Recent hydrological status of the Aegean Sea derived from free drifting profilers
Аннотация
Being a semi-enclosed basin of the Mediterranean Sea, the Aegean Sea comprises a complex hydrology that plays a significant role in the hydrology of the Eastern Mediterranean Sea. Its interaction with many sub-basins, along with its contribution towards the formation of deep and intermediate water, makes it an ideal case for the study of hydrological changes in transitional areas. Since 2010, the operational monitoring of the basin has been significantly enriched due to the deployment of autonomous free-drifting profilers (Argo floats) under the framework of the newly formed Greek Argo Research Infrastructure activities. In this study the hydrological status of the area is examined for the period 2010 - 2017 using the temperature and salinity profiles acquired from Argo floats that operated in the basin. The profiles are analyzed together with complementary remote sensing and model outputs datasets in order to present the spatio-temporal distribution of the co-existent water masses and shed light on hydrological features and changes that took place throughout the basin in an attempt to reassess its hydrological status during the last decade. The distribution of the physical properties in different sub-regions and their interaction is examined reconstructing a general picture of strong latitudinal gradients in the T-S and σθ fields from the upper layers towards the deeper zones. Interannually, findings indicate changes of the Aegean water masses structure within the water-column. Deep homogenization in the upper layers is recorded mainly during the winter periods of 2011-2012, 2014-2015 and 2016-2017 in the southern, central, and northern parts of the area accordingly. The observed dense water formation events, along with mixing and advection appear to alterate the water column physical properties structure and affect the dynamics of the surface and sub-surface dominant water masses in the Aegean. The results further highlight the valuable information that can be extracted from the operation of free-drifting profilers in enclosed marginal seas similar to the Aegean case.
Article Details
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KASSIS, D., & KORRES, G. (2021). Recent hydrological status of the Aegean Sea derived from free drifting profilers. Mediterranean Marine Science, 22(2), 347–361. https://doi.org/10.12681/mms.24833
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- Том 22 № 2 (2021)
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- Research Article
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Библиографические ссылки
Androulidakis, Y.S., Kourafalou, V.H., 2011. Evolution of a buoyant outflow in the presence of complex topography: The Dardanelles plume (North Aegean Sea), Journal of Geophysical Research: Oceans, 116, C04019.
Androulidakis, Y.S., Krestenitis, Y.N., Kourafalou, V. H., 2012a. Connectivity of North Aegean circulation to the Black Sea water budget. Continental Shelf Research, 48, 8-26.
Androulidakis, Y.S., Kourafalou, V.H., Krestenitis, Y.N., Zervakis, V., 2012b. Variability of deep water mass characteristics in the North Aegean Sea: The role of lateral inputs and atmospheric conditions. Deep Sea Research Part I: Oceanographic Research Papers, 67, 55-72.
de Boyer Montégut, C., Madec, G., Fischer, A.S., Lazar, A., Iudicone, D., 2004. Mixed layer depth over the global ocean: An examination of profile data and a profile-based climatology. Journal of Geophysical Research: Oceans, 109 (C12), C12003.
Cardin, V., Civitarese, G., Hainbucher, D., Bensi, M., Rubino, A., 2015. Thermohaline properties in the Eastern Mediterranean in the last three decades: is the basin returning to the pre-EMT situation? Ocean Science, 11 (1), 53-66.
Escudier, R., Clementi, E., Omar, M., Cipollone, A., Pistoia, J. et al., 2020. Mediterranean Sea Physical Reanalysis (CMEMS MED-Currents) (Version 1) [Data set]. Copernicus Monitoring Environment Marine Service (CMEMS).
Kassis, D., Korres, G., 2020. Hydrography of the Eastern Mediterranean basin derived from argo floats profile data. Deep Sea Research Part II Topical Studies Oceanography, 171, 104712.
Kassis, D., Korres, G., Petihakis, G., Perivoliotis, L., 2015. Hydrodynamic variability of the Cretan Sea derived from Argo float profiles and multi-parametric buoy measurements during 2010-2012. Ocean Dynamics, 65 (12), 1585-1601.
