The Summer North Atlantic Oscillation Influence on the Eastern Mediterranean

Themis Chronis Institute of Oceanography, Hellenic Centre for Marine Research, Anavissos, Attica, Greece

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Dionysios E. Raitsos Institute of Oceanography, Hellenic Centre for Marine Research, Anavissos, Attica, Greece

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Dimitris Kassis Institute of Oceanography, Hellenic Centre for Marine Research, Anavissos, Attica, Greece

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Athanassios Sarantopoulos Hellenic National Meteorological Service, Athens, Greece

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Abstract

This study highlights an important and previously overlooked summer North Atlantic Oscillation (NAO) influence over the eastern Mediterranean. The featured analysis is based on a synergistic use of reanalysis data, satellite retrievals, and coastal and buoy meteorological observations. The physical mechanisms at play reveal a strong summer NAO involvement on the pressure fields over northern Europe and the Anatolian plateau. Especially during August, the summer NAO modulates the Anatolian low, together with the air temperature, meridional atmospheric circulation, and cloudiness over the eastern Mediterranean. Including the dominant action centers over Greenland and the Arctic, the identified modulations rank among the strongest summer NAO-related signals over the entire Northern Hemisphere.

Corresponding author address: T. Chronis, Institute of Oceanography, Hellenic Centre for Marine Research (HCMR), 46.7 Km Athens-Sounio, P.O. Box 712, 190 13, Anavissos, Attica, Greece. E-mail: themis@ath.hcmr.gr

Abstract

This study highlights an important and previously overlooked summer North Atlantic Oscillation (NAO) influence over the eastern Mediterranean. The featured analysis is based on a synergistic use of reanalysis data, satellite retrievals, and coastal and buoy meteorological observations. The physical mechanisms at play reveal a strong summer NAO involvement on the pressure fields over northern Europe and the Anatolian plateau. Especially during August, the summer NAO modulates the Anatolian low, together with the air temperature, meridional atmospheric circulation, and cloudiness over the eastern Mediterranean. Including the dominant action centers over Greenland and the Arctic, the identified modulations rank among the strongest summer NAO-related signals over the entire Northern Hemisphere.

Corresponding author address: T. Chronis, Institute of Oceanography, Hellenic Centre for Marine Research (HCMR), 46.7 Km Athens-Sounio, P.O. Box 712, 190 13, Anavissos, Attica, Greece. E-mail: themis@ath.hcmr.gr
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  • Alpert, P., R. Abramsky, and B. Neeman, 1990: The prevailing summer synoptic system in Israel—Subtropical high, not Persian trough. Isr. J. Earth Sci., 39, 93–102.

    • Search Google Scholar
    • Export Citation
  • Alpert, P., I. Osetinsky, B. Ziv, and H. Shafir, 2004: A new seasons’ definition based on the classified daily synoptic systems, an example for the eastern Mediterranean. Int. J. Climatol., 24, 1001–1011.

    • Search Google Scholar
    • Export Citation
  • Barnston, A. G., and R. E. Livezey, 1987: Classification, seasonality, and persistence of low-frequency atmospheric circulation patterns. Mon. Wea. Rev., 115, 1825.

    • Search Google Scholar
    • Export Citation
  • Barry, R. G., and R. J. Chorley, 1992: Atmosphere, Weather and Climate. 6th ed. Routledge, 392 pp.

  • Bartzokas, A., and E. Houssos, 2005: Extreme temperature events in NW Greece. Proc. 10th Int. Conf. on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Sissi, Crete, Harmonisation Initiative, 556–560.

    • Search Google Scholar
    • Export Citation
  • Bjornsson, H., and S. A. Venegas, 1997: A manual for EOF and SVD analyses of climate data. McGill University, CCGCR Rep. 97-1, 52 pp.

  • Bladé, I., B. Liebmann, D. Fortuny, and G. J. van Oldenborgh, 2011: Observed and simulated impacts of the summer NAO (SNAO) in the Southern Europe/Mediterranean region: Connections to projected drying in this region. Climate Dyn., in press.

    • Search Google Scholar
    • Export Citation
  • Brody, L. R., and M. J. R. Nestor, 1980: Regional forecasting aids for the Mediterranean Basin: Handbook for forecasters in the Mediterranean, Part 2. Naval Research Laboratory Tech. Rep. 80-10, 178 pp.

    • Search Google Scholar
    • Export Citation
  • Carapiperis, L. N., 1951: On the periodicity of the Etesian in Athens. Weather, 6, 378–380.

  • Carapiperis, L. N., 1956: On the great and abrupt falls of air temperature in Athens. Pure Appl. Geophys., 35, 143–148.

  • Chronis, T., V. Papadopoulos, and E. Nikolopoulos, 2011: QuikSCAT observations of extreme wind events over the Mediterranean and Black Seas during 2000–2008. Int. J. Climatol.,.doi:10.1002/joc.2213, in press

    • Search Google Scholar
    • Export Citation
  • Dorn, W., K. Dethloff, A. Rinke, and E. Roeckner, 2003: Competition of NAO regime changes and increasing greenhouse gases and aerosols with respect to Arctic climate projections. Climate Dyn., 21, 447–458, doi:10.1007/s00382-003-0344-2.

