556
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
6,534
Citations

Publications

Publications (143)
Article
Full-text available
The Bosphorus exchange is of critical importance for hydrodynamics and hydroclimatology of the Black Sea. In this study, we report on the development of a medium-resolution circulation model of the Black Sea, making use of surface atmospheric forcing with high space and time resolution, climatic river fluxes and strait exchange, enabled by adding e...
Article
Full-text available
Gravity currents are the primary means by which sediments, solutes and heat are transported across the ocean-floor. Existing theory of gravity current flow employs a statistically-stable model of turbulent diffusion that has been extant since the 1960s. Here we present the first set of detailed spatial data from a gravity current over a rough seafl...
Article
Full-text available
The Bosphorus exchange is of critical importance for hydrodynamics of the Black Sea. In this study, we report on the development of a medium resolution circulation model of the Black Sea, making use of up-to-date topography, atmospheric forcing with high space and time resolution, climatic river fluxes and strait exchange enabled by adding the Bosp...
Conference Paper
Full-text available
The operational near real time and reanalysis physical system for the Black Sea is one of the three production units of the Black Sea Monitoring and Forecasting Centre (BS-MFC). It is operationally working since October 2016 in the framework of Copernicus Marine Environment and Monitoring Service (CMEMS), producing every day 3-days analysis, 1-day...
Article
Full-text available
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 pycnocline between the upper and lower layers remains stationary after 6 years of integration, indicating that despite the l...
Article
Full-text available
An observing system simulation experiment (OSSE) is presented in the Sea of Marmara. 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 Sea of Marmara. A reference experiment without assimilation...
Article
Full-text available
The first in situ measurements of seawater density that referred to a geographical position at sea and time of the year were carried out by Count Luigi Ferdinando Marsili between 1679 and 1680 in the Adriatic Sea, Aegean Sea, Marmara Sea, and the Bosporus. Not only was this the first investigation with documented oceanographic measurements carried...
Preprint
Full-text available
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 despit...
Preprint
Full-text available
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 per...
Article
Full-text available
The Copernicus Marine Environment Monitoring Service (CMEMS) provides regular and systematic reference information on the physical state, variability and dynamics of the ocean, ice and marine ecosystems for the global ocean and the European regional seas. CMEMS includes both satellite and in-situ high level products prepared by Thematic Assembly Ce...
Article
This paper presents a review of the state-of-the-art in understanding and quantification of the Mediterranean heat and mass (i.e. salt and water) budgets. The budgets are decomposed into a basin averaged surface component, lateral boundary components (through the Gibraltar and the Dardanelles Straits), a river input component and a content change c...
Conference Paper
Full-text available
The first quantitative measurements of seawater properties were carried out by Count Luigi Ferdinando Marsili in a cruise between 1679 and 1680 in the Aegean Sea, Marmara Sea and the Bosphorus Strait. The data reported in the historical oceanographic treatise “Osservazioni intorno al Bosforo Tracio” (Marsili, 1681) allowed us to reconstruct the sea...
Article
Full-text available
High-resolution modelling, for the first time, is used to study the basic hydrodynamics of the Turkish Straits System (TSS). Hydraulic controls in the Bosphorus and Dardanelles Straits are found to be essential in determining the coupled response of the TSS, which directly influences the interaction between the Mediterranean and Black Seas. The mix...
Article
Full-text available
Mediterranean water entering the Black Sea through the Bosphorus Strait forms mid-depth intrusions that contribute to the salt, heat, and volume balances of the sea, ventilate its water column at intermediate depths and restrain the upward flux of hydrogen sulfide from deeper layers. Despite the importance for the Black Sea environment, the circula...
Article
Full-text available
The Turkish Straits System (TSS) regulates the transports of water, material and energy between the Black Sea and the Mediterranean Sea. Amidst existing environmental threats to the region surrounding Istanbul, the environmental footprint of the proposed Canal Istanbul project needs to be evaluated through methods of natural science. We take the el...
Article
The fundamental hydrodynamic behavior of the Bosphorus Strait is investigated through a numerical modeling study using alternative configurations of idealized or realistic geometry. Strait geometry and basin stratification conditions allow for hydraulic controls and are ideally suited to support the maximal-exchange regime, which determines the rat...
Article
Full-text available
A detailed field investigation of a saline gravity current in the southwest Black Sea has enabled the first complete analysis of three-dimensional flow structure and dynamics of a series of linked hydraulic jumps in stratified, density-driven, flows. These field observations were collected using an acoustic Doppler current profiler mounted on an au...
Conference Paper
Full-text available
About 300 km3 of warm saline Mediterranean-origin waters (MOW) are annually transported into the Black Sea by the lower current in the Bosphorus Strait. After passing through the Strait, saline and relatively dense MOW propagate over the shelf and descend down the continental slope, mixing with less saline and colder surrounding waters. As a result...
Conference Paper
We report on the development of a medium resolution circulation model of the Black Sea, making use of an up-to-date topographic data base, atmospheric forcing with high space and time resolution, an improved accounting of climatological river fluxes, possibility of sea-ice formation in the north. Particular attention is given to convective water ma...
Article
Full-text available
The Etesian wind regime dominating the climate of the Aegean Sea in summer often influences a larger area extending from the Balkans and the Black Sea to the Levantine Basin of the Eastern Mediterranean. The steady dry northerly winds descending from the Balkans in summer often incite forest fires in the Aegean Sea region, while the moist air picke...
Article
Full-text available
The relationship between water transport in the Aegean Sea and the North Sea Caspian Pattern (NCP) index is investigated. Calculated meridional mass transport in the Aegean Sea, a possible proxy for the Eastern Mediterranean Transient (EMT), shows significant correlation with the NCP index, especially in winter. It was found that the EMT may have h...
Article
Full-text available
The relationship between climate indices and the Caspian Sea Surface Temperature (SST) are investigated, making use of the satellite measured SST during 1985-2005. North Sea Caspian Pattern (NCP) and NINO 3.4 index are shown to have a strong influence on the SST among the studied indices, in the studied February to May period. High correlation of S...
Article
Full-text available
Migrating fish are challenged by a series of physical barriers as they pass through the Turkish Straits System (TSS) such as the strong mixing zones and blocking of water transport in the Straits. The possible influence of the Çanakkale (Dardanelles) Strait blocking on fish migration is investigated. For this purpose, a numerical ocean model of the...
Conference Paper
Full-text available
The Turkish Straits System (TSS), which regulates the transports of water, material and energy between the Black Sea and the Mediterranean Sea has a two-layer flow with contrasting properties and a unique ‘maximal exchange’ regime resulting from hydraulic controls. This sensitive system in the last century has been subjected to increased environmen...
Article
Full-text available
The development of cultures of phytoplankton adapting throughout several days in an axenic, continuous-flow chemostat to yield a steady kinetic state of competing species is described mathematically. The adaptation of the growth rate to the chemostat environment inhibits integration of the equation of conservation of phytoplankton populations, thou...
Conference Paper
Full-text available
The fundamental physics of the nonlinear behavior of fluids is briefly recalled with a discussion on particular examples frequently observed in the atmosphere and the ocean. Cases of nonlinear systems at different levels of complexity, leading from simple to coupled and disordered systems are exemplified as essential elements of the climate system....
Article
The vertical profiles of 137Cs were determined in the North Aegean, Marmara and Black Seas, to assess inventories and fluxes of the radionuclide in these basins. The inventory of 137Cs in the Western Black Sea integrated from the surface down to 400 m water depth is 3.4 ± 0.1 kBq m− 2, which is surprisingly close to the amount determined in 1988, d...
Conference Paper
Full-text available
A numerical ocean model of the Turkish Straits System (TSS) has been implemented based on the HYbrid Coordinate Ocean Model (HYCOM). Model results and satellite Sea Surface Temperature (SST) were used to understand the connection between the Dardanelles Strait outflow and wind stress during the model integration. To extent the time period beyond th...
