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

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Presentation transcript:

Sources of Haze - North Cascades and Mt. Rainier National Parks Keith Rose EPA, Region 10 WRAP IWG Meeting August 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

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

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

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

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

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

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

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

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

Sources OCM – Wildfires in BC (OC/EC = 7.3) Total Bext = 334 Mm-1

North Cascades Back Trajectories 10-3-03

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)