The atmospheric circulation patterns during dry periods in Lithuania

• Autorzy: Rimkus E. , Kažys J. , Valiukas D. , Stankunavičius G.

Identyfikatory

DOI

10.5697/oc.56-2.223

• Języki publikacji: EN

Abstrakty

EN

This paper reveals the atmospheric circulation patterns during dry periods in Lithuania.~The research covers the period from 1961 to 2010. Atmospheric circulation features were analysed using the Hess and Brezowski classification of macro-circulation forms, NAO and AO indices, a 500 hPa geopotential height field and the Tibaldi-Molteni blocking index. Different phases of the dry period (developing, persisting and attenuation) were evaluated individually. Also, the regional differences of dry period formation were investigated. In general dry periods are determined by a decrease in zonal and an increase in meridional circulation forms as well as the atmospheric blocking process over the Baltic region longitudinal belt 0-20 days prior to the start of the dry period. An especially strong shift from general circulation patterns are observed during the developing phase of a dry period. Drought persistence in the Baltic region is almost always predetermined by strong anticyclonic circulation. Most drought development stages are associated with negative NAO/AO phases.

Słowa kluczowe

EN

droughts; atmospheric circulation; hydrothermal coefficient; TMI blocking index; North Atlantic oscillation; NAO; Arctic oscillation; AO

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2014
• Tom: No. 56 (2)
• Strony: 223--239
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr.

Twórcy

autor

Rimkus E.

• Department of Hydrology and Climatology, Vilnius University, M. K. Čiurlionio 21/27, LT-03101 Vilnius, Lithuania

autor

Kažys J.

• Department of Hydrology and Climatology, Vilnius University, M. K. Čiurlionio 21/27, LT-03101 Vilnius, Lithuania

autor

Valiukas D.

• Department of Hydrology and Climatology, Vilnius University, M. K. Čiurlionio 21/27, LT-03101 Vilnius, Lithuania

autor

Stankunavičius G.

• Department of Hydrology and Climatology, Vilnius University, M. K. Čiurlionio 21/27, LT-03101 Vilnius, Lithuania

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