期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 116, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2010JD015006
关键词
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资金
- Korea Meteorological Administration Research and Development [RACS_2010-2005]
- Brain Korea 21(BK21) program
- Korea Meteorological Administration [RACS2010-2601] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this work the spatial growth of the North Atlantic Oscillation (NAO) and its relationship to downstream development are examined. In contrast to positive NAO events, which are primarily initiated over the western North Atlantic, negative persistent NAO events tend to be preceded by a blocking ridge in the vicinity of northern Europe. This blocking ridge contributes to the growth of negative NAO events through a low-frequency eddy interaction. It is also shown that a noticeable downstream development is dominant only for negative persistent NAO events that are preceded by the blocking ridge. While the blocking ridge exists over inland Eurasia, it induces anticyclonic circulation near the surface over Siberia. As the NAO grows, a stationary wave train that originates from the North Atlantic transfers wave energy downstream toward Siberia. The surface anticyclone is then reinforced by the wave train and begins to migrate eastward. This process explains the distinct impact of the negative NAO on the downstream Eurasian region.
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