Integrated Analysis on Spatial Distribution Characteristics of PM<sub>10</sub> Concentration Based on Variational Processing Method in Beijing

Cheng Xinghong; Xu Xiangde; Chan Chuenyu; Ding Guoan; Li Chengcai; Weng Yonghui

Vol.18, NO.2, 2007

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2007 > 18(2): 165-172

Cheng Xinghong, Xu Xiangde, Chan Chuenyu, et al. Integrated analysis on spatial distribution characteristics of PM10 concentration based on variational processing method in Beijing. J Appl Meteor Sci, 2007, 18(2): 165-172.

Citation:

Cheng Xinghong, Xu Xiangde, Chan Chuenyu, et al. Integrated analysis on spatial distribution characteristics of PM₁₀ concentration based on variational processing method in Beijing. J Appl Meteor Sci, 2007, 18(2): 165-172.

Citation:

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Integrated Analysis on Spatial Distribution Characteristics of PM₁₀ Concentration Based on Variational Processing Method in Beijing

1.
Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Graduate University, Chinese Academy of Sciences, Beijing 100039
3.
Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong
4.
Department of Atmospheric Science, School of Physics, Peking University, Beijing 100871

Received Date: 2005-11-21
Rev Recd Date: 2006-10-18
Publish Date: 2007-04-30

Abstract

Abstract

A study is carried out on the spatial distribution characteristics of PM₁₀ mass concentration and effect of pollutants from motor vehicle emissions in the main streets, the ring roads which are located in urban districts and suburbs in Beijing, based on the integrated Atmospheric Pollution Field Experiments (BECAPEX, Beijing City Atmospheric Pollution Experiment) and variational processing methods by satellite retrieval data whose horizontal resolution is 1 km. The results show that PM₁₀ mass concentration in the majority of urban area are low, especially in ancient building communities which are located inside the Second Ring Road and in large afforestation zone. High concentration areas of PM₁₀ in suburb distribute along ring roads, and pollutions are much serious in the southwest, the south and the northeast of the suburbs. The above mentioned fact shows that the impact of vehicle emissions on PM₁₀ concentration is very serious in blocks which are located in urban districts and suburbs. Before satellite retrieval data are corrected by variational processing method, the value of MODIS AOD (Aerosol Optical Depth) in urban districts and suburbs are much higher than that in exurb, there are inveracious high value areas of AOD in its spatial distribution field and its unsymmetrical spatial distribution characteristics is not obvious. AOD values in most exurbs are lower than that in urban districts and suburbs, especially in the northwest of the exurb. But AOD values in the southwest and the southeast of the exurb are relatively high. The remarkable corrected effect is obtained by using a point plane integrated observation research technique and variational processing method by MODIS AOD retrieval data and corresponding observation data on the ground. AOD variational field with higher resolution information could be used to describe unsymmetrical spatial distribution characteristics in urban district and suburb detailedly, especially in exurb. This method can be used to make up the limitation of observation in exurbs. After satellite retrieval data are corrected by variational processing method, unsymmetrical spatial distribution char acteristics of AOD value are more distinct and conformed with that of PM₁₀ concentration. Inveracious high value areas of AOD distribution are removed. Orbicular distribution of AOD in near suburb is more obvious and its unsymmetrical distribution characteristics in exurbs are also more notable. The location and intensity of the above high and low AOD value areas are stable accordingly.
- vehicle emissions;
- PM₁₀;
- aerosol optical depth;
- variational processing method

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References(22)

Figures and Tables

图 1 “两轴”垂直剖面观测试验动态采样点示意图

Fig. 1 Location of ambulatory sampling points in the vertical section observation experiment

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图 2 Dust Trak采样仪与TEOM采样仪PM₁₀浓度的对比标定

Fig. 2 Scatter diagrams for PM₁₀ concentration sampled by Dust Trak and TEOM

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图 3 2003年10月15—16日北京地区动态采样点(每天约120个)PM₁₀浓度与AOD的相关分析

Fig. 3 Scatter diagrams for PM₁₀ concentration sampled at ambulatory sampling points and AOD value on Oct 15—16, 2003

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图 4 2003年9月10日和10月14—16日09 : 30—11 : 00北京地区地面动态观测PM₁₀浓度(单位: mg·m^-3)的空间分布特征

Fig. 4 Spatial distribution characteristics of PM₁₀ concentration sampled at ambulatory sampling points on Sep 10, Oct 14—16, 2003(unit: mg·m^-3)

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图 5 2003年9月10日和10月15日北京地区变分订正前后MODIS AOD空间分布场

(a)9月10日订正前,(b)9月10日订正后,(c)10月15日订正前,(d)10月15日订正后

Fig. 5 Spatial distribution characteristics of original AOD retrieval data and AOD value processed by variational method in Beijing on Sep 10 and Oct 15, 2003

(a)original AOD retrieval data on Sep 10,(b)AOD variational value on Sep 10,(c)original AOD retrieval data on Oct 15,(d)AOD variational value on Oct 15

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表 1 2003年9月10日和10月13—16日北京市南郊观象台各时次云量

Table 1 Hourly cloud amount observed in Beijing South Observatory during 09 : 00—12 : 00, on Sep 10 and Oct 13—16, 2003

表 2 2003年9月10日, 10月14—16日北京地区实测PM₁₀浓度超标情况

Table 2 Superscale of PM₁₀ concentration observed in Beijing on Sep 10 and Oct 14—16, 2003

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