Abstract
AbstractThe driving mechanisms behind the decadal reversal of the Ionian Sea upper layer circulation recently sparked a considerable discussion in the Mediterranean scientific community. It has been suggested that the reversal can be driven by variations in wind stress curl over the basin, baroclinic dynamics acting within the Adriatic‐Ionian System (AISys) or baroclinic dynamics driven by thermohaline properties at the AISys eastern boundary. Here we perform numerical simulations in order to assess the relative importance of remote forcings (wind stress, thermohaline fluxes, thermohaline open boundary conditions) on the vorticity and energy budget of the Ionian Sea. A mechanistic understanding of the AISys dynamics is achieved with an approach based on an increasing complexity in the model forcings and domain. Our experiments suggest that wind stress does not play a leading role in the vorticity and energy budgets of the Ionian Sea. Wind stress can reinforce or weaken the circulation but it is not able to reverse its sign. Its role becomes dominant only in the absence of inflows through the Antikythira Strait and Cretan Passage. Instead, reversals in the upper layer circulation of the Ionian Sea take place only in the presence of an active boundary on the Aegean Sea/Levantine Basin side and appear to be correlated with substantial exchanges of Availalble Potential Energy between the two basins (as observed at the end of the Eastern Mediterranean Transient). From an energetic point of view, AISys can be explained therefore only if the role of the Aegean Sea is explicitly considered.
Highlights
This chapter provides a brief introduction to the state of art on Mediterranean Thermohaline Circulation (MTHC) and the dynamics of the Adriatic-Ionian system1.1 The Mediterranean Thermohaline Circulation (MTHC)The Mediterranean Sea (Figure 1.1) is a semi-enclosed basin located at mid-latitudes between Africa and Europe communicating with the World Ocean through the narrow and shallow strait of Gibraltar [56] [61]
New experiments are planned to include as eastern boundary conditions Temperature/Salinity profiles recently available for Cretan Sea/Passage.Incoming analysis will try to clarify the role of the interannual variability of wind stress forcing in shaping the interaction processes of this multipole structure and the decadal variability of the Ionian upper layer circulation
A coarse resolution primitive equation numerical model based on the MIT general circulation model (MITgcm), is used to study the baroclinic dynamics of the Adriatic-Ionian System (AIS) in order to assess the relative importance of remote forcings on the vorticity and energy budget of the system
Summary
The Mediterranean Sea (Figure 1.1) is a semi-enclosed basin located at mid-latitudes between Africa and Europe communicating with the World Ocean through the narrow and shallow strait of Gibraltar [56] [61] It is characterized by a complex land-sea distribution and is divided in two sub-basins, namely Eastern Mediterranean (EMED) and Western Mediterranean (WMED , hereafter for the acronyms in the text refer to Table 1.1 ) communicating through the Sicily Channel [56] [61]. It is a region where oceanic processes such as Deep Waters Formation (DWF) occur at a smaller scale resulting in a basin-wide MTHC (Figure 1.2) [56] [61]. The so-formed Adriatic Deep Waters (ADW) are characterized by a temperature of T < 13.3 C , a salinity S> 38.68 psu The and σθ Ionian
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