Post on 23-Jan-2016
description
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)