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Sources and Formation of Organic Aerosol: Insights from ...
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Sources and Formation of Organic Aerosol: Insights from UCAS Winter and PKU Summer Campaigns in Beijing Qi Chen , Xi Cheng, Yan Zheng, Yaowei Li, John Nowark, Douglas Worsnop, Tong Zhu Aerodyne AMS/CIMS User Meeting hosted by PKU 2017-05-08
Transcript of Sources and Formation of Organic Aerosol: Insights from ...
Sources and Formation of Organic Aerosol: Insights from UCAS Winter and PKU Summer Campaigns in Beijing
Qi Chen, Xi Cheng, Yan Zheng, Yaowei Li, John Nowark, Douglas Worsnop, Tong Zhu
Aerodyne AMS/CIMS User Meeting hosted by PKU
2017-05-08
UCAS Winter Campaign: Haze Events in North China Plain
UCAS
60 km
Beijing
January to March, 2016
Scientific Focus:
• OH HO2 RO2 Radical Chemistry
• New Particle Formation
• Aerosol Chemistry
(Gaseous vs Heterogeneous)
• Background vs. Urban Haze Plume
Aerodyne-PKU Collaboration: Nitrate-Ion Chemical Ionization Time-of-Flight Mass Spectrometer (NO3-TOF-CIMS)
PKU Summer Campaign: Haze Events in North China Plain
August to October, 2016
Scientific Focus:
• OH HO2 RO2 Radical Chemistry
• New Particle Formation
• Aerosol Chemistry
(Gaseous vs Heterogeneous)
• Stronger Photochemistry
PKU roof site
NO3-ToF-CIMS
PTR-QiToF
PM2.5 / PM1 Switching Sampling by TOF-ACSM
for a short period
PM2.5 intercomparisons
600
500
400
300
200
100
0
NR
-PM
2.5
(µ
g/m
3)
806040200
OC (µg/m3)
Slope = 2.58(Intercept = 2.04)r = 0.96
200150100500
NR-PM2.5
250
200
150
100
50
0
NR
-PM
2.5
by T
OF
-AC
SM
(µ
g/s
m3)
250200150100500
PM2.5 by TEOM (µg/sm3)
Slope = 0.82r = 0.93
80
60
40
20
0
NR
-PM
2.5
(µ
g/m
3)
806040200
OC (µg/m3)
Slope = 2.58(Intercept = 2.04)r = 0.96
Org
(µ
g m
-3)
Comparisons to LTOF-AMS
200
150
100
50
0
Ma
ss C
on
ce
ntr
ation
(µ
g m
-3)
9/15/2016
Date and Time (Local)
NR-PM1
NR-PM2.5
NR-PM1 by LTOF
Part I: Summer Beijing - PM1 vs. PM2.5200
150
100
50
0
Ma
ss C
on
ce
ntr
ation
(µ
g m
-3)
8/25/2016 9/1/2016 9/8/2016 9/15/2016 9/22/2016 9/29/2016
Date and Time (Local)
NR-PM1
NR-PM2.5
160
140
120
100
80
60
40
20
0
NR
-PM
1.0
(µ
g/m
3)
16012080400
NR-PM2.5 (µg/m3)
Slope = 0.63r = 0.94
70
60
50
40
30
20
10
0
Org
of
NR
-PM
1.0
(µ
g/m
3)
706050403020100
Org of NR-PM2.5 (µg/m3)
Slope = 0.62r = 0.91
60
50
40
30
20
10
0
Su
lfa
te o
f N
R-P
M1
.0 (
µg
/m3)
6050403020100
Sulfate of NR-PM2.5 (µg/m3)
Slope = 0.68r = 0.91
60
50
40
30
20
10
0
Nitra
te o
f N
R-P
M1
.0 (
µg
/m3)
6050403020100
Nitrate of NR-PM2.5 (µg/m3)
Slope = 0.62r = 0.91
Sep Beijing - PM1 vs. PM2.5
Total Org
Sulfate Nitrate
Sep Beijing: Haze vs Non-Haze Conditions
Org
NH4
SO4
NO3
Cl 0%
8%
3%
4%
84%
Org
NH4
SO4
NO3
Cl 0%
9%
3%
3%
84%
SO4
NO3
Cl
Org
NH4
1%
27% 19%
12%
42%
SO4 NO3
Cl
Org
NH4
1%
26% 18%
12%
42%
Non-Haze Day Haze Day
NR- PM2.5
NR-PM1
Sep Beijing - Sources of Organic Aerosol in PM2.5
0.30
0.20
0.10
0.00
Fra
ctio
n o
f sig
na
l
1009080706050403020
m/z
0.12
0.08
0.04
0.00
0.12
0.08
0.04
0.00
0.08
0.06
0.04
0.02
0.00
HOA
OOA-3
OOA-2
Haze: OOA-1
Sep Beijing - Sources of Organic Aerosol in PM1
0.30
0.20
0.10
0.00
Fra
ction o
f sig
nal
1009080706050403020
m/z
0.15
0.10
0.05
0.00
0.08
0.06
0.04
0.02
0.00
HOA
OOA-1
OOA-2
Thank you!
