Acta Geographica Sinica ›› 2016, Vol. 71 ›› Issue (7): 1119-1129.doi: 10.11821/dlxb201607003

• Simulation Research • Previous Articles     Next Articles

Analysis of the driving factors of PM2.5 in Jiangsu province based on grey correlation model

Xiang HE1,2,3(), Zhenshan LIN1,3(), Huiyu LIU1,3, Xiangzhen QI1,3   

  1. 1. College of Geography Science, Nanjing Normal University, Nanjing 210023, China
    2. Kaili University, Kaili 556011, Guizhou, China
    3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
  • Received:2016-02-25 Revised:2016-03-21 Online:2016-07-25 Published:2016-07-25
  • Supported by:
    National Natural Science Foundation of China, No.31470519;University Natural Science Major Project of Jiangsu Province in 2015;Natural Science Foundation of Jiangsu Province, No.BK20131399;The Priority Academic Program Development of Jiangsu Higher Institutions;Science and Technology Department Project of Guizhou Province, No.[2014]7237;Education Department Project of Guizhou Province, No.13GH004]

Abstract:

In this paper, the Kriging interpolation method was introduced to analyze the spatial distribution characteristics of PM2.5 in Jiangsu province in 2014, and then the evaluation index system for the PM2.5 was constructed, which consists of three index layers and 27 indexes. The grey correlation analysis method was used to explore the correlation between PM2.5 and its influencing factors. Finally, the relationship between the spatial distribution of PM2.5 and the main influencing factors was analyzed. The conclusions can be drawn as follows: (1) The PM2.5 in the coastal areas and the north is lower, while it is higher in the inland areas and the south. (2) The weight of PM2.5 pollution sources index layer is the largest (wi = 0.4691), the weight of the air quality index and meteorological elements layer is larger (wi = 0.2866), and the weight value of urbanization and industrial structure index layer is the minimum (wi = 0.2453). (3) In the 27 indexes, the volume of highway freight, housing construction area, garden green space area and population density have moderate correlation degrees. The other indexes have strong correlation degrees, among which, the correlation degree of the PM10, O3, total road freight volume and gross industrial output value are relatively high. (4) The synthetic correlation degree values between the PM2.5 pollution sources index layer and PM2.5 are much higher in cities of Nanjing, Wuxi, Changzhou, Nantong and Taizhou. The synthetic correlation degree values between urbanization and industrial structure index layer and PM2.5 are much higher in cities of Xuzhou, Suzhou, Yancheng and Changzhou. The synthetic correlation degree values between the air quality index and meteorological elements layer and PM2.5 are much higher in cities of Yancheng, Yangzhou, Changzhou and Nantong. Our results demonstrate that the grey correlation degrees of the evaluation indexes system are closely related with spatial distribution of PM2.5 in Jiangsu province. Therefore, the grey correlation analysis model can be employed to analyze and evaluate the spatial distribution of PM2.5.

Key words: grey correlation model, the spatial distribution of PM2.5, influencing index, Jiangsu province