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Chemistry of NPF in mixed biogenic and urban emissions - Observations from CARES Q. Zhang, A. Setyan, et al UC Davis
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Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

Jul 06, 2020

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Page 1: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

Chemistry of NPF in mixed biogenic and urban emissions - Observations from CARES

Q. Zhang, A. Setyan, et al

UC Davis

Page 2: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

T0

T1

Frequent NPF & growth events • Occurred on regional scale,

T0 data from C. Song

Page 3: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

• new particles were transported from T0 to T1

• PM grow during transport

Frequent NPF & growth events

Page 4: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

4

Τ1 ∆Dm/∆t ~ 5 nm / hr T0 ∆Dm/∆t ~ 7 nm / hr

Interrogate the chemistry of NP growth Growth driven by condensation of organics and sulfate

NPF days Non-NPF days

Page 5: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

Growth of New Particles: SOA >> Sulfate

Page 6: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

Urban transport, “A”-SOA

Biogenic influenced, “B”-SOA

Growth of New Particles: SOA >> Sulfate

Page 7: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

a)

b)

Growth of new particles was mainly driven by “A”-influenced SOA

c)

d)

Urban transport, “A”-SOA

Biogenic influenced, “B”-SOA

Page 8: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created
Page 9: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

T0

T1

Refineries (SO2)

Night time Day time

Page 10: Q. Zhang, A. Setyan, et al UC Davis · Q. Zhang, A. Setyan, et al UC Davis. T0 . T1 . Frequent NPF & growth events • Occurred on regional scale, T0 data from ... Qi Zhang Created

Setyan et al., ACP, 2012