    • Search Google Scholar
    • Export Citation
  • Eshel, G., M. A. Cane, and B. F. Farrell, 2000: Forecasting eastern Mediterranean droughts. Mon. Wea. Rev., 128, 3618–3630.

  • Feldstein, S. B., 2007: The dynamics of the North Atlantic Oscillation during the summer season. Quart. J. Roy. Meteor. Soc., 133, 1509–1518.

    • Search Google Scholar
    • Export Citation
  • Fisher, W. B., 1978: The Middle East. 7th ed. Cambridge University Press, 5–47.

  • Folland, C. K., J. Knight, and H. W. Linderholm, D. Fereday, S. Ineson, and J. W. Hurrell, 2009: The summer North Atlantic Oscillation: Past, present, and future. J. Climate, 22, 1082–1103.

    • Search Google Scholar
    • Export Citation
  • Georgopoulos, D., 2002: Water masses, dynamic structure and circulation in the north Aegean Sea. Ph.D. thesis, University Patras, 324 pp.

    • Search Google Scholar
    • Export Citation
  • Hadjimichael, M., A. P. Kuciauskas, L. R. Brody, P. M. Tag, R. L. Bankert, and J. E. Peak, 2002: A meteorological fuzzy expert system incorporating subjective user input. Knowl. Inf. Syst., 4.

    • Search Google Scholar
    • Export Citation
  • Hurrell, J. W., 1995: Decadal trends in the North Atlantic Oscillation and relationships to regional temperature and precipitation. Science, 269, 676–679.

    • Search Google Scholar
    • Export Citation
  • Hurrell, J. W., and H. van Loon, 1997: Decadal variations in climate associated with the North Atlantic Oscillation. Climatic Change, 36, 301.

    • Search Google Scholar
    • Export Citation
  • Hurrell, J. W., and C. K. Folland, 2002: A change in the summer atmospheric circulation over the North Atlantic. Exchanges, 25, 1–3.

    • Search Google Scholar
    • Export Citation
  • Hurrell, J. W., and C. Deser, 2009: North Atlantic climate variability: The role of the North Atlantic Oscillation. J. Mar. Syst., 78, 28–41.

    • Search Google Scholar
    • Export Citation
  • Hurrell, J. W., and Coauthors, 2003: The North Atlantic Oscillation: Climatic Significance and Environmental Impact. Geophys. Monogr., Vol. 134, Amer. Geophys. Union, 279 pp.

    • Search Google Scholar
    • Export Citation
  • Hurrell, J. W., M. P. Hoerling, A. S. Phillips, and T. Xu, 2004: Twentieth century North Atlantic climate change. Part I: Assessing determinism. Climate Dyn., 23, 371.

    • Search Google Scholar
    • Export Citation
  • Jones, P. D., T. Johnsson, and D. Wheeler, 1997: Extension to the North Atlantic Oscillation using early instrumental pressure observations from Gibraltar and southwest Iceland. Int. J. Climatol., 17, 1433–1450.

    • Search Google Scholar
    • Export Citation
  • Kalnay, E., and Coauthors, 1996: The NCEP/NCAR 40-Year Re-Analysis Project. Bull. Amer. Meteor. Soc., 77, 437–471.

  • Kanamitsu, M., W. Ebisuzaki, J. Woollen, S.-K. Yang, J. J. Hnilo, M. Fiorino, and G. L. Potter, 2002: NCEP–DOE AMIP-II Reanalysis (R-2). Bull. Amer. Meteor. Soc., 83, 1631–1643.

    • Search Google Scholar
    • Export Citation
  • Kassis, D., and K. Nittis, 2008: Aegean Sea surface circulation dynamics derived from real-time buoy measurements. Proc. Fifth Int. Conf. on EuroGOOS, Exeter, United Kingdom.

    • Search Google Scholar
    • Export Citation
  • Kotroni, V., K. Lagouvardos, and D. Lalas, 2001: The effect of the island of Crete on the Etesian winds over the Aegean Sea. Quart. J. Roy. Meteor. Soc., 127, 1917–1937.

    • Search Google Scholar
    • Export Citation
  • Lascaratos, A., 1992: Hydrology of the Aegean Sea. Winds and Currents of the Mediterranean Basin, H. Charnock Ed., Harvard University, 313–334.

    • Search Google Scholar
    • Export Citation
  • Lionello, P., and A. Sanna, 2005: Mediterranean wave climate variability and its links with NAO and Indian Monsoon. Climate Dyn., 25, 611–623.

    • Search Google Scholar
    • Export Citation
  • Lolis, C. J., A. Bartzokas, and B. D. Katsoulis, 2002: Spatial and temporal 850 hPa air temperature and SST covariances in the Mediterranean region and their connection to atmospheric circulation. Int. J. Climatol., 22, 663–676.

