CHEM-5151_S05_L20_AcidDep

CHEM-5151_S05_L20_AcidDep - Lecture 20 Acid Deposition...

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1 Required Reading: FP Chapter 4 (only sections that I cover) Suggested Reading: Jacob Chapter 13 Atmospheric Chