西安市热岛效应与污岛效应的相互作用研究

doi:10.13866/j.azr.2022.06.07

Abstract

Abstract:

Surface/Canopy Urban Heat Island (SUHI/CUHI) effect and Atmospheric/Near-surface Urban Pollution Island (AUPI/NSUPI) effect interact and influence each other, significantly threatening the urban ecological environment. Based on the spatial coupling analysis and attribution method, the impact of AUPI on SUHI under radiation effect and CUHI on NSUPI under turbulence mixing in Xi’an city from 2003 to 2020 were explored using land surface temperature, air temperature, Aerosol Optical Depth (AOD), and PM_2.5 data. The results indicated that: (1) Due to the difference in aerosol radiation effect between day and night in winter, SUHI intensity in winter is <0.2 K. The strong aerosol radiation cooling effect causes low ground temperature in urban areas and cooler in urban areas than in rural areas. When the SUHI intensity is greater than 2.2 K at night, the long-wave radiation effect of aerosol is enhanced, and the pollutant particles suspended in the urban space become the “insulation layer” of the city. (2) Significant CUHI in spring and summer enhanced atmosphere turbulent mixing, causing the diffusion of pollutant particles near the surface in urban regions. PM_2.5 concentration and NSUPI intensity decreased correspondingly on urban surfaces. In autumn and winter, the atmospheric inversion layer obstructed air ascending movement driven by the CUHI effect. PM_2.5 particles aggregated and accumulated in near-surface urban areas, and NSUPI was enhanced accordingly. Additionally, the contribution of haze to surface heat island by attribution quantitative analysis suggested that AOD in rural or urban areas was significantly negatively correlated with SUHI at night and correlation coefficients were -0.431 and -0.386, respectively. This suggested that the main radiation effect of haze on the surface heat environment at night was the cooling effect, while the weakening or strengthening effect of haze on the local climate of urban heat islands was mainly attributed to the positive or negative difference in AOD in urban and rural areas. The UHI and UPI effects are inseparable. It is very important to promote the comprehensive study of urban climate and pollution for constructing a green urban ecological environment.

Key words: Xi’an, surface/canopy urban heat island, atmospheric/near-surface pollution island, spatial coupling analysis, attribution method

JIANG Ziqi,WANG Xuhong,FENG Zihao,CUI Siying,YANG Xia. Exploring the interaction between the heat island effect and pollution island effect in Xi’an, China[J].Arid Zone Research, 2022, 39(6): 1768-1781.

Figures/Tables 11

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UHII & UPII	春季	夏季	秋季	冬季	年平均
SUHII_day/K	3.232	3.041	0.957	-0.767	1.66
SUHII_night/K	3.482	2.779	2.685	3.380	3.078
CUHII/K	1.016	0.529	0.558	0.794	0.723
AUPII	-0.020	0.043	0.047	-0.004	0.017
NSUPII/（μg·m^-3）	2.274	-1.260	1.666	3.015	1.394

UHI/UPI耦合对	季节	城市区	乡村区	城乡耦合性差异
SUHI_day& AUPI	春季	0.8669	0.851	0.0159
	夏季	0.9149	0.8624	0.0525
	秋季	0.9431	0.9052	0.0379
	冬季	0.8919	0.9043	-0.0124
SUHI_night& AUPI	春季	0.8842	0.8525	0.0317
	夏季	0.9168	0.8578	0.059
	秋季	0.9423	0.8734	0.0689
	冬季	0.9135	0.854	0.0595
CUHI & NSUPI	春季	0.9524	0.9107	0.0417
	夏季	0.9587	0.9551	0.0036
	秋季	0.9606	0.9382	0.0224
	冬季	0.9462	0.9126	0.0336

AOD	白天SUHI	夜晚SUHI
城市AOD	0.002	-0.431^**
乡村AOD	-0.001	-0.386^**

Exploring the interaction between the heat island effect and pollution island effect in Xi’an, China

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