Title

Decrease in acid rain over 24-year study at Paradise, Mt.Rainier National Park

Presenter Information

Naomi Beebe

Document Type

Oral Presentation

Location

SURC Ballroom C/D

Start Date

15-5-2014

End Date

15-5-2014

Keywords

Acid, Rain, Environment

Abstract

Weekly wet precipitation samples from Paradise in Mt. Rainier National Park, Washington, were analyzed for major anions and cations, conductivity and pH. Volume weighted 3-month averages were tested for significant trends throughout the 23-year monitoring period starting in 1988 and compared with analogous data collected at established National Atmospheric Deposition Program sites throughout the state. Proton concentrations decreased by a significant amount of 59 percent resulting in a pH increase of wet precipitation from 5.1 to 5.5 (P=0.001). Similar trends were observed for the acidic sulfate and nitrate species. These results indicate that air pollution standards contribute significantly to the decrease in acid rain deposition to this pristine and vulnerable high elevation location, and that trans-Pacific transport of pollution is not detected in the form of acid rain and associated anions.

Poster Number

13

Faculty Mentor(s)

Johansen, Anne

Additional Mentoring Department

Chemistry

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Decrease in acid rain over 24-year study at Paradise, Mt.Rainier National Park

SURC Ballroom C/D

Weekly wet precipitation samples from Paradise in Mt. Rainier National Park, Washington, were analyzed for major anions and cations, conductivity and pH. Volume weighted 3-month averages were tested for significant trends throughout the 23-year monitoring period starting in 1988 and compared with analogous data collected at established National Atmospheric Deposition Program sites throughout the state. Proton concentrations decreased by a significant amount of 59 percent resulting in a pH increase of wet precipitation from 5.1 to 5.5 (P=0.001). Similar trends were observed for the acidic sulfate and nitrate species. These results indicate that air pollution standards contribute significantly to the decrease in acid rain deposition to this pristine and vulnerable high elevation location, and that trans-Pacific transport of pollution is not detected in the form of acid rain and associated anions.