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Midtropospheric frontogenesis associated with antecedent indirect precipitation ahead of tropical cyclones over the Korean Peninsula

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Title
Midtropospheric frontogenesis associated with antecedent indirect precipitation ahead of tropical cyclones over the Korean Peninsula
Authors
Baek, Eun-Hyuk
Gyu-Ho Lim
Jong-Seong Kug
Kim, Joo-Hong
Keywords
Antecedent Indirect Precipitation; Midtropospheric Frontogenesis; TC-midlatitude interaction
Issue Date
2015
Citation
Baek, Eun-Hyuk, et al. 2015. "Midtropospheric frontogenesis associated with antecedent indirect precipitation ahead of tropical cyclones over the Korean Peninsula". TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY, 67(1): 27476-NaN.
Abstract
On the Korean Peninsula (KP), heavy rainfall often precedes the landfall of a tropical cyclone (TC). This rainfall is called antecedent indirect precipitation (AIP), because it occurs well beyond the effective radius of the TC. The present study examines the statistical characteristics and physical mechanism of the AIP produced by TCs that influenced on the KP during the period 1993-2004. Composite analyses demonstrate that the AIP events were accompanied by midtropospheric frontogenesis due to the TC-midlatitude environment interaction. When an approaching TC encountered an approaching midlatitude upper-level trough, this encounter resulted in confluent and deformed flows at the mid-level by the combination of westerlies from the trough and southerlies from the TC. The delicate balance of horizontal winds related to the two systems at the mid-level led to the midtropospheric frontogenesis to the north of the KP. The frontogenetic feature related to the AIP was in marked contrast to those of the remote rainfall event over the KP and the predecessor rainfall event over the United States suggested by previous studies. Quasi-geostrophic (QG) analysis demonstrates that the midtropospheric front induced thermally direct circulation, which led to ascending motion over the KP. Consequently, the midtropospheric front helped to intensify the AIP, together with the convective instability that was amplified by the transport of warm and moist air along the conduit between the TC and subtropical high.
URI
http://repository.kopri.re.kr/handle/201206/7346
DOI
http://dx.doi.org/10.3402/tellusa.v67.27476
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