Article
Full-text available
This paper is the outcome of a workshop held in Rome in November 2011 on the occasion of the 25th anniversary of the POEM (Physical Oceanography of the Eastern Mediterranean) program. In the workshop discussions, a number of unresolved issues were identified for the physical and biogeochemical properties of the Mediterranean Sea as a whole, i.e., c...
Chapter
Full-text available
The eastern basin of the Mediterranean is a remote area of the world ocean, the isolation of its various basins increased with distance from the Atlantic Ocean and with further constraints posed by the various straits. This chapter analyzes the deep-water characteristics independent of the changes in the upper-water column. It provides the data sou...
Conference Paper
Full-text available
Recent dramatic changes of the thermohaline circulation of the Eastern Mediterranean and the observed long-term variability of the thermohaline structure of the various sub-basins (Aegean, Adriatic, Levantine, Ionian) reveal the very sensitive character of the regional thermohaline circulation pattern. We examine deep-water variability, during the...
Data
Full-text available
The SACLANT Undersea Research Centre provides the Supreme Allied Commander Atlantic (SACLANT) with scientific; and technical assistance under the terms of its NATO charter, which entered into force on 1 February 1963. Without prejudice to this main task -and under the policy direction Of SACLANT -the Centre also renders scientific and technical ass...
Article
Full-text available
The wind and buoyancy driven seasonal circulation of the Caspian Sea is investigated for a better understanding of its basin-wide and meso-scale dynamics, mixing and transport. The model successfully reproduces the following basic elements of the circulation: the southward flowing current systems along the eastern and western coasts, the upwelling...
Article
Full-text available
The importance of the Mediterranean Sea for the world ocean has long been recognized. First, the Mediterranean sea has a profound impact on the Atlantic ocean circulation and, consequently, on the global thermohaline conveyor belt. Maps of the Mediterranean salty water tongue exiting from the Gibraltar strait at intermediate depths and spreading th...
Article
Full-text available
An all-time modelling challenge aims to establish a sound understanding of the high energy environment of the Turkish Straits System, relating to inter-basin water and material transports and their influence on the sensitive ecosystems of the adjacent seas. As a first step in this direction, well resolved, high level, physically representative pred...
Data
The complex, multi-scale dynamics of the Mediterranean Sea gives fascination to oceanographers trying to understand and predict its short or long-term behavior. Eddies, jets, meanders, wind driven currents, topographic / continental shelf waves, inertial / internal / gravity waves and sea-level oscillations add significant time and space dependence...
Chapter
Full-text available
The aim of this chapter is to introduce the main topics in the Mediterranean circulation research and to give a general description of the Mediterranean Sea variability. Its scope is to provide information that is important for a comprehensive view of the most relevant issues concerning climate, which is a coupling between atmosphere and sea. The c...
Poster
Full-text available
A web-based validation platform has been developed at the Istituto Nazionale di Geofisica e Vulcanologia (INGV) for the Near Real Time validation of the MyOcean-Mediterranean Monitoring and Forecasting Centre products (Med-MFC). A network for the collection of the in-situ observations, the nested sub-basin forecasting systems model data (provided b...
Conference Paper
Full-text available
The Eastern Mediterranean deep-water variability during the last 60 years, in relation to new water mass sources, is studied and analyzed through a comprehensive and most complete data set of temperature and salinity profiles. Decadal to multi-decadal variability is present in all sub-basins (Aegean, Adriatic, Levantine, Ionian) with the Eastern Me...
Chapter
The geostrophic circulation and distributions of the Cold Intermediate and the Mediterranean water masses along the Turkish coast of the Black Sea are described on the basis of hydrographic data collected during 1987–1989 surveys of the R/V Bilim. The regional circulation was found to consist of a meandering rim current conforming mainly on the top...
Article
Full-text available
Sea level trends and interannual variability at Antalya and Menteş tide gauges are investigated during the 1985–2001 period, quantifying the roles of atmospheric, steric and local land motion contributions. Tide gauge sea level measurements, temperature/salinity climatologies and GPS data are used in the analyses and the results are compared with t...
