Classification of wintertime large-scale tilted ridges over the Eurasian continent and their influences on surface air temperature

Autor: Bueh Cholaw, Xie Zuo-Wei, LI Da-Wei
Rok vydání: 2018
Předmět:
Zdroj: Atmospheric and Oceanic Science Letters, Vol 11, Iss 5, Pp 404-411 (2018)
ISSN: 2376-6123
1674-2834
DOI: 10.1080/16742834.2018.1505405
Popis: This study investigates the major patterns of large-scale tilted ridges (LSTRS) over the Eurasian continent and their connections with large-scale surface air temperature during boreal winter. A total number of 134 LSTR events with zonal extent exceeding 90° of longitude on the peak day are identified. Using self-organizing map (SOM), the LSTRs are classified into five clusters that are characterized by different spatial distributions and orientations. The leading two clusters are closely associated with extensive and persistent cold events over different places. Considering the first cluster, LSTRs extend from the Ural Mountains to Northeast Asia and are favorable for the amplification and southeastward extension of the Siberian high. Therefore, this cluster is closely associated with the occurrence of extensive and persistent cold events in china. In comparison with the first cluster, the LSTRs of second group are situated to the west, with starting points from the Kola Peninsula, and cause extensive and persistent cold events over Eastern Europe, central Asia, and central Siberia. The results suggest that the vertical coupling between LSTRs and the corresponding anomalous sea level pressure is crucial for the persistent cold temperature events associated with the leading two SOM clusters.
Databáze: OpenAIRE
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