2 h BBOP: Tar Balls (TB) in Wildfires - ASR · BBOP: Tar Balls (TB) in Wildfires 2.5 h 2 h 1 h 0...
Transcript of 2 h BBOP: Tar Balls (TB) in Wildfires - ASR · BBOP: Tar Balls (TB) in Wildfires 2.5 h 2 h 1 h 0...
BBOP:TarBalls(TB)inWildfires
2.5h�
2h�
1h�
0h�
2µm�
2µm�
1µm�
2µm�TBareaMajorclassofBrownCarbon
0.4
0.3
0.2
0.1
0.0
Mas
s fra
ctio
n of
TB
, fTB
00:00 00:30 01:00 01:30 02:00 02:30
Plume Age (hr)
1300
1200
1100
1000
900
800
700
600
Bscat /C
O (M
m-1 ppb
-1)
Average of limiting CE cases CETB = CEORG CETB = 0
1.0
0.9
0.8
0.7
0.6
0.5
SS
A 55
0nm
00:00 01:00 02:00Plume age (hr)
Calculated SSAcalcStrong Tar Ball Abs.m = 1.67 - 0.27i
SSAcalcWeak Tar Ball Abs.m = 1.56 - 0.02i
Background
Over fire Downwind
SSAfield
Sedlacek, Buseck, Adachi, et al.,
0.25
0.20
0.15
0.10
0.05
0.00
Aver
age
TB n
umbe
r fra
ctio
n
1.00.80.60.40.20.0
Photochemical Age = -log10 (NOx/NOy)
TBsareaWeakAbsorberTBsareaMajorSourceofBBPMEmissions
TBsareaSecondaryAerosol
BBOP:ChemicalandOpDcalProperDesofBBAerosols
POA
POA + SOA
500
400
300
200
100
B abs
/CO
(Mm
-1/p
pm)
00:00 00:30 01:00 01:30
Plume Age
Downwind Near Source
Org BC SO4
NO3 NH4 Chl
0.35
0.30
0.25
0.20
O:C
Rat
io
35302520151050
Downwind distance (km)
0.018
0.016
0.014
0.012
0.010
f60
Rat
io
400
300
200
100
0
ORG
/ CO
(ug/
m3
/ ppm
v)
35302520151050
Distance downwind (km)
Kleinman,OnaschSedlacek,Arno4,Onasch
BrCAbsorpDonIncreasewithAge
ParDculateNitrateIncreasewithAge
OAOxidaDonIncreasewithAge:SOA
Org/COConstantdespiteChemistry
1.0
0.8
0.6
0.4
0.2
0.0Mas
s Fr
actio
n R
emai
ning
(%)
2001601208040TD Temperature (ºC)
BBOA-1BBOA-2BBOA-3BL-OOALV-OOASulfateNitrate
h)
BBOP:RegionalInfluenceofWildfireEmissions
120
80
40
0
ΔOrg
/ΔΣC
1.0
0.5
0.0
ΔC3H
5O2+ /Δ
Σ C
1.000.950.900.850.80MCE
2.0
1.5
1.0
0.5
0.0ΔC2H
4O2+ /Δ
Σ C
a
b
c
r2 > 0.8
0.5 < r2 <= 0.8
r2 < 0.5
1.00.80.60.40.20.0
ΔSO 4
/ΔΣC
1.000.950.900.850.80MCE
6
4
2
0
ΔNO 3
/ΔΣC
300
200
100
0
ΔSct 5
50nm
/ΔΣC
d
e
f
MBO G-1
Collieretal.,ES&T2016
StrongDependenceonMCE
Zhouetal.,ACP2017
BBOA-3=TB?60
40
20
0
Mas
s C
onc.
(µg
m-3
)
Night Day
53%
15%
24%
37% 20%
37%
BBOA-1 BBOA-2 BBOA-3 BL-OOA LV-OOA
b)BBOA-1 BBOA-2 BBOA-3 BL-OOA LV-OOAFresh Aged Aged
Regional/FreeTrop.
BoundaryLayer
O/C=0.35 O/C=0.65 O/C=1.06 O/C=0.69 O/C=1.09
3DifferentTypesofBBOA HighlyOxidizedandLowVolaDlityBBOAIncreasewithAge
5 10
15 w s 20
25
W
S
N
E
2 4 6 8 10 12
BBOA-3 (mg m-3)
5 10
15 w s 20
25
W
S
N
E
1 2 3 4 5 6
BBOA-2 (mg m-3)
5 10
15 w s 20
25
W
S
N
E
5 10 15 20
BBOA-1 (mg m-3)