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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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Youn-Young Choi, Myoung-Seok Suh and Ki-Hong Park, 2014: Assessment of Surface Urban Heat Islands over Three Megacities in East Asia Using Land Surface Temperature Data Retrieved from COMS, Remote Sens. 2014, 6, 5852-5867; doi:10.3390/rs6065852  
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,  
Suh, M.-S. and S.-G. Oh, 2015: Impacts of boundary conditions on the simulation of atmospheric fields using RegCM4 over CORDEX East Asia. Atmos., 6, 783–804.  
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.  
Suh, M.-S et al, Projections of High Resolution Climate Changes for South Korea Using Multiple-Regional Climate Models Based on Four RCP Scenarios. Part 1: Surface Air Temperature. APJAS, 52(2), 151-169  
Seok-Geun Oh, Myoung-Seok Suh, and Dong-Hyun Cha, 2013: Impact of Boundary Conditions on Precipitation and Temperature Extremes over South Korea in the CORDEX Regional Climate Simulation Using RegCM4, APJAS, 49(4), 497-509,  
Seok-Geun Oh, Ju-Hee Park, Sang-Hyun Lee, and Myoung-Seok Suh, 2014: Assessment of the RegCM4 over East Asia and future precipitation change adapted to the RCP scenarios, JGR-Atmosphere, 119, doi:10.1002/ 2013JD020693.  
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,  
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,  
Oh, S.-G et al. Projection of high resolution climate change for South Korea using multiple-regional climate models based on four RCP scenarios. Part 2: Precipitation. APJAS, 52(2), 171-189  
Myoung-Seok Suh and Dong-Kyou Lee, 2004: Impacts of land use/cover changes on surface climate over east Asia for extreme climate cases using RegCM2. J. Geophys. Res., 109, D02108  
Kim, Chansoo, Suh, Myoung-Seok, Hong, Ki-Ok, 2009: Bayesian Changepoint Analysis of the Annual Maximum of Daily and Subdaily Precipitation over South Korea, J. Climate, DOI:10.1175/2009JCLI2800.1, 22, 6741-6757  
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  
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.  
Jin, C.-S, D.-H. Cha, D.-K. Lee, M.-S. Suh, S.-Y. Hong, H.-S. Kang and C.-H. Ho, 2015: Evaluation of climatological tropical cyclone activity over the western North Pacific in the CORDEX‑East Asia multi‑RCM simulations. Clim Dyn,  
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.  
Hyo-Sik Eom, Myoung-Seok Suh, Jong-Chul Ha, Yong Hee Lee, and Hee-Sang Lee, 2008: Climatology of Stability Indexes and Environmental Parameters Derived from Rawinsonde Data over South Korea. APJAS, 44, 269-286.  
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  
Hong, K.-O., M.-S., Suh, and j.-H. Kang, 2009: Development of a land surface temperature retrieval algorithm from MTSAT-1R data. APJAS, 45, 411-422.  
Fu, C.B., S. Y. Wang, Z. Xiong, W. J. Gutowski, D.-K.Lee, J. L. McGregor, Y. Sato, H. Kato, J.-W.Kim, and M.-S.Suh, 2005: Regional Climate Model Intercomparison Project for Asia (RMIP), Bull. Am. Meteorol. Soc., 86(2), 257-266.  

Meteorological Satellite Research Lab.
Department of Atmospheric Science Konju National University
56, Gongjudaehak-ro, Gongju-si, Chungcheongnam-do, Korea
TEL : +82-41-850-8533 l E-mail : sms4@kongju.ac.kr

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