Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Meteorological Characteristics in the Ulsan Metropolitan Region: Focus on Air Temperature and Winds

울산지역의 기상 특성: 기온과 바람을 중심으로

  • Oh, Inbo (Environmental Health Center, University of Ulsan College of Medicine) ;
  • Bang, Jin-Hee (Environmental Health Center, University of Ulsan College of Medicine) ;
  • Kim, Yangho (Department of Occupational & Environmental Medicine, University of Ulsan College of Medicine)
  • 오인보 (울산대학교 의과대학 환경보건센터) ;
  • 방진희 (울산대학교 의과대학 환경보건센터) ;
  • 김양호 (울산대학교 의과대학 직업환경의학교실)
  • Received : 2014.12.22
  • Accepted : 2015.04.07
  • Published : 2015.04.30
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Abstract

Spatial-temporal meteorological features of the Ulsan metropolitan region (UMR) were analyzed using observations and high-resolution numerical modeling. Long-term trend analysis (1970~2013) showed a significant increase of $0.033^{\circ}Cyr^{-1}$ in the 5-year moving average temperature, although detailed short-term features varied, whereas wind speed and relative humidity over the same period displayed clear decreases of $-0.007ms^{-1}$ and $-0.29%yr^{-1}$, respectively. These trends indicate the effects of regional climate change and urbanization in the UMR. Seasonal variations averaged for the most recent three years, 2011~2013, showed that temperatures in three different regions (urban/industrial, suburban, coastal areas) of the UMR had similar seasonality, but significant differences among them were observed for a certain season. Urban and industrial complex regions were characterized by relatively higher temperatures with large differences (max.: $3.6^{\circ}C$) from that in the coastal area in summer. For wind speed, strong values in the range from 3.3 to $3.9ms^{-1}$ occurred in the coastal areas, with large differences clearly shown between the three regions in September and October. Diurnal variations of temperature were characterized by pronounced differences during the daytime (in summer) or nighttime (in winter) between the three regions. Results from the WRF modeling performed for four months of 2012 showed large variations in gridaverage temperature and winds in the UMR, which displayed significant changes by season. Especially, a clear temperature rise in the urban center was identified in July ($0.6^{\circ}C$ higher than nearby urban areas), and overall, relatively weak winds were simulated over urban and inland suburban regions in all seasons.

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References

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