    • Search Google Scholar
    • Export Citation
  • Maheras, P., 1980: Le problème des Etesiens. Mediterranee, 40, 57–66.

  • Mears, C. A., and F. J. Wentz, 2005: The effect of drifting measurement time on satellite-derived lower tropospheric temperature. Science, 309, 1548–1551, doi:10.1126/science.1114772.

    • Search Google Scholar
    • Export Citation
  • Metaxas, D. A., 1977: The interannual variability of the Etesian frequency as a response of atmospheric circulation anomalies. Bull. Hellenic Meteor. Soc., 2, 30–40.

    • Search Google Scholar
    • Export Citation
  • Metaxas, D. A., and A. Bartzokas, 1994: Pressure co-variability over the Atlantic, Europe and N. Africa. Application: Centers of action for temperature, winter precipitation and summer winds in Athens, Greece. Theor. Appl. Climatol., 49, 9–18.

    • Search Google Scholar
    • Export Citation
  • Met Office, 1962: Weather in the Mediterranean. Vol. I, 2nd ed. Met Office, 225 pp.

  • Nittis, K., T. Soukissian, and G. Chronis, 2002: Operational forecasting in the Aegean Sea: The POSEIDON system. Operational Oceanography: Implementation at the European and Regional Scales, N. C. Flemming et al., Eds., Elsevier Oceanography Series, Vol. 66, Elsevier, 211–218.

    • Search Google Scholar
    • Export Citation
  • Ogi, M., K. Yamazaki, and Y. Tachibana, 2004: The summertime annular mode in the Northern Hemisphere and its linkage to the winter mode. J. Geophys. Res., 109, D20114, doi:10.1029/2004JD004514.

    • Search Google Scholar
    • Export Citation
  • Ogi, M., K. Yamazaki, and Y. Tachibana, 2005: The summer northern annular mode and abnormal summer weather in 2003. Geophys. Res. Lett., 32, L04706, doi:10.1029/2004GL021528.

    • Search Google Scholar
    • Export Citation
  • Pozo-Vazquez, D., M. J. Esteban-Parra, F. S. Rodrigo, and Y. Castro-Dìiez, 2001: A study on NAO variability and its possible non-linear influences on European surface temperatures. Climate Dyn., 17, 701–715.

    • Search Google Scholar
    • Export Citation
  • Raitsos, D. E., G. Beaugrand, D. Georgopoulos, A. Zenetos, M. A. Pancucci-Papadopoulou, A. Theocharis, and E. Papathanassiou, 2010: Global climate change amplifies the entry of tropical species into the eastern Mediterranean Sea. Limnol. Oceanogr., 55, 1478–1484.

    • Search Google Scholar
    • Export Citation
  • Reiter, E. R., 1971: Digest of selected weather problems for the Mediterranean. Navy Weather Research Facility, Naval Air Station Rep., 142 pp.

    • Search Google Scholar
    • Export Citation
  • Rogers, J. C., 1997: North Atlantic storm track variability and its association to the North Atlantic Oscillation and climate variability of Northern Europe. J. Climate, 10, 1635–1647.

    • Search Google Scholar
    • Export Citation
  • Saha, S., and Coauthors, 2006: The NCEP Climate Forecast System. J. Climate, 19, 3483–3517.

  • Serreze, M. C., F. Carse, R. G. Barry, and J. C. Rogers, 1997: Icelandic low cyclone activity: Climatological features, linkages with the NAO and relationships with recent changes in the Northern Hemisphere circulation. J. Climate, 10, 453–464.

    • Search Google Scholar
    • Export Citation
  • Soukissian, T., G. Chronis, K. Nittis, and C. Diamanti, 2002: Advancement of operational oceanography in Greece: The case of the Poseidon system. Global Atmos. Ocean Syst., 8, 93–107.

    • Search Google Scholar
    • Export Citation
  • Trigo, R. M., T. J. Osborn, and J. Corte-Real, 2002b: The North Atlantic Oscillation influence on Europe: Climate impacts and associated physical mechanisms. Climate Res., 20, 9–17.

    • Search Google Scholar
    • Export Citation
  • Visbeck, H. M., J. W. Hurrell, L. Polvani, and H. M. Cullen, 2001: The North Atlantic Oscillation: Past. Proc. Natl. Acad. Sci. USA, 98, 12 876–12 877.

    • Search Google Scholar
    • Export Citation
  • Wallace, J. M., and D. S. Gutzler, 1981: Teleconnections in the geopotential height field during the Northern Hemisphere winter. Mon. Wea. Rev., 109, 784–812.

    • Search Google Scholar
    • Export Citation
  • Ziv, B., H. Saaroni, and P. Alpert, 2004: The factors governing the summer regime of the eastern Mediterranean. Int. J. Climatol., 24, 1859–1871.

    • Search Google Scholar
    • Export Citation
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