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Bayesian change-point analysis is applied to detect a change-point in the occurrences of tropical night (TN) days in the 50-year time series data for five major cities in Republic of Korea. A TN day is simply defined as a day when the daily minimum temperature is greater than 25∘C. A Bayesian analysis is performed for detecting a change-point at an unknown time point in the TN day frequency time series, which ismodeled by an independent Poisson randomvariable.The results showed that a single change occurred around 1993 for three cities (Seoul, Incheon, andDaegu).However,whenwe excluded the extraordinary year, 1994, a single change occurred around 1993 only in Seoul and Daegu. The average number of TN days in Seoul and Daegu increased significantly, by more than 150%, after the change-point year. The abrupt increase in TN day frequency in two cities over Republic of Korea around 1993 may be related to the significant decadal change in the East Asian summer monsoon around the mid 1990s and to rapid urbanization.

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Park, C., S.-K. Min, D. Lee, d.-H. Cha, M.-S. Suh, H.-S. kang, S.-Y. Hong, D.-K. Lee, H.-J. Baek, K.-O. Boo and W.-T. Kwon, 2015: Evaluation of multiple regional climate models for summer climate extremes over East Asia. Clim Dyn, 2015,  
Suh, M.-S. and C. Kim, 2015: Change-Point Analysis of Tropical Night Occurrences for Five Major Cities in Republic of Korea. Advances in Meteorology, 2015, 1-11, doi:10.1155/2015/801981.  
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Ji-Woo Lee, Song-You Hong, Eun-Chul Chang, Myoung-Seok Suh, and Hyun-Suk Kang, 2013: Assessment of future climate change over East Asia due to the RCP scenarios downscaled by GRIMS-RMP, Climate Dynamics, soi:10.1007/s00382-013-1841-6.  
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Ju-Hee Park, Soek-Geun Oh, Myoung-Seok Suh, 2013: Impacts of boundary conditions on the precipitation simulation of RegCM4 in the CORDEX East Asia domain, JGR-Atmosphere, 118, 1-16p, doi:10.1002/jgrd.50159.  
Suh, M.-S., S.-G. Oh, D.-K. Lee, D.-H. Cha, S.-J. Choi, C.-S. Jin, and S.-Y. Hong, 2012, Development of new ensemble methods based on the performance skills of regional climate models over South Korea, J. of Climate,  
Kang, J.-H., M.-S., Suh, K.-O. Hong, and C.-S. Kim, 2011, Development of updateable model output statistics (UMOS) system for air temperature over South Korea, APJAS, 47(2), 199-211. RACS  
Hyo-Sik Eom and Myoung-Seok Suh, 2011, Seasonal and diurnal variations of stability indices and environmental parameters using NCEP FNL data over East Asia, APJAS, 47(2), 181-192. RACS  
Seo, Eun-Kyoung, Guosheng Liu, Myoung-Seok, Suh, and Byoung-Ju Sohn, 2010, The varying response of microwave signatures to different types of over land rainfall found over the Korean Peninsula, DOI:10.1175/2009/JTECHA1364.1,  
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