DISTRIBUTION CHARACTERISTICS AND DIFFERENCE ANALYSIS OF PM<sub>2.5</sub> BASED ON WAVELET ANALYSIS

SU Ming-wei; ZHANG Wei-feng; ZHENG Run-he

doi:10.13205/j.hjgc.202105013

Volume 39 Issue 5

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(5): 96-103

SU Ming-wei, ZHANG Wei-feng, ZHENG Run-he. DISTRIBUTION CHARACTERISTICS AND DIFFERENCE ANALYSIS OF PM2.5 BASED ON WAVELET ANALYSIS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 96-103. doi: 10.13205/j.hjgc.202105013

Citation:

SU Ming-wei, ZHANG Wei-feng, ZHENG Run-he. DISTRIBUTION CHARACTERISTICS AND DIFFERENCE ANALYSIS OF PM_2.5 BASED ON WAVELET ANALYSIS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 96-103. doi: 10.13205/j.hjgc.202105013

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DISTRIBUTION CHARACTERISTICS AND DIFFERENCE ANALYSIS OF PM_2.5 BASED ON WAVELET ANALYSIS

doi: 10.13205/j.hjgc.202105013

1. School of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013, China;
2. School of Economics and Management, Baoji University of Arts and Sciences, Baoji 721013, China

Received Date: 2020-08-19
Available Online: 2022-01-17

Abstract

Abstract

To understand the characteristics and differences of PM_2.5 concentration in the northwest inland and east coast, this paper used wavelet analysis and Spearman correlation analysis to compare the distribution characteristics and differences of PM_2.5 concentration values in 12 major cities in winter and spring. The results showed that, affected by differences in geographic location and topography, the concentration of PM_2.5 was significantly different in the northwest inland and east coastal cities. The results mainly manifested in:1) the distribution of PM_2.5 in the northwest inland and the eastern coastal areas was significantly different in winter and spring. The east Coastal areas were better than the northwest inland areas, while the east coastal areas had relatively low excess rates. Urumqi and Xi'an accounted for a relatively high percentage of excesses; 2) Wavelet analysis showed that the northwest inland and the east coast possessed obvious differences in cycle, but the overall appearance occurred in winter (before 80 d); 3) The Spearman correlation coefficient had obvious distance attenuation, and the correlation coefficient weakened from the northwest inland to the coastal cities in the east; 4) The abrupt changes of PM_2.5 concentration values in the east and northwest were significantly different on time scales. The overall abrupt changes in the northwestern inland areas appeared on the 2nd, 11th, 24th, 49th, and 70th day, and the eastern coastal areas appear on 2nd, 17th, 42th, 53th, 70th day.
- PM_2.5,
- wavelet coefficient,
- difference,
- distribution characteristics

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References(31)

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