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E. V. YAKUSHEV, O.I.PODYMOV Southern Branch of P.P.Shirshov Institute of Oceanology,

o Gelendzhik. INTERANNUAL DYNAMICS OF THE BLACK SEA ANOXIC ZONE BOUNDARY IN CONNECTION WITH CLIMATIC VARIABILITY. E. V. YAKUSHEV, O.I.PODYMOV Southern Branch of P.P.Shirshov Institute of Oceanology, Gelendzhik, Russia. Oxic/anoxic interface. is situated below CIL with winter aeration.

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E. V. YAKUSHEV, O.I.PODYMOV Southern Branch of P.P.Shirshov Institute of Oceanology,

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  1. o Gelendzhik INTERANNUAL DYNAMICS OF THE BLACK SEA ANOXIC ZONE BOUNDARY IN CONNECTION WITH CLIMATIC VARIABILITY E. V. YAKUSHEV, O.I.PODYMOV Southern Branch of P.P.Shirshov Institute of Oceanology, Gelendzhik, Russia

  2. Oxic/anoxic interface is situated below CIL with winter aeration O2 andNO3 dissappears H2S, NH4,CH4 and Mn2+ onsets Stability ib the density field Changeability (maxNO3, minPO4, grad H2S, grad Mn2+) • region? • season? • eddies? • climate?

  3. Data of Shirshov Institute of Oceanology expeditions : 1984-1990 1991-2004 about 1400 Stations

  4. Interannual variability of H2S onset and averaged O2 content in CIL Mean winter air temperature(Gelendzhik) Oscillations of NAO indices for winter period T in the CIL core in summer-autumn period (Krivosheya et al., 2002)

  5. Interannual variability of H2S, NH4,Mn, CH4 onsets and averaged O2 content in CIL

  6. Scheme of oxygen balance in the Black Sea

  7. CONCLUSIONS: Anoxic boundary position is an indicator of climatic changes. Interannual oscillations of the Black Sea H2S boundary at about 0.05-0.10 kg/m3 (5-10 m). The change of volume of the oxic waters for about 5-10%, where the Black Sea oxic ecosystem is situated. Such oscillations are vitally significant and should be studied.

  8. o Gelendzhik STUDY OF THE SEASONAL VARIABILITY OF HYDROCHEMICAL PARAMETERS IN THE NORTHEASTERN BLACK SEA AS AN EXAMPLE OF GELENDZHIK AND GOLUBAYA BAYS E. V. YAKUSHEV, E. A. ANTIPOVA, V. K. CHASOVNIKOV, I. A. KOVALEVA Southern Branch of P.P.Shirshov Institute of Oceanology, Gelendzhik, Russia

  9. Gelendzhik bay resort area ( 2 million men in 2004 ) restricted water exchange with the sea.

  10. Blue Bay SB SIO occupies the area of 18 hectares (marked with green).

  11. Position: Sampling in 2 points every week since 1999 Gelendzhik bay surveys in January and June O2, pH, Alk, PO4, Ptot, Si, NO3, NO2, NH4, Ntot,Urea, Mn, H2S, CH4, Cd, Pb, Zn, Cu , Oil products, surfactants, phyto-, zoo-, bacteria- plankton

  12. Winter 2001 survey NO3 , μM Porg, mM Salinity, psu Phyto, mg/m3 NH4 , μM Si , μM

  13. Oil products on the surface 25.06.2001 (left) and 03.02.2005 (right). extremely complex and unstable hydrophysical structure  Spot-like distribution. local maximums of increased concentrations can be observed in different parts of the bay and affect its ecosystem.

  14. Seasonal changes in 2000 seasonality rains CGel>CGol P-limited

  15. PO4 O2 waterspout events: PO4>6.5 М, NO3>18 М, NH4>24 М Seasonal variability of dissolved oxygen (left) and phosphate (right) in Gelendzhik (squares) and Golubaya (crosses) bays in 2000, 2003, 2004. 1.5 mln in 2000, 2.0 mln in 2004: Increased eutrophication?

  16. Gelendzhik Bay is a local source of pollution connected with resort business: Increased influx of man-made pollutants (heavy metals, oil, surfactants) Eutrophication: increased nutrient (N, P) influx in inorganic and organic forms. Phosphate doesn’t limit photosynthesis during the summer period. Abnormal ecosystem development. Appearance of toxic species.

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