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http://dx.doi.org/10.14191/Atmos.2017.27.3.277

Analysis of Characteristics for 2016 Changma Rainfall  

Kim, Jin-Yong (Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University)
Seo, Kyong-Hwan (Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University)
Yeh, Sang-Wook (Department of Marine Sciences and Convergence Technology, Hanyang University)
Kim, Hyun-Kyung (Korea Meteorological Administration)
Yim, So-Young (Korea Meteorological Administration)
Lee, Hyun-Soo (Korea Meteorological Administration)
Kown, MinHo (Ocean Circulation and Climate Research Center, Korea Institute of Ocean Science and Technology)
Ham, Yoo-Geun (Department of Oceanography, Chonnam National University)
Publication Information
Atmosphere / v.27, no.3, 2017 , pp. 277-290 More about this Journal
Abstract
Characteristics of precipitation in South Korea during the 2016 Changma period (6/18~7/30) are analyzed in great details. El $Ni{\tilde{n}}o$-induced tropical Indian Ocean (IO) basin-wide warming lasts from spring to early summer and induces the western North Pacific subtropical high (WNPSH) circulation anomaly through an equatorial Kelvin wave during the 2016 Changma period. Along the northern edge of the WNPSH, strong precipitation occurred, in particular, over eastern China and southern Japan. During the Changma period, South Korea had the near-normal mean precipitation amount (~332 mm). However, about 226 mm of rain fell in South Korea during 1 July to 6 July, which amounts to 67% of total Changma precipitation in that year. Upper-level synoptic migratory lows and low-level moisture transport played an essential role, especially from 1 July to 3 July, in triggering an abrupt development of fronts over the Korean Peninsula and the eastern continent China. The front over the eastern China migrates progressively eastward, which results in heavy rainfall over the Korean peninsula from 1 to 3 July. In contrast, from 4 to 6 July, the typhoon (NEPARTAK) affected an abrupt northward advance of the North Pacific subtropical high (NPSH). The northward extension of the NPSH strengthens the Changma front and induces the southerly flows toward the Korean peninsula, giving rise to an increase in heavy rainfall. The NEPARTAK is generated due to interaction of the Madden-Julian Oscillation (MJO), equatorial Rossby wave and Kelvin waves.
Keywords
Changma; precipitation; heavy rainfall; Changma front; NEPARTAK;
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