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Northern Aegean Sea Hybrid Coordinate Ocean Model (NAS-HYCOM)

North Aegean general circulation


 The Northern Aegean Sea general circulation is influenced by atmospheric forcing, interaction with the Eastern Mediterranean through the Southern Aegean and interaction with the Black Sea through the Turkish Straits System. In addition, circulation and water mass characteristics are largely influenced by the complex topography: deep basins (where formation of eastern Mediterranean dense water formation takes place), shelf areas, peninsulas, numerous islands and narrow straits passages.  A large buoyancy signal is connected to the outflow of low salinity waters of Black Sea origin through the Dardanellles Strait (mofified BSW). The pathways of these waters exhibit strong seasonal and inter-annual variability and have the potential to impact the entire Northern Aegean basin and the Eastern Mediterranean at large.

 

North Aegean general circulation

DESCRIPTION:

Two experiments have taken place with the low resolution NOGAPS forcing and the high resolution SKIRON/ETA forcing (collaboration with the POSEIDON project). The NOGAPS experiment wind field (figure 5a) exhibits higher wind stress values than the finer SKIRON/ETA experiment (figure 5c).

 

In figure 5a, the wind stress values are higher, especially in the eastern part of the domain, as compared to the corresponding values of the SKIRON/ETA experiment. This difference can affect significantly the surface circulation not only locally but also in the nearby region.

The diversion in the BSW pathways between the two experiments (figures 5b and 5d) is the result of the  differences in the atmospheric forcing. In figure 5b (NOGAPS experiment), the BSW is controlled by the prevailing southward winds, moving in one branch passing south of Limnos and reaching to an anticyclone south of Thasos. In figure 5d where the wind field is not so strong (SKIRON/ETA experiment), the BSW biforcates in two branches, one  primarily wind-driven (south of Limnos, but weaker than before) and one primarily buoyancy-driven, direction anticyclonically to the north and around the island of Samothraki.


CONTACT:
Villy Kourafalou — vkourafalou@rsmas.miami.edu
Ioannis Androulidakis — iandroul@civil.auth.gr


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