Conference Paper
Full-text available
In this work, an estimation of vertical eddy diffusivities and dissipation rates for the SESAME cruises is conducted. The method is based on tracing the 'genuine' overturn limits within potential density CTD profiles. The respective algorithm is applied on CTD data of the broader area encompassing the Greek Seas, the Black Sea, the Turkish Straits...
Article
Full-text available
A three-dimensional primitive equation model including sea ice thermodynamics and air-sea interaction is used to study seasonal circulation and water mass variability in the Caspian Sea under the influence of realistic mass, momentum and heat fluxes. River discharges, precipitation, radiation and wind stress are seasonally specified in the model, b...
Conference Paper
Full-text available
Operational coastal ocean forecasts are developed for the seas encircling the Anatolian peninsula (Turkey) includig the northern Levantine Sea, Black Sea and the Turkish Straits System (TSS). An observing system of real-time coastal measurements has also been developed. Operational coupled ecosystem models are also aimed, with encouraging first res...
Article
Full-text available
A three-dimensional primitive equation model including sea ice thermodynamics and air-sea interaction is used to study seasonal circulation and water mass variability in the Caspian Sea under the influence of realistic mass, momentum and heat fluxes. River discharges, precipitation , radiation and wind stress are seasonally specified in the model,...
Article
Flows between ocean and marginal sea basins are often connected by narrow channels and shallow sills. In this study, we address the effect of lateral and vertical geometric constrictions on mixing and hydraulic control. We conduct a set of numerical experiments of the lock-exchange problem in the presence of lateral and vertical contractions. Large...
Conference Paper
Full-text available
MOMA Pilot Projesi'nde, ülkemizin en hızlı gelişen stratejik alanları olan Türk Boğazlar Sistemi ve Kilikya Baseni / Çukurova Kıta Sahanlığı öncelikli bölgeler olarak ele alınmış, oluşturulması gerçekte daha uzun bir süre alacak olan 'Meteoroloji ve Oşinografi Mükemmeliyet Ağı' kapsamında, uydu ve yer gözlem sistemlerinin geliştirilmesi, mevcut sis...
Research
Full-text available
Kilikya Baseni ve Çukurova Kıta Sahanlığı kıyısal sistemi, endüstri ve nüfus artışı bakımından aşırı patlama yaşanan, insan ve doğal kaynaklı değişimlerden birinci derecede etkilenen, buna karşılık önemli ulusal kaynakları barındıran ve aynı ölçüde karmaşık atmosfer-deniz-kara etkileşimlerini içeren bir bölgedir. Karasal kaynakların beslediği kıyıs...
Article
Full-text available
While this presentation in its title aims to review the environmental and water resource impacts in the eastern Mediterranean, in the subtitle emphasis is given to the fact that regional issues are inseparably linked with the environment/climate of a greater area. The mid-latitude water bodies extending from Gibraltar eastwards to the Aral Sea can...
Article
Full-text available
The Ships Of Opportunity Program in the Mediterranean Sea was established at the end of 1999, in the framework of the Mediterranean Forecasting System – Pilot Project (MFS-PP). Many improvements have been made in data collection, transmission and management. Calibration of selected XBTs and a comparison of XBTs vs. CTDs during some research cruises...
Article
Full-text available
The Ships Of Opportunity Program in the Mediterranean Sea was established at the end of 1999, in the framework of the Mediterranean Forecasting System – Pilot Project (MFS-PP). Many improvements have been made in data collection, transmission and management. Calibration of selected XBTs and a comparison of XBTs vs. CTDs during some research cruises...
Article
Full-text available
The Cilician Basin/Shelf Model is adapted for studying the shelf circulation in the Cilician Basin – Gulf of İskenderun region of the Levantine Basin of the Eastern Mediterranean between the Turkish Mediterranean coast, Syria and the island of Cyprus. The model initial conditions and open boundary conditions are supplied by the ALERMO regional mode...
Article
Full-text available
Inclusion of mineral dust radiative effects could lead to a significant improvement in the radiation balance of numerical weather prediction models with subsequent improvements in the weather forecast itself. In this study the radiative effects of mineral dust have been fully incorporated into a regional atmospheric dust model. Dust affects the rad...