Effect Assessment of Air Quality Ensuring Measures during Beijing Olympic Games from Satellite...

Effect Assessment of Air Quality Ensuring Measures during Beijing

Olympic Games from Satellite Observation

Pucai Wang, Huan Yu, Zhaonan Cai, Xuemei Zong, Xiang’ao Xia, Yi Liu[1]Michel Roozendael[2]

1,Institute of Atmospheric Physics, Chinese Academy of Sciences2,Belgium Institute of Spatial Aeronomy

AMFIC Progress Meeting, Barcelona, 2009-06-24

Contents

2.1 Satellite monitoring and emission

reduction effect of NO2


reduction effect of SO2


reduction effect of AOD

2.7 CO change in Beijing


Outline of the Project led by Beijing EPB

Monitoring, Forecast, and Assessment of AQ

Ground-based Network Measurements

Satellite Monitoring （ NO2 ， SO2 ， AOD ） and Effect Assessment

Numerical Simulation

Emission Inventories

……


1 Goals of our Sub-project

During the extended period of Beijing Olympic

Games and Paralymic Games

to provide the spatial distribution of NO2, S

O2, and AOD;

to support the forecast of Air Quality, and

to assess the effect of the air quality ensurin

g measures.


Our main concerns were to provide the image

of the tropospheric NO2 column density, and

obtained the results of the emission reduction

assessment 。


（ 2.1 ） Satellite Monitoring of NO2 and Emission Reduction Assessment in Beijing

Phases of the Air Quality Ensuring Measures for the Olympic Games

07-01 08-01 09-01 09-2009-0608-0807-20 09-1708-24

End

50% vehicles restricted

High emission vehicles and heavy trucks restricted

company cars restricted by 50% ， increasing to 70% on July 1st

06-23

Shutdown or limited Production for many enterprises, prohibit biomass burning, etc.

Olympic Games Paralymic Games


According to the phases of the AQ ensuring measures, the reduction of NO2 are ：in Phase of high emission vehicles starting restriction（ 37.9% ），in Phase of Even/Odd restriction （ 46.2% ）， of Olympic Games （ 49.4% ）， Period of Paralymic Game （ 38% ）。

The mean value of 2005 ～ 2007 for the same periodMean Values of NO2 VCD during Beijing Olympic Games


Daily variation during the period of June to September of 2008. （ P1 ～ P4 denotes 4 phases ， P1 ，P2 are phases of vehicles restriction ， P3 ， P4 represent Olympic Games and Parametric Games ）

06-01 06-16 07-01 07-16 08-01 08-16 09-01 09-16 10-010

10

20

30

40

50

60T

rop

osp

her

ic N

O2 V

CD

(1015

mo

l/cm

2 )P1 P2 P3 P4

Beijing

Tianjin

Tangshan

data

OMI data

MaxDOAS measurements on the roof of IAP bu

ilding, 1km to the national stadium


In order to assess the effect of the AQ ensuring measures, NO2 during the t

he extended period of the Beijing Olympic Games and of the 20005-2007 w

ere analyzed.

Three methods were used for the effect assessment ：（ 1 ） Compared with 2005-2007 ， find the change in 2008 ；（ 2 ） Compared with neighbor metroplitan Tianjin and Tangshan,

find the difference ；（ 3 ） Compared with the ground-based MaxDOAS measuremen

t, find the change between the prior period and inside period of

the AQ ensuring measures.


Fig 14 The seasonal variation of tropospheric NO2 VCD of 20

08 in Beijing, Tianjin, and Tanshan

Fig 15 The seasonal variation of tropospheric NO2 VCD from

2005 to 2007 in Beijing, Tianjin, and Tangshan

1 2 3 4 5 6 7 8 9 10 11 125

10

15

20

25

30

35

40

45

month

Trop

osph

eric

NO

2 V

CD

(10

15m

ol/c

m2) 2008

Beijing

Tianjin

Tangshan

1 2 3 4 5 6 7 8 9 10 11 1210

15

20

25

30

35

40

month

Tro

posp

heric

NO

2 V

CD

(10

15m

ol/c

m2) 2005-2007

Beijing

Tianjin

Tangshan


with the phases of the measures, the assessment results are

Phase of starting the restriction of high emission vehicles （ 7.