Kassis, D., Krasakopoulou, E., Korres, G., Petihakis, G., Triantafyllou, G.S., 2016. Hydrodynamic features of the South Aegean Sea as derived from Argo T/S and dissolved oxygen profiles in the area. Ocean Dynamics, 1-18.
Kassis, D., Korres, G., Konstantinidou, A., Perivoliotis, L., 2017. Comparison of high resolution hydrodynamic model outputs with in-situ Argo profiles in the Ionian Sea. Mediterranean Marine Science, 18 (1), 22-37.
Klein, B., Roether, W., Manca, B.B., Bregant, D., Beitzel, V. et al., 1999. The large deep water transient in the Eastern Mediterranean. Deep Sea Research Part I: Oceanographic Research Papers, 46 (3), 371-414.
Kourafalou, V.H., Barbopoulos, K., 2003. High resolution simulations on the North Aegean Sea seasonal circulation. Annales Geophysicae, 21 (1), 251-265.
Kress, N., Gertman, I., Herut, B., 2014. Temporal evolution of physical and chemical characteristics of the water column in the Easternmost Levantine basin (Eastern Mediterranean Sea) from 2002 to 2010. Journal of Marine Systems, 135, 6-13.
Lascaratos, A., Williams, R.G., Tragou, E., 1993. A mixed-layer study of the formation of Levantine intermediate water. Journal of Geophysical Research Oceans 98, 14739-14749.
Lascaratos, A., Roether, W., Nittis, K., Klein, B., 1999. Recent changes in deep water formation and spreading in the eastern Mediterranean Sea: a review. Progress in Oceanography, 44 (1-3), 5-36.
Malanotte-Rizzoli, P., Manca, B.B., d’Alcala, M.R., Theocharis, A., Brenner, S. et al., 1999. The Eastern Mediterranean in the 80s and in the 90s: the big transition in the intermediate and deep circulations. Dynamics of Atmospheres and Oceans, 29 (2-4), 365-395.
Marshall, J., Schott, F., 1999. Open-ocean convection: Observations, theory, and models. Reviews of Geophysics, 37 (1), 1-64.
Nardelli, B.B., Tronconi, C., Pisano, A., Santoleri, R., 2013. High and Ultra-High resolution processing of satellite Sea Surface Temperature data over Southern European Seas in the framework of MyOcean project. Remote Sensing of Environment, 129, 1-16.
Ozer, T., Gertman, I., Kress, N., Silverman, J., Herut, B., 2017. Interannual thermohaline (1979-2014) and nutrient (2002– 2014) dynamics in the Levantine surface and intermediate water masses, SE Mediterranean Sea. Global and Planetary Change, 151, 60-67.
Pisano, A., Nardelli, B.B., Tronconi, C., Santoleri, R., 2016. The new Mediterranean optimally interpolated pathfinder AVHRR SST Dataset (1982-2012). Remote Sensing of Environment, 176, 107-116.
Poulain, P., Barbanti, R., Font, J., Cruzado, A., Millot, C. et al., 2007. MedArgo: a drifting profiler program in the Mediterranean Sea. Ocean Science, 3 (3), 379-395.
Riser, S.C., Freeland, H.J., Roemmich, D., Wijffels, S., Troisi, A. et al., 2016. Fifteen years of ocean observations with the global Argo array. Nature Climate Change, 6, 145-153.
Roether, W., Manca, B.B., Klein, B., Bregant, D., Georgopoulos, D. et al., 1996. Recent Changes in Eastern Mediterranean Deep Waters. Science, 271 (5247), 333-335.
Roether, W., Klein, B., Manca, B.B., Theocharis, A., Kioroglou, S., 2007. Transient Eastern Mediterranean deep waters in response to the massive dense-water output of the Aegean Sea in the1990s. Progress in Oceanography, 74 (4), 540-571.
