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Statistical and dynamical characteristics of the urban heat island intensity in Seoul

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Abstract

The statistical and dynamical characteristics of the urban heat island (UHI) intensity in Seoul are investigated for non-precipitation days and precipitation days using 4-year surface meteorological data with 1-h time intervals. Furthermore, the quantitative influence of synoptic pressure pattern on the UHI intensity is examined using a synoptic condition clustering method. The statistical analysis shows that the daily maximum UHI intensity in Seoul for non-precipitation days is strongest in autumn (4.8°C) and weakest in summer (3.5°C). The daily maximum UHI intensity is observed around midnight in all seasons except in winter when the maximum occurrence frequency is found around 08 LST. This implies that anthropogenic heating contributes to the UHI in the cold season. The occurrence frequency of the UHI intensity has a negatively skewed distribution for non-precipitation days but a positively skewed distribution for precipitation days. The amplitude of the heating/cooling rate and the difference in the heating/cooling rate between the urban and rural areas are smaller in all seasons for precipitation days than for non-precipitation days, resulting in weaker UHI intensities for precipitation days. The urban cool island occurs very often in the daytime, with an occurrence frequency being 77% of the total non-precipitation days in spring. The analysis of the impact of large-scale dynamical forcing shows that the daily maximum UHI intensity varies with synoptic pressure pattern, ranging from −22% in spring to 28% in summer relative to the seasonal mean daily maximum UHI intensity. Comparison of the UHI intensity calculated using station-averaged temperatures to that based on the conventional two-station approach indicates that local effects on the UHI intensity are minimized by using multiple-station data. Accordingly, an estimation of the UHI intensity using station-averaged temperatures for both urban and rural areas is suggested.

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Acknowledgments

The authors are very grateful to two anonymous reviewers for providing valuable comments on this paper. This work was funded by the Korea Meteorological Administration Research and Development Program under Grant CATER 2006-2202.

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  1. School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, South Korea

    Sang-Hyun Lee & Jong-Jin Baik

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  1. Sang-Hyun Lee
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Correspondence to Jong-Jin Baik.

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Lee, SH., Baik, JJ. Statistical and dynamical characteristics of the urban heat island intensity in Seoul. Theor Appl Climatol 100, 227–237 (2010). https://doi.org/10.1007/s00704-009-0247-1

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