西安市PM2.5城乡差异与城市热岛强度的关联研究
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1.南京信息工程大学 大气物理学院;2.中国科学技术大学 地球与空间科学学院

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国家重点研发计划项目


The correlation between urban-rural PM2.5 difference and urban heat island intensity in Xi"an
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1.School of Atmospheric Physics,Nanjing University of Information Science &2.Technology,China;3.School of Earth and Space Sciences,University of science and Technology of China,China

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National Key R&D Program of China

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    摘要:

    本文依据一种基于建筑用地比例和土地利用信息熵的城乡站点划分方法,将西安市PM2.5与气温监测站点划分为城区、郊区和乡村站,讨论了其PM2.5的城乡分布特征及城区(或乡村)PM2.5浓度-城市热岛效应强度(UHII)间的相关关系。结果表明,不同季节西安市呈现不同的PM2.5城乡分布特征,城乡PM2.5浓度差值(ΔPM2.5)在春秋冬季为正而夏季为负。UHII恒为正且冬季最大,秋季最小,春夏季居中。西安市城区PM2.5-UHII相关系数(RURBAN)小于乡村PM2.5-UHII相关系数(RRURAL),且均呈秋高夏低,春冬居中的季节变化规律和上午、夜间时段显著正相关,下午时段负相关或不相关的日变化特征。特别得,RRURAL与RRURAL差值较大的时刻与城乡ΔPM2.5为负的时刻相对应。城区(或乡村)PM2.5-UHII的滞后性表现为夏季最晚,冬季最早且城区滞后性晚于乡村。

    Abstract:

    Based on the proportion of construction land and the information entropy of land use, PM2.5 monitoring stations and air temperature monitoring stations in Xi"an were divided into urban, suburban and rural stations. Following this, the urban-rural distribution characteristics of PM2.5 and the correlation between urban (rural) PM2.5 concentration and urban heat island effect intensity (UHII) were discussed. Results showed that the urban-rural distribution characteristics of PM2.5 in Xi’an were different in different seasons. PM2.5 concentration difference between urban and rural areas (ΔPM2.5) was positive in spring, autumn and winter, and negative in summer. However, UHII was always positive and had a maximum value in winter and a minimum value in autumn. The correlation coefficient between urban PM2.5-UHII (RURBAN) was smaller than that of rural PM2.5-UHII (RRURAL), and both of the value were the largest in autumn and the smallest in summer. Furthermore, urban (rural) PM2.5-UHII showed a significant positive correlation in the morning and night time, and a negative correlation or irrelevance in the afternoon. Particularly, the period when the difference between RRURAL and RURBAN is large was consistent with the period when urban-rural ΔPM2.5 is negative. The lag time of urban PM2.5-UHII is later than that of rural PM2.5-UHII, and both of the correlation coefficients are the latest in summer and the earliest in winter.

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  • 收稿日期:2021-01-13
  • 最后修改日期:2021-02-24
  • 录用日期:2021-03-04
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