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)