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http://dx.doi.org/10.3741/JKWRA.2013.46.2.123

Different Impacts of the Two Phases of El Niño on Variability of Warm Season Rainfall and Frequency of Extreme Events over the Han River Basin  

Yoon, Sun-Kwon (Climate Change Research Team, Climate Research Department, APEC Climate Center)
Kim, Jong-Suk (Department of Civil Engineering, The University of Seoul)
Kwon, Hyun-Han (Department of Civil Engineering, Chonbuk National University)
Publication Information
Journal of Korea Water Resources Association / v.46, no.2, 2013 , pp. 123-137 More about this Journal
Abstract
This study investigated impacts of the two different types of El Ni$\tilde{n}$o on summer rainfall (June-September) in the Han River and its sub-basins. The patterns of rainfall anomalies show a remarkable difference between conventional El Ni$\tilde{n}$o and El Ni$\tilde{n}$o Modoki years. During conventional El Ni$\tilde{n}$o years, it was found that the Han River basins show decreases in the seasonal rainfall totals with high variations (CV=0.4). In contrast, during El Ni$\tilde{n}$o Modoki years, distinct positive anomalies appear in the Han River basin with a relatively small variation (CV=0.23). In addition, 11 out of 30 sub-basins show significant above-normal rainfall in southern part of the Han River Basin. For El Ni$\tilde{n}$o Modoki years, the number of heavy rainy days exceeding 30 mm/day and 50 mm/day were 9.9-day and 5.4-day, respectively. Consequently, this diagnostic study confirmed that El Ni$\tilde{n}$o Modoki has significant impacts on the variability of summer rainfall over the Han River Basin. We expect the results presented here provide useful information for the stability of the regional water supply system, especially for basins like the Han River Basin showing relatively high variability in seasonal rainfall.
Keywords
El Ni$\tilde{n}$o; El Ni$\tilde{n}$o Modoki; summer rainfall; extreme rainfall; Han River Basin;
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