Synoptic Conditions and Impact on the Extreme Low Water Stages in Bulgarian Section of Danube River (N 40)

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Synoptic Conditions and Impact on the
Extreme Low Water Stages in Bulgarian
Section of Danube River (N 40)

• 
  TEODOSSIA ANDREEVA
• MARTIN MARTINOV
• National Institute of Meteorology and Hydrology-
  Bulgarian Academy of Sciences, Sofia, Bulgaria
• E-mailteodosia.andreeva_at_meteo.bg

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Contents of the paper

• Abstract
• Information database
• Summer spatial-temporal distribution of pressure
  patterns
• Significant climate anomalies
• Extreme low water stages
• Basic Results
• References

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Fig. 1 Locations of synoptic and climatologically
weather stations in Bulgaria
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Fig. 2 (a, b, c) Mean atmospheric pressure for
June, July and August in 2003 a) June
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b) July
6
c) August
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Fig. 3 Atmospheric pressure at sea level on 7-th
of June
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Fig.4 Atmospheric pressure at 500 hPa level on
7-th of June
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Fig. 5 Annual mean temperatures difference from
1961-1990 normal for station Ruse
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Fig. 6 Analysis of air temperature at the
territory of Bulgaria
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Fig. 7 The annual precipitation difference from
1961-1990 normal for station Ruse
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Fig. 8 Analysis of precipitation at the territory
of Bulgaria
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Fig. 9 Extreme low water stages
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Basic results

• There is the tendency for decreasing of
  precipitation during the 1961 - 2003 period in
  Bulgaria.
• There is exceptionally dry period for all
  territory of the country for the summer of 2003.
• The reduction in summer precipitation during the
  drought period in Bulgaria had strong negative
  influence on water level of the rivers in
  Bulgaria.

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Basic results - continuation

• The blocking processes over West Europe and
  Atlantic Ocean interrupted zonal circulation over
  the Continent, which is significant importance
  for continuously dry period over West, Central
  and Southeast Europe.
• The anticyclonality of the baric field during the
  warm months (May -September) was over normal.
• The climate variability during the drought
  period influenced considerably on the water
  regime in Bulgaria.

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Acknowledgements

• I am grateful to the
  Organising Committee of the Conference
  for the support.
• Teodossia
  Andreeva