Schroeder, K., Millot, C., Bengara, L., Ben Ismail, S., Bensi, M. et al., 2013. Long-term monitoring programme of the hydrological variability in the Mediterranean Sea: a first overview of the HYDROCHANGES network. Ocean Science, 9 (2), 301-324.
Schroeder, K., Chiggiato, J., Josey, S.A., Borghini, M., Aracri, S. et al., 2017. Rapid response to climate change in a marginal sea. Scientific Reports, 7 (1), 4065.
Skliris, N., 2014. Past, Present and Future Patterns of the Thermohaline Circulation and Characteristic Water Masses of the Mediterranean Sea. In The Mediterranean Sea. Springer, Dordrecht, pp. 29-48. Available at: https://link.springer. com/chapter/10.1007/978-94-007-6704-1_3 [Accessed July 23, 2018].
Theocharis, A., Georgopoulos, D., Lascaratos, A., Nittis, K., 1993. Water masses and circulation in the central region of the Eastern Mediterranean: Eastern Ionian, South Aegean and Northwest Levantine, 1986-1987. Deep Sea Research Part II: Topical Studies in Oceanography, 40 (6), 1121- 1142.
Theocharis, A., Nittis, K., Kontoyiannis, H., Papageorgiou, E., Balopoulos, E., 1999. Climatic changes in the Aegean Sea influence the eastern Mediterranean thermohaline circulation (1986-1997). Geophysical Research Letters, 26 (11), 1617-1620.
Tragou, E., Zervakis, V., Papadopoulos, A., Maderich, V.S., Georgopoulos, D. et al., 2003. Buoyancy transport through the Aegean Sea. In 2nd International Conference on “Oceanography of the Eastern Mediterranean and Black Sea: Similarities and Differences of Two Interconnected Basins (pp. 38-46).
Tsimplis, M.N., Josey, S.A., 2001. Forcing of the Mediterranean Sea by atmospheric oscillations over the North Atlantic. Geophysical Research Letters, 28 (5), 803-806. Tzali, M., Sofianos, S., Mantziafou, A., Skliris, N., 2010. Modelling the impact of Black Sea water inflow on the North Aegean Sea hydrodynamics. Ocean Dynamics, 60, 585- 596.
Velaoras, D., Krokos, G., Nittis, K., Theocharis, A., 2014. Dense intermediate water outflow from the Cretan Sea: A salinity driven, recurrent phenomenon, connected to thermohaline circulation changes. Journal of Geophysical Research: Oceans, 119 (8), 4797-4820.
Velaoras, D., Krokos, G., Theocharis, A., 2015. Recurrent intrusions of transitional waters of Eastern Mediterranean origin in the Cretan Sea as a tracer of Aegean Sea dense water formation events. Progress in Oceanography, 135, 113-124.
Velaoras, D., Papadopoulos, V.P., Kontoyiannis, H., Papageorgiou, D.K., Pavlidou, A., 2017. The Response of the Aegean Sea (Eastern Mediterranean) to the Extreme 2016-2017 Winter. Geophysical Research Letters, 44 (18), 9416-9423.
Wong, A., Robert, K., Thierry, C., Argo Data Management Team, 2020. Argo Quality Control Manual for CTD and Trajectory Data.
Zervakis, V., Georgopoulos, D., Drakopoulos, P.G., 2000. The role of the North Aegean in triggering the recent Eastern Mediterranean climatic changes. Journal of Geophysical Research: Oceans, 105 (C11), 26103-26116.
Zervakis, V., Georgopoulos, D., 2002. Hydrology and circulation in the North Aegean (eastern Mediterranean) throughout 1997 and 1998. Mediterranean Marine Science, 3 (1), 7-21.
Zervakis V., Krasakopoulou E., Georgopoulos D., Souvermezoglou E., 2003. Vertical diffusion and oxygen consumption during stagnation periods in the deep north Aegean. Deep Sea Research, I 50, 53-71.
