Temporal evolution of the water characteristics in the bays along the eastern coast of the Aegean Sea: Saros, İzmir, and Gökova bays

The seasonal and interannual variability of the local hydrography in 3 bays (Saros, İzmir, and Gökova bays) along the eastern coast of the Aegean Sea are investigated using data sets collected from 1991 to 2010. The data cover the last major deep-water formation episodes and the Eastern Mediterranean Transient (EMT) relaxation period. Aegean Sea hydrology and water mass characteristics influence the water properties of the bays. The data suggest that Saros Bay (North Aegean Sea), İzmir Bay (Central Aegean Sea), and Gökova Bay (South Aegean Sea) have different physical processes and water characteristics. They have their own dynamics independent from the Aegean Sea. At the same time, they are occasionally influenced by the Aegean Sea's physical processes. The time evolution of water properties inside the bays is investigated by analyzing the temperature, salinity, and density. The bays' data show the relaxation period of the EMT, which continued well into the early 2000s. It is known that this variability depends on the changing climate over the Mediterranean area. Our analysis reveals that the dense water formation in the Central Aegean Sea is considerably connected to the anomalous decrease in winter atmospheric temperature during the EMT period. The isopycnal levels started to increase again and reached their maximum after the EMT relaxation period in the summer of 2007 together with a salinity increase in the water column. The outcropping of isopycnals could have been a sign of a new formation of very dense water in the Aegean Sea.

Temporal evolution of the water characteristics in the bays along the eastern coast of the Aegean Sea: Saros, İzmir, and Gökova bays

The seasonal and interannual variability of the local hydrography in 3 bays (Saros, İzmir, and Gökova bays) along the eastern coast of the Aegean Sea are investigated using data sets collected from 1991 to 2010. The data cover the last major deep-water formation episodes and the Eastern Mediterranean Transient (EMT) relaxation period. Aegean Sea hydrology and water mass characteristics influence the water properties of the bays. The data suggest that Saros Bay (North Aegean Sea), İzmir Bay (Central Aegean Sea), and Gökova Bay (South Aegean Sea) have different physical processes and water characteristics. They have their own dynamics independent from the Aegean Sea. At the same time, they are occasionally influenced by the Aegean Sea's physical processes. The time evolution of water properties inside the bays is investigated by analyzing the temperature, salinity, and density. The bays' data show the relaxation period of the EMT, which continued well into the early 2000s. It is known that this variability depends on the changing climate over the Mediterranean area. Our analysis reveals that the dense water formation in the Central Aegean Sea is considerably connected to the anomalous decrease in winter atmospheric temperature during the EMT period. The isopycnal levels started to increase again and reached their maximum after the EMT relaxation period in the summer of 2007 together with a salinity increase in the water column. The outcropping of isopycnals could have been a sign of a new formation of very dense water in the Aegean Sea.

