西安市PM2.5城乡差异及与城市热岛的关联研究
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国家自然科学基金资助项目(42222503;42075072)


The correlation between urban-rural PM2.5 difference and urban heat island intensity in Xi'an
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    摘要:

    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,将西安市环境与气象站点划分为城区、郊区和两类乡村站,讨论其PM2.5的城乡分布特征及与城市热岛效应强度(Urban Heat Island Intensity,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城乡分布特征和日变化特征,两类乡村站点PM2.5差异明显且下风向乡村站点(乡村D)对应的UHIID对城区和乡村的影响程度大于上风向乡村站点(乡村U)对应的UHIIU。在城区较多本地排放的影响下,乡村PM2.5浓度与 UHIIU(或UHIID)相关系数均大于城区。随着UHIID的增加,城乡PM2.5相对浓度差值(RUPIID)整体呈下降趋势且UHIID与RUPIID在春夏秋季显著负相关。UHIID增大,城区近地面PM2.5的水平扩散能力减弱,但PM2.5的垂直扩散能力较乡村更强,从而UHIID通过影响PM2.5的传输扩散特征,进一步影响西安市RUPIID

    Abstract:

    In this paper,the environmental meteorological stations in Xi'an are classified into urban,suburban,and two types of rural stations based on the proportion of construction land and the information entropy of land use.Following that,the urban-rural distribution characteristics of PM2.5 are then explored,as well as the correlation between the urban-rural PM2.5 concentration difference and the urban heat island effect intensity (UHII).Results show that the urban-rural distribution characteristics and the diurnal variation characteristics of PM2.5 in Xi'an vary with the season.The PM2.5 concentrations of the two types of rural stations are significantly different.Evidently,the correlation coefficients between UHIID and PM2.5 concentration of urban (rural D) stations are higher than those between UHIIU and PM2.5 concentration of urban (rural U) stations.Furthermore,because of more emissions,the correlation coefficients between UHIIU (UHIID) and PM2.5 concentration of rural stations are greater than those between UHIIU (UHIID) and PM2.5 concentration of urban stations.UHIID-RUPIID demonstrates a negative correlation in the spring,summer and autumn as UHIID increases,with the relative urban-rural PM2.5 concentration difference (RUPIID) showing a downward trend.In addition,the urban area's vertical diffusion capacity of PM2.5 is greater than its horizontal diffusion capacity the larger the UHIID.By changing the transmission and diffusion characteristics of PM2.5,UHIID further influences RUPIID in Xi'an.

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李煜斌,姜蕴聪,杨元建,张建彬,赵纯,高志球,2022.西安市PM2.5城乡差异及与城市热岛的关联研究[J].大气科学学报,45(6):904-916. LI Yubin, JIANG Yuncong, YANG Yuanjian, ZHANG Jianbin, ZHAO Chun, GAO Zhiqiu,2022. The correlation between urban-rural PM2.5 difference and urban heat island intensity in Xi'an[J]. Trans Atmos Sci,45(6):904-916.

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  • 收稿日期:2021-01-13
  • 最后修改日期:2021-02-24
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  • 在线发布日期: 2022-12-15
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