Classification of Heat Wave Events in Seoul Using Self-Organizing Map

• DOI: 10.15531/ksccr.2018.9.3.209
• Publication Date: 2018-10-12T00:19:09Z
• Authors: Seung-Yoon Back; Sang-Wook Kim; Myung-Il Jung; Joon-Woo Roh; Seok-Woo Son
• Keywords: Peninsula; Atmospheric Circulation; Heat wave; Synoptic scale meteorology; Cold wave; Global wind patterns

The characteristics of heat wave events in Seoul are analyzed using weather station data from Korea Meteorological Administration (KMA) and European Centre for Medium‐Range Weather Forecast (ECMWF) ERA‐Interim reanalysis 1979 to 2016. Heat waves defined as the upper 10th percentile daily maximum temperatures. associated synoptic patterns then classified into six clusters through Self‐Organizing Map (SOM) analysis sea‐level pressure anomalies East Asia. Cluster 1 shows an anti‐cyclonic circulation weak troughs southeast west Korea, respectively. This pattern leads southeasterly winds that advect warm moist air Korean Peninsula. Both 2 3 with southerly formed by over east cyclonic Korea. 4 a stagnant strong insolation. Clusters 5 6 Föhn wind resulting north In terms long‐term variations, event frequencies show increasing decreasing trends, However, other do not any indicating mechanisms drive have remained constant last four decades.