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Dipole structure of interannual variations in summertime tropical cyclone activity over East Asia

Title
Dipole structure of interannual variations in summertime tropical cyclone activity over East Asia
Authors
Kim J.-H.Ho C.-H.Sui C.-H.Park S.K.
Ewha Authors
박선기
SCOPUS Author ID
박선기scopus
Issue Date
2005
Journal Title
Journal of Climate
ISSN
0894-8755JCR Link
Citation
Journal of Climate vol. 18, no. 24, pp. 5344 - 5356
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The present study examines variations in summertime (July-September) tropical cyclone (TC) activity over East Asia during the period 1951-2003. To represent TC activity, a total of 853 TC best tracks for the period were converted to TC passage frequencies (TPFs) within 5° × 5° latitude-longitude grids; TPFs are defined as the percentage values obtained by dividing the number of TC appearances in each grid box by the total number of TCs each year. Empirical orthogonal function analysis of the TPF showed three leading modes: two tropical modes that represent the long-term trend and the relationship with ENSO and one midlatitude mode that oscillates between south of Korea and southeast of Japan with an interannual time scale. The latter proved to be the most remarkable climatic fluctuation of summertime TC activity in the midlatitudes and is referred to as the East Asian dipole pattern (EADP) in this paper. Anomalous atmospheric flows directly connected to the EADP are an enhanced anticyclonic (cyclonic) circulation centering around Japan when the TPF is high south of Korea (southeast of Japan), thereby showing an equivalent barotropic structure in the entire troposphere. This regional circulation anomaly varies in conjunction with the zonally oriented quasi-stationary Rossby wave train in the upper troposphere. This wave train is meridionally trapped in the vicinity of the summer-mean jet stream; therefore, the mean jet stream alters its internal meandering structure according to the phase of the wave train. © 2005 American Meteorological Society.
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DOI
10.1175/JCLI3601.1
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엘텍공과대학 > 환경공학전공 > Journal papers
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