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  • Gertman IF, Pinardi N, Popov Y, Hecht A (2006). Aegean Sea water masses during the early stages of the Eastern Mediterranean Climatic Transient (1988–1990), J Phys Oceanogr 36: 1841–1859.
  • Klein B, Roether W, Manca BB, Bregant D, Beitzel V, Kovačevic V, Lucchetta A (1999). The large deep water transient in the Eastern Mediterranean. Deep-Sea Res Pt I 46: 371–414.
  • Lascaratos A, Roether W, Nittis K, Klein B (1999). Recent changes in deep water formation and spreading in the Mediterranean Sea: a review. Prog Oceanogr 44: 5–36.
  • Malanotte-Rizzoli P, Manca BB, Ribera d’Alcala M, Theocharis A, Brenner S, Budillon G, Ozsoy E (1999). The Eastern Mediterranean in the 80s and in the 90s: the big transition in the intermediate and deep circulations. Dynam Atmos Oceans 29: 365–395.
  • Oğuz T (2011). Climate change signatures and impacts for the Black Sea ecosystem. 3rd Bi-annual BS Scientific Conference and UPGRADE BS-SCENE Project Joint Conference, Odessa, Ukraine, 1–4 November 2011.
  • Pazı I (2008). Water mass properties and chemical characteristics in the Saros Gulf, Northeast Aegean Sea (Eastern Mediterranean), J Marine Syst 74: 698–710.
  • Roether W, Manca BB, Klein B, Bregant D, Georgopoulos D, Beitzel V, Kovacevic V, Luchetta A (1996). Recent changes in the eastern Mediterranean deep waters. Science 271: 333–335.
  • Roether W, Klein B, Manca BB, Theocharis A, Kioroglou S (2007). Transient Eastern Mediterranean deep waters in response to the massive dense-water output of the Aegean Sea in the 1990’s, Prog Oceanogr 74: 540–571.
  • Samuel S, Haines K, Josey S, Myers PG (1999). Response of the Mediterranean Sea thermohaline circulation to observed changes in the winter wind stress field in the period 1980–1993. J Geophys Res 104: 7771–7784.
  • Sayın E (2003). Physical features of the İzmir Bay. Cont Shelf Res 23: 957–970.
  • Sayın E, Pazı İ, Eronat C (2006). Investigation of water masses in İzmir Bay, Western Turkey. Turkish J Earth Sci 15: 343–372.
  • Sayın E, Adalıoğlu S, Eronat C (2007). The light transmission and seiche depth of İzmir Bay, Western Turkey. J Earth Syst Sci 116: 57–71.
  • Sayın E, Beşiktepe ST (2010). Temporal evolution of the water mass properties during the Eastern Mediterranean Transient (EMT) in the Aegean Sea. J Geophys. Res 115: 1–9.
  • Sayın E, Eronat C, Uçkaç, Ş, Beşiktepe ST (2011). Hydrography of the eastern part of the Aegean Sea during the Eastern Mediterranean Transient (EMT). J Marine Syst 88: 502–515.
  • Schlitzer R, Roether W, Hausmann M, Junghans HG, Oster H, Johannsen H, Michelato A (1991). Chlorofluoromethane and oxygen in the Eastern Mediterranean. Deep-Sea Res Pt I 38: 1531–1551.
  • Theocharis A, Balopoulos E, Kioroglou S, Kontoyiannis H, Iona A (1999). A synthesis of the circulation and hydrography of the South Aegean Sea and the Straits of the Cretan Arc (March 1994– January 1995). Prog Oceanogr 44: 469–509.
  • Theocharis A, Klein B, Nittis K, Roether W (2002). Evolution and status of the eastern Meditarranean Transient (1997–1999). J Marine Syst 33–34: 91–116.
  • Tokat E (2006). Hydrological and biological water properties of Saros bay, MSc, Dokuz Eylül University, İzmir, Turkey (thesis in Turkish with an abstract in English).
  • Tokat E, Sayın E (2007). Water masses influencing the hydrographic properties of Saros bay. Rapp Comm Int Mer Medit Vol. 38 – p. 20
  • Uluturhan E (2010). Heavy metal concentrations in surface sediments from two regions (Saros and Gökova Gulfs) of the Eastern Aegean Sea. Environ Monit Assess 165: 675–684.
  • Velaoras D, Lascaratos A (2005). Deep water mass characteristics and interannual variability in the North and Central Aegean Sea. J Marine Syst 53: 59–85.
  • Velaoras D, Lascaratos A (2010). North–Central Aegean Sea surface and intermediate water masses and their role in triggering the Eastern Mediterranean Transient. J Marine Syst 83: 58–66.
  • Yaşar D (1994). Late glacial-holocene evolution of the Aegean Sea. PhD, Dokuz Eylül University, İzmir, Turkey.
  • Zervakis V, Krasakopoulou E, Georgopoulos D, Souvermezoglou E (2003). Vertical diffusion and oxygen consumption during stagnation periods in the deep North Aegean. Deep-Sea Res Pt I 50: 53–71.
  • Zervakis V, Georgopoulos D, Karageorgisa AAP, Theocharis A (2004). On the response of the Aegean Sea to climatic variability: A Review. Int J Climatol 24: 1845–1858.
Turkish Journal of Earth Sciences-Cover
  • ISSN: 1300-0985
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK