Circulation weather types and their influence on temperature and precipitation in Estonia
An existing objective classification scheme of the atmospheric circulation, where daily circulation is determined through the strength, direction and vorticity of the geostrophic flow has been applied over the Baltic Sea region for the time period of 1968–1997. The results at sea level and the highe...
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Online Access: | http://hdl.handle.net/10138/578159 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578159 2024-09-15T18:00:10+00:00 Circulation weather types and their influence on temperature and precipitation in Estonia Post, P. Truija, V. Tuulik, J. 2024-06-27T13:44:44Z 281-289 application/pdf http://hdl.handle.net/10138/578159 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 3 7 http://hdl.handle.net/10138/578159 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z An existing objective classification scheme of the atmospheric circulation, where daily circulation is determined through the strength, direction and vorticity of the geostrophic flow has been applied over the Baltic Sea region for the time period of 1968–1997. The results at sea level and the higher isobaric levels of 500 hPa, 700 hPa and 850 hPa are presented here. The analysis revealed that the most common circulation types are anticyclonic and cyclonic. The mean-square-error skill scores are used to investigate classification's suitability for describing the variability of the local (Pärnu) daily weather elements. The skill scores of the objective classification are essentially higher than those for the German Weather Service's "Grosswetterlagen" scheme, but the scores are still low due to the high variability of daily temperature and precipitation within the weather types. Temperature is best described by the classifications at higher levels of pressure (500 hPa and 700 hPa), but precipitation is best described by those at the lower levels (sea level and 850 hPa). Developing one good classification for both variables is non-trivial. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
An existing objective classification scheme of the atmospheric circulation, where daily circulation is determined through the strength, direction and vorticity of the geostrophic flow has been applied over the Baltic Sea region for the time period of 1968–1997. The results at sea level and the higher isobaric levels of 500 hPa, 700 hPa and 850 hPa are presented here. The analysis revealed that the most common circulation types are anticyclonic and cyclonic. The mean-square-error skill scores are used to investigate classification's suitability for describing the variability of the local (Pärnu) daily weather elements. The skill scores of the objective classification are essentially higher than those for the German Weather Service's "Grosswetterlagen" scheme, but the scores are still low due to the high variability of daily temperature and precipitation within the weather types. Temperature is best described by the classifications at higher levels of pressure (500 hPa and 700 hPa), but precipitation is best described by those at the lower levels (sea level and 850 hPa). Developing one good classification for both variables is non-trivial. |
format |
Article in Journal/Newspaper |
author |
Post, P. Truija, V. Tuulik, J. |
spellingShingle |
Post, P. Truija, V. Tuulik, J. Circulation weather types and their influence on temperature and precipitation in Estonia |
author_facet |
Post, P. Truija, V. Tuulik, J. |
author_sort |
Post, P. |
title |
Circulation weather types and their influence on temperature and precipitation in Estonia |
title_short |
Circulation weather types and their influence on temperature and precipitation in Estonia |
title_full |
Circulation weather types and their influence on temperature and precipitation in Estonia |
title_fullStr |
Circulation weather types and their influence on temperature and precipitation in Estonia |
title_full_unstemmed |
Circulation weather types and their influence on temperature and precipitation in Estonia |
title_sort |
circulation weather types and their influence on temperature and precipitation in estonia |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578159 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 3 7 http://hdl.handle.net/10138/578159 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1810437314521858048 |