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| Levante Current | |
|---|---|
| Name | Levante Current |
| Region | Mediterranean Sea |
| Type | Eastern surface current |
| Parent | Atlantic inflow |
| Length | variable |
| Width | variable |
Levante Current The Levante Current is an eastern Mediterranean surface current that transports Atlantic-origin waters, affecting circulation, biology, and climate across the Strait of Gibraltar, Alboran Sea, Balearic Islands, Sicily Channel, and eastern basins. It interacts with features such as the Atlantic Jet, Alboran gyres, Mediterranean Outflow Water, Ionian Sea dynamics, and atmospheric systems like the Mistral and Sirocco. Observations come from platforms including the Meteoceanographic buoys, ARGO floats, satellite altimetry missions such as TOPEX/Poseidon, Jason-1, and oceanographic expeditions by institutions like National Oceanography Centre, Ifremer, CNR and Instituto Español de Oceanografía.
The Levante Current forms part of Mediterranean surface circulation connecting the Atlantic Ocean inflow at the Strait of Gibraltar with eastward transport along the southern margin, influencing the Alboran Sea, Balearic Sea, and the eastern Mediterranean Sea basins. It modulates exchanges with sub-basins including the Tyrrhenian Sea, Adriatic Sea, Aegean Sea, and the Levantine Basin, and is linked to basin-scale gyres described in works by the Mediterranean Monitoring and Forecasting Centre and programs like MEDAR and SeaDataNet. The current affects propagation of anomalies from events such as the 1969 Apollo hurricane-era climate shifts and links to longer-term oscillations like the North Atlantic Oscillation and Atlantic Multidecadal Oscillation.
Forcing arises from the net eastward pressure gradient between the Gibraltar Strait region and the eastern basins, coupled to wind systems including the Sirocco, Etesian winds, and the Levanter winds, with contributions from density contrasts produced by evaporation in the Mediterranean Sea and inflow from the Atlantic Ocean. Topographic steering by features such as the Alboran Ridge, Balearic Promontory, Sicilian Channel sill, and Hellenic Trench focuses flow, while mesoscale eddies seeded near the Alboran gyres, Balearic Front, and the Ionian gyre modulate transport. Numerical models from groups at CMCC, Barcelona Supercomputing Center, and Gulf Research Center have simulated wind stress curl, baroclinic forcing, and western boundary current adjustments that generate Levantine-like eastward jets.
The current typically appears as a surface-intensified eastern jet with speeds varying from tens of centimeters per second to over one meter per second in constrained areas near the Balearic Islands and along continental slopes. It carries waters with salinity and temperature signatures influenced by Mediterranean Outflow Water mixing, Atlantic Water properties, and seasonal heating, producing stratification interacting with the thermocline and intermediate layers like Levantic Intermediate Water. Lateral scales span tens to hundreds of kilometers; vertical structure is shaped by baroclinic shear, obstructions near the Sicilian Strait, and interaction with the Adriatic dense water plume. Remote sensing by AVHRR, MODIS, and SAR satellites has been used alongside in situ data from CTD casts, ADCP transects, and drifter arrays to map variability.
By transporting nutrients, larvae, and heat, the current influences ecosystems from coastal upwelling zones off Almería to pelagic communities near Cyprus and Crete, affecting distribution of species such as Engraulis encrasicolus and Scomber scombrus as well as planktonic assemblages monitored by programs like EuroGOOS and EMSO. It plays a role in biogeographic connectivity between western and eastern faunal provinces represented in research by Barcelona University and University of Malta, and affects bloom dynamics documented in studies around Gulf of Lion and Levantine Basin. Climatically, the current modifies sea surface temperature patterns relevant to regional phenomena like the Sirocco heat advection, and interacts with air–sea fluxes that influence indices such as the North Atlantic Oscillation and extremes examined in IPCC assessments.
Seasonal modulation is linked to shifting wind regimes—Etesian winds in summer and Mistral episodes in winter—and to episodic events like Mediterranean marine heatwaves and dense water formation in the Adriatic Sea and Aegean Sea. Interannual variability connects to teleconnections including the North Atlantic Oscillation and forcings from the Atlantic Multidecadal Oscillation and El Niño–Southern Oscillation via atmospheric circulation pathways studied by the Met Office and ECMWF. Mesoscale variability arises from eddy shedding near the Balearic Front and interactions with the Catalan Current and Iberian Poleward Current, producing pulses documented by the SONNE and Meteor research cruises.
Descriptions appeared in early hydrographic surveys by institutions like the Hydrographic Office (UK), Instituto Hidrográfico de la Marina (Spain), and nineteenth-century expeditions associated with the HMS Challenger era. The modern conceptualization developed with post‑World War II programs such as MEDOC, MATER, and later EU initiatives including MFSTEP and MyOcean. Key contributions came from researchers at Sorbonne University, University of Barcelona, Institut de Ciències del Mar, CNR ISMAR, and National Research Council (Italy), using methods spanning classical sounding, XBT profiling, and satellite altimetry from ERS-1, ENVISAT, and Sentinel-3.
The current affects shipping routes through the Strait of Gibraltar, Gulf of Valencia, and around Sicily, influencing transit times and fuel consumption for operators including Maersk, MSC, and regional ferry services like Grimaldi Lines. It alters fisheries productivity for fleets from Spain, Italy, Greece, Turkey, and Malta, with management implications for organizations such as ICCAT and regional bodies like GFCM and FAO Mediterranean programs. Coastal engineering projects, offshore energy developments by companies such as ENI and Repsol, and environmental assessments by BirdLife International and WWF account for current-driven sediment transport, pollutant dispersal, and planning for marine protected areas under frameworks like the Barcelona Convention and EU Marine Strategy Framework Directive.