Case Study for Forest Fire Episode

16 Wrap sites 20% worst case days with OC dominant

OC above the 95% Percentile Except REDW1

Location Bext Percentile OC PercentileBRCA1 Bryce Canyon National Park UT 0.851851852 0.950617284BRID1 Bridger Wilderness WY 0.831325301 0.987951807DENA1 Denali National Park AK 0.943661972 0.985915493GLAC1 Glacier National Park MT 0.91 0.96GRBA1 Great Basin National Park NV 0.936842105 0.978947368GRSA1 Great Sand Dunes National Monument CO 0.900990099 0.99009901JARB1 Jarbidge Wilderness NV 0.978494624 0.978494624LOPE1 Lone Peak Wilderness UT 0.901098901 0.989010989MORA1 Mount Rainier National Park WA 0.967391304 1MOZI1 Mount Zirkel Wilderness CO 0.967032967 0.978021978REDW1 Redwood National Park CA 0.849462366 0.741935484ROMO1 Rocky Mountain National Park CO 0.938271605 1SNPA1 Snoqualamie Pass, Snoqualamie N.F WA 0.976190476 1THSI1 Three Sisters Wilderness OR 0.989010989 0.989010989WEMI1 Weminuche Wilderness CO 0.85106383 0.978723404YELL2 Yellowstone National Park 2 WY 0.880434783 0.967391304

OC and EC concentrations on July 10 were more than ~50% higher than the average of July 1999. The ratios are similar for the sites in the same region.

0

0.5

1

1.5

2

2.5

3

3.5

DENA1

REDW1

THSI1

MORA1

SNPA1

GRBA1

JARB1

BRCA1

LOPE1

GRSA1

MOZI1

ROMO1

WEM

I1

BRID1

YELL2

GLAC1

Rat

io o

f C

on

cen

trat

ion

on

Ju

ly 1

0 to

199

9 Ju

ly A

vera

ge

OC

LAC

From WA and OR

From CA From CA and UT

From UT

From Canada

OC/EC is relatively higher during the forest fire episode

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0 1 2 3 4 5 6 7

OC

no

nso

il K

(K

-0.6

*Fe)

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0 0.2 0.4 0.6 0.8 1 1.2

EC

no

nso

il K

(K

-0.6

*Fe)Relationship between nonsoil

K and OC/EC on July 10, 1999

OC/EC concentrations are weakly related to the nonsoil K concentrations in BRID (Bridger Wilderness, WY) during the year 1999

0

0.02

0.04

0.06

0.08

0.1

0.12

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35

EC

No

nso

il K

(K

-0.6

*Fe)

Another Episode – Larger Area is Influenced

y = 0.0233x - 0.0233

R2 = 0.5688

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0 2 4 6 8

OC

no

nso

il K

y = 0.1536x - 0.0204

R2 = 0.5772

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0 0.2 0.4 0.6 0.8 1 1.2

EC

no

nso

il KRelationship between nonsoil

K and OC/EC on August 2, 2000

y = 0.0241x - 0.008

R2 = 0.8277

-0.02

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0 1 2 3 4 5 6

OC

no

nso

il K

y = 0.1701x - 0.0068

R2 = 0.8656

-0.02

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

EC

no

nso

il K

Relatively good correlations have been found between OC/EC concentrations and nonsoil K concentrations in MOZI1 (Mount Zirkel Wilderness, CO) during the year 2000

Summary

• Forest fire can be regional phenomenon – one fire can influence multiple sites, and one site may be influenced by multiple fire events.

• OC concentrations on July 10 were more than ~50% higher than the average of July 1999. The increase ratios are similar for the sites in the same region.

• OC/EC is relatively higher during the forest fire episode – forest fire emits more OC than EC compare with other anthropogenic sources.

• OC and K concentrations are relatively higher during the forest fire episodes, and some correlation may be found between them.

• Relatively good correlations have been found between OC/EC concentrations and nonsoil K concentrations in MOZI1 (Mount Zirkel Wilderness, CO) during the year 2000

• Try to find measurements of CO – one important indicator of biomass burning, in the surrounding regions.