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Mediterranean Thermohaline Response to Large-Scale Winter Atmospheric Forcing in a High-Resolution Ocean Model Simulation

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Abstract

Large-scale circulation anomalies over the North Atlantic and Euro-Mediterranean regions described by dominant climate modes, such as the North Atlantic Oscillation (NAO), the East Atlantic pattern (EA), the East Atlantic/Western Russian (EAWR) and the Mediterranean Oscillation Index (MOI), significantly affect interannual-to-decadal climatic and hydroclimatic variability in the Euro-Mediterranean region. However, whereas previous studies assessed the impact of such climate modes on air–sea heat and freshwater fluxes in the Mediterranean Sea, the propagation of these atmospheric forcing signals from the surface toward the interior and the abyss of the Mediterranean Sea remains unexplored. Here, we use a high-resolution ocean model simulation covering the 1979–2013 period to investigate spatial patterns and time scales of the Mediterranean thermohaline response to winter forcing from NAO, EA, EAWR and MOI. We find that these modes significantly imprint on the thermohaline properties in key areas of the Mediterranean Sea through a variety of mechanisms. Typically, density anomalies induced by all modes remain confined in the upper 600 m depth and remain significant for up to 18–24 months. One of the clearest propagation signals refers to the EA in the Adriatic and northern Ionian seas: There, negative EA anomalies are associated to an extensive positive density response, with anomalies that sink to the bottom of the South Adriatic Pit within a ~ 2-year time. Other strong responses are the thermally driven responses to the EA in the Gulf of Lions and to the EAWR in the Aegean Sea. MOI and EAWR forcing of thermohaline properties in the Eastern Mediterranean sub-basins seems to be determined by reinforcement processes linked to the persistency of these modes in multiannual anomalous states. Our study also suggests that NAO, EA, EAWR and MOI could critically interfere with internal, deep and abyssal ocean dynamics and variability in the Mediterranean Sea.

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Acknowledgements

DZ and AR conceived the study. GS provided the model data and calculated transports. EC and DZ performed the statistical analyses. All authors contributed to discussion and writing of the paper. We thank two anonymous reviewers for their constructive criticism on the original manuscript.

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  1. Department of Environmental Sciences, Informatics and Statistics, University Ca’Foscari of Venice, Via Torino 155, 30172, Mestre, Italy

    Eleonora Cusinato, Davide Zanchettin & Angelo Rubino

  2. ENEA-Climate Modelling and Impacts Laboratory, Rome, Italy

    Gianmaria Sannino

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  1. Eleonora Cusinato
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  2. Davide Zanchettin
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  3. Gianmaria Sannino
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Correspondence to Eleonora Cusinato.

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Cusinato, E., Zanchettin, D., Sannino, G. et al. Mediterranean Thermohaline Response to Large-Scale Winter Atmospheric Forcing in a High-Resolution Ocean Model Simulation. Pure Appl. Geophys. 175, 4083–4110 (2018). https://doi.org/10.1007/s00024-018-1859-0

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