Sources of Haze - North Cascades and Mt. Rainier National Parks

Keith RoseEPA, Region 10

WRAP IWG MeetingAugust 30, 2006

Introduction Objective - Identify sources within

geographic areas responsible for the worst visibility days in the North Cascades and Mt. Rainier National Parks in 2003

Used VIEWS reconstructed species (SO4, NO3, OCM, and EC) Bext to determine species contribution to haze for 20% worst visibility days

Used VIEWS back trajectories to determine sources of air parcels on worst visibility days

Mt. Rainier Back Trajectory 4-21-03

Mt. Rainier Species Bext - April 21, 2003

0

10

20

30

40

50

60

70

NO3 SO4 OMC EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in Portland and along the I-5 corridor in western OR

Total Bext = 45 Mm-1 (20% worst > 41 Mm-1)

Mt. Rainier Back Trajectory 6-8-03

Mt. Rainier Species Bext - June 8, 2003

0

5

10

15

20

25

30

35

40

45

50

NO3 SO4 OMC EC

Species

Per

cen

t T

ota

l B

ext

Sources

NO3 – Centralia Power Plan SO4 – Offshore marine vessels OCM – Biogenic emissions and/or

fires in BC (OC/EC = 5.8) Total Bext = 57 Mm-1

Mt. Rainier Back Trajectory 7-11-03

Mt. Rainier Species Bext - July 11, 2003

0

10

20

30

40

50

60

70

NO3 SO4 OMC EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in Portland area, and offshore marine vessels

Total Bext = 41 Mm-1

Mt. Rainier Back Trajectory 8-7-03

Mt. Rainier Species Bext - August 7, 2003

0

5

10

15

20

25

30

35

40

45

50

NO3 SO4 OMC EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in Portland and along the I-5 corridor in western OR

OCM – Point, area, and mobile sources in Portland and along the I-5 corridor in western OR

Total Bext = 56 Mm-1

Mt. Rainier Back Trajectory 9-3-03

Mt. Rainier Species Bext - September 3, 2003

0

5

10

15

20

25

30

35

40

45

50

NO3 SO4 OMC EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in Puget Sound and Vancouver area

OCM – Wildfires in northern WA and BC (OC/EC = 3.5)

Total Bext = 72 Mm-1

North Cascades Back Trajectories 4-21-03

North Cascades Species Bext - April 21, 2003

0

10

20

30

40

50

60

NO3 SO4 OCM EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in the Columbia Gorge and Portland area

OCM – Agricultural burning in eastern WA and OR?

Total Bext = 32 Mm-1 (20% worst > 28 Mm-1)

North Cascades Back Trajectories 7-11-03

North Cascades Species Bext - July 11, 2003

0

5

10

15

20

25

30

35

40

45

50

NO3 SO4 OCM EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in Puget Sound, and offshore marine vessels

OCM – Point, area and mobile sources in Puget Sound

Total Bext = 31 Mm-1

North Cascades Back Trajectories 7-26-03

North Cascades Species Bext - July 26, 2003

0

10

20

30

40

50

60

NO3 SO4 OCM EC

Species

Per

cen

t T

ota

l B

ext

Sources

SO4 – Point, area, and mobile sources in Vancouver area, and offshore marine vessels

Total Bext – 43 Mm-1

North Cascades Back Trajectories 9-3-03

North Cascades Species Bext - September 3, 2003

0

10

20

30

40

50

60

70

80

90

NO3 SO4 OCM EC

Species

Per

cen

t T

ota

l B

ext

Sources

OCM – Wildfires in BC (OC/EC = 7.3)

Total Bext = 334 Mm-1

North Cascades Back Trajectories 10-3-03

North Cascades Species Bext - October 3, 2003

0

10

20

30

40

50

60

70

80

NO3 SO4 OCM EC

Species

Per

cen

t T

ota

l B

ext

Sources

High OCM – Wildfires in BC and Alberta (OC/EC = 6.6)

Total Bext = 137 Mm-1

Summary – Mt. Rainier

Visibility impacted primarily by: SO4 from point, area, and mobile

sources in Puget Sound and western OR (April-Oct)

SO4 from marine vessels (April-Oct) OCM from wildfires in northern WA

and BC (Aug-Oct)

Summary – North Cascades

Visibility impacted primarily by: SO4 from point, area, and mobile

sources in Puget Sound and Vancouver area (April-July)

SO4 from marine vessels (April-July) OCM from wildfires in BC (Aug-Oct)