NDLI: Interannual variations of the blocking high over the Ural Mountains and its association with the AO/NAO in boreal winter

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Journal of Meteorological Research : Volume 26, Issue 1, February 2012

Journal of Meteorological Research : Volume 25

Interannual variations of the blocking high over the Ural Mountains and its association with the AO/NAO in boreal winter

Content Provider	Springer Nature Link
Author	Li, Chao Zhang, Qingyun Ji, Liren Peng, Jingbei
Copyright Year	2012
Abstract	This paper analyzes interannual variations of the blocking high over the Ural Mountains in the boreal winter and their association with the Arctic Oscillation/North Atlantic Oscillation (AO/NAO). In January, the relationship between the Ural blocking high (UR) and the AO index is statistically significant. The UR tends to occur more frequently and with greater strength during negative AO periods. Some strong URs also occur during positive AO phases (positive UR-AO events), as in January 2008. This paper discusses the characteristics of atmospheric circulation in the cases of positive UR-AO events and contrast cases (negative UR-AO events). The eastward extending of the Icelandic Low (IL) center and the associated NAO dipole anomaly pattern in the upstream region may play a more important role for the UR-AO events. When the center of the IL shifts eastward to 30°W, the amplitude of zonal wavenumber 2 (wavenumber 3) is intensified in the positive (negative) UR-AO events, which favors positive (negative) height anomalies over the Urals. Further analyses indicate that the intensified zonal wind in high latitudes and weakened zonal wind in midlatitudes over the North Atlantic Ocean render the eastward shift of the IL and the NAO dipole anomaly pattern. The Ural blocking in January 2008 bears similar characteristics to the positive UR-AO events.
Starting Page	163
Ending Page	175
Page Count	13
File Format	PDF
ISSN	08940525
Journal	Journal of Meteorological Research
Volume Number	26
Issue Number	2
e-ISSN	21914788
Language	English
Publisher	The Chinese Meteorological Society
Publisher Date	2012-05-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ural blocking high AO NAO dipole anomaly pattern Icelandic Low Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology Climate Change Geophysics and Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Ocean Engineering Atmospheric Science

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