Computer Science
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ijcli..18.1209k&link_type=abstract
International Journal of Climatology, vol. 18, Issue 11, pp.1209-1221
Computer Science
4
Cold Air Outbreak, Synoptic Climatology, Winter Circulation, Eastern United States
Scientific paper
Previous work has shown that the intensity of cold air outbreaks over the south-eastern US displays a stronger relationship with planetary scale circulation anomalies than with the synoptic scale anomalies that are directly associated with the outbreak. In this study, these planetary scale circulations are identified over three temporal scales and related to outbreak intensity. To carry this out, standardized 5, 10, and 15 day surface pressure and 500 mb heights over North America are used to identify a sample of 57 circulation periods. From this sample, the circulation anomalies identified on the three scales are related to the intensity of current and incipient (i.e. 1-2 weeks later) outbreak activity over the south-eastern US. Correlation maps are constructed to portray the patterns of correlation between the circulation anomalies and outbreak intensity. In order to investigate regional variability in the nature of the relationships, comparisons are made with outbreak activity over the north-eastern US.The majority of the circulation features show stronger relationships with outbreak intensity when the 10- and 15-day mean circulations are considered. This implies that persistent, lower frequency modes of circulation play a relatively greater role in controlling the intensity of cold air outbreaks over the eastern US.
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