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

机译：首尔城市热岛强度的统计和动态特征

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摘要

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℃) and weakest in summer (3.5℃). 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.
机译：使用4年的地面气象数据（间隔1小时），对首尔市的非降水日和降水日的城市热岛（UHI）强度进行统计和动态分析。此外，使用天气条件聚类方法研究了天气压力模式对UHI强度的定量影响。统计分析表明，首尔非降水日的每日最大UHI强度在秋季（4.8℃）最强，在夏季（3.5℃）最弱。除冬季在08 LST附近发现最大出现频率外，所有季节都在午夜前后观察到每日最大UHI强度。这意味着在寒冷季节，人为加热会导致UHI。 UHI强度的发生频率在非降水日呈负偏斜分布，而在降水日呈正偏斜分布。降水日的所有季节中，加热/冷却速率的幅度以及城乡之间的加热/冷却速率的差异要小于非降水日，导致降水日的UHI强度较弱。城市酷岛在白天经常发生，其发生频率占春季非降水总天数的77％。对大规模动力强迫影响的分析表明，相对于季节平均每日最大UHI强度，日最大UHI强度随天气压力模式而变化，从春季的-22％到夏季的28％不等。使用站平均温度计算的UHI强度与基于常规两站方法的UHI强度的比较表明，通过使用多站数据可以将对UHI强度的局部影响最小化。因此，建议使用城市和农村地区的站平均温度估算UHI强度。

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  • 来源
    《Theoretical and applied climatology》 |2010年第2期|227-237|共11页
  • 作者

    Sang-Hyun Lee; Jong-Jin Baik;

  • 作者单位

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

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

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