Shifts in early spring wind regime in North-East Europe (1955–2007)
Changes to the winter-to-spring switch-time of the upper air flow regime at the 850 and 500 hPa levels over the north-eastern Baltic Sea are analyzed based on a data set extending from 1955 to 2007. The long-term variation of the air flow in early spring (March) exhibits multiple regime shifts. The...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2008-08-01
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| Series: | Climate of the Past |
| Online Access: | http://www.clim-past.net/4/147/2008/cp-4-147-2008.pdf |
| Summary: | Changes to the winter-to-spring switch-time of the upper air flow regime at the 850 and 500 hPa levels over the north-eastern Baltic Sea are analyzed based on a data set extending from 1955 to 2007. The long-term variation of the air flow in early spring (March) exhibits multiple regime shifts. The shifts are extracted by means of a vector analysis of the monthly mean air flow and using statistical shift detection technology. In the middle of the 1960s the average air flow turned from NW (WNW) to W (WSW) at the 500 (850) hPa level. The original regime was restored in the mid-1990s. The regime shifts in the average air flow in March can be interpreted as changes in the transition time from winter to summer circulation type. |
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| ISSN: | 1814-9324 1814-9332 |