1 — 7.19 ）， Trop NO2 VCD down 37.9% ； Phase of Even/Odd numbers （ 7.20 — 8.24 ）， down 46.2

% ； Olympic Games （ 8.8 — 8.24 ）， down 49.4% ； Paralymic Games （ 9.6 — 9.17 ）， down 38.0% 。


（ 2.1 ） Reduction Assessment of NO2

2.2 Satellite monitoring and emission reduction assessment of SO2

Fig 2. The mean SO2 VCDs during the Olympic Games (left)

and 2005 ～ 2007(right) 。


20082007-2009

2.2 Emission reduction of SO2

The same methods for NO2 were used for SO

2 emission reduction assessment.

58% reduction found in Beijing for trop. SO2 V

CD, and 40% in Tianjin and 48% in Tangshan,

during the extended period of the Olympic Ga

mes(July 1-Sep 20).


2.3 Satellite Monitoring and emission reduction of AOD

The AODs derived from MODIS data are provided.

18% reduction in AOD was found


Fig 10. The mean AOD in Northern China during the period of the Olymp

ic Games(August, September) for 2005 to 2008,respectively.

2005 2006

2007 2008


It is shown that the mean AOD of 2008 over

Beijing is remarkably less than those of the

other years. 18% reduction was found.


Fig 12. The satellite derived AODS in Beijing, Xianghe and Xinglong, validated by cimel sunphotometers’ measurements

北京站

00. 20. 40. 60. 8

11. 21. 41. 61. 8

2

08-1-1 08-1-31 08-3-1 08-3-31 08-4-30 08-5-30 08-6-29 08-7-29 08-8-28Date

AOD

MYD04AERONET

香河站

00. 20. 40. 60. 8

11. 21. 41. 61. 8

2

08-1-1 08-1-31 08-3-1 08-3-31 08-4-30 08-5-30 08-6-29 08-7-29 08-8-28Date

AOD

MYD04AERONET

兴隆站

00. 20. 40. 60. 8

11. 21. 41. 61. 8

2

08-1-1 08-1-31 08-3-1 08-3-31 08-4-30 08-5-30 08-6-29 08-7-29 08-8-28Date

AOD

MYD04AERONET


Xianghe Platform for Aerosol-Cloud-Radiation measurements （ September 2004 to Present ）

Fig 13, the seasonal variation of the tropospheric NO2 VCD for Beiji

ng, from 2005 to 2008.

1 2 3 4 5 6 7 8 9 10 11 125

10

15

20

25

30

35

40

45

50

month

Tro

po

sph

eri

c N

O2 V

CD

(10

15m

ol/c

m2)

2008

20052006

2007


Fig 14 The seasonal variation of tropospheric NO2 VCD of 20

08 in Beijing, Tianjin, and Tanshan

Fig 15 The seasonal variation of tropospheric NO2 VCD from

2005 to 2007 in Beijing, Tianjin, and Tangshan

1 2 3 4 5 6 7 8 9 10 11 125

10

15

20

25

30

35

40

45

month

Trop

osph

eric

NO

2 V

CD

(10

15m

ol/c

m2) 2008

Beijing

Tianjin

Tangshan

1 2 3 4 5 6 7 8 9 10 11 1210

15

20

25

30

35

40

month

Tro

posp

heric

NO

2 V

CD

(10

15m

ol/c

m2) 2005-2007

Beijing

Tianjin

Tangshan


2.7 CO seasonal variation in Beijing

The change of CO column amount from MOPITT

data.


The monthly variation of CO column amount of 2008 over nothern China region

Fig 4 Comparison of CO in 2008 with 2005-2007

It is shown that the CO column amount is similar to the

historical values before the ensuring measures, while it

decreases remarkably during the AQ ensuring measures

and the following month (August – October). This

decreasing trends still maintains until one month later

when the AQ ensuring measures ended.

1 2 3 4 5 6 7 8 9 10 11 122

2.2

2.4

2.6

2.8

3

month

CO

VC

D(1

01

8m

ol/c

m2)

2008

2005-2007

Fig 5. The MaxDOAS measurements for NO2 during the extended period of Beijing Olympic Games, collaborated with Belgium team

Site: on the roof of IAP main building

MAXDOAS

4 Conclusions

Provided the satellite data and analysis report

of NO2, SO2 and AOD;

Provided the effect assessment of air quality

ensuring measures during the extended

periods of the Olympic Games

Published a paper in Chinese Science Bulletin

(Chinese + English)


Thanks ！

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