eesti teaduste
akadeemia kirjastus
Estonian Journal of Engineering

Distribution of extreme wet and dry days in Estonia in last 50 years; 252-259

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Tiina Tammets

Estimation of extreme wet and dry weather conditions on the basis of moving average of daily precipitation allows to determine the most drastic periods and trends of the precipitation regime in Estonia in last 50 years. The wet and dry days have been selected from the calculation results of the precipitation moving average. A day is considered as extreme wet when the moving average of the daily precipitation is at least 10 mm on 10 successive days till this day. A day is considered as extreme dry when there was no precipitation during 20 successive days till the observed day. Inter-annual variability of the average number of wet and dry days in Estonia has remarkably grown in 1957–2006; the years with a large number of wet or dry days can be easily distinguished. The increase of the annual total number of extreme (wet and dry) days is obvious.

 1. IPCC. The Scientific Basis. Contribution of Working Group I to the Second Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, New York, 2001.

 2. Menne, B. Extreme weather events and health. In Extreme Weather Events (Kirch, W., Menne, B. and Bertollini, R., eds.). Springer, 2005, 27–39.

 3. Hales, S., Edwards, S. J. and Kovats, R. S. Impacts on health of climate extremes. In Climate Change and Human Health. WHO, Genf, 2003, 79–102.

 4. IFAS. Extreme heat and drought. In The Disaster Handbook, National Edition. Institute of Food and Agriculture Sciences, University of Florida, 1988, 1–3.

 5. Kirde, K. Andmeid Eesti kliimast. Tartu, 1939.

 6. Scientific Handbook of the Climate of the USSR. Gidrometeoizdat, Leningrad, 1990, vol. 3, 1–6 (in Russian).

 7. Eesti keskkonnaseire 2004–2005.

 8. ECA&D, 2004.

 9. Klein Tank, A., Wijngaard, J. and van Engelen, A. Climate of Europe. Assessment of Observed Daily Temperature and Precipitation Extremes. European Climate Assessment (ECA). KNMI, de Bilt, 2002.

10. Schmidli, J. and Frei, Ch. Trends of heavy precipitation and wet and dry spells in Switzerland during the 20th century. Int. J. Climatol., 2005, 25, 753–771.


11. Kivi, K. Ohtlikud ilmanähtused. EMHI, Tallinn, 1998.

12. Tammets, T. Changes in frequency of extreme wet and dry conditions in Estonia. In Proc. International Conference on Climate Change: Impacts and Responses in Central and Eastern European Countries. Pecs, 2005, 87–93.

13. Hüdrometeoroloogiajaamade ja vaatluspostide juhend. Vol. 2, Part I. Tallinn, 1989.

14. Tammets, T. Precipitation and snow measurements in Estonia and assessment of their possible extreme values. In Reporting of the GCOS Regional Workshop for Eastern and Central Europe on Improving Observing Systems for Climate. GCOS-100, Leipzig, 2005, 125–127.

15. Jaagus, J. Climate change tendencies in Estonia in relation with changes in atmospheric circulation during the second half of the 20th century. In Publ. Inst. Geogr. Universitatis Tartuensis. Tartu, 2003, 62–79.

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