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http://dx.doi.org/10.5467/JKESS.2010.31.4.322

Distribution of Precipitation on the Korean Peninsula Associated with the Weakening of Tropical Cyclones  

Hwang, Ho-Seong (Department of Environmental Atmospheric Sciences, Pukyong National University)
Byun, Hi-Ryong (Department of Environmental Atmospheric Sciences, Pukyong National University)
Lee, Sang-Min (Department of Environmental Atmospheric Sciences, Pukyong National University)
Choi, Ki-Seon (National Typhoon Center)
Lee, Ji-Sun (Department of Environmental Atmospheric Sciences, Pukyong National University)
Publication Information
Journal of the Korean earth science society / v.31, no.4, 2010 , pp. 322-334 More about this Journal
Abstract
Spatiotemporal characteristics of precipitation in Korea, associated with the weakening of Tropical Cyclones (TCs) around the Korean Peninsula ($32-36^{\circ}N$, $122-132^{\circ}E$) over the last 30 years (1979-2008), were investigated. Weakened TCs are classified as WEC (Weakened to Extratropical Cyclone) and WTD (Weakened to Tropical Depression). In WEC, precipitation was evenly distributed all over the Korean Peninsula and the greater precipitation was recorded in the southern coast. In WTD, the most precipitation was recorded in the southern coast but low precipitation was recorded in the central and inland areas of Korea. The difference of precipitation between WEC and WTD was not statistically significant in Region 2 (Jeollanam-do, Gyeongsangnam-do, southeastern part of Gyeongsangbuk-do, Jeju-do); however, the precipitation resulting from WEC was greater than that resulting from WTD in Region 1 (central area of Korea, Jeollabuk-do, inland of Gyeongsangbuk-do). In WEC, the developed upper-level potential vorticity (PV) and low-level temperature trough shifted to the northwest of TCs approaching Korea. In addition, an upper-level jet stream and strong divergence field were observed to the northeast of the TCs. It was assumed that these meteorological factors had induced baroclinic instability and diabatic process, which created a large precipitation area around the TCs. However, the intense PV, temperature trough, jet stream were not observed in WTD, which created a small precipitation area around the TCs.
Keywords
tropical cyclones; extratropical transition; upper level divergence; distribution of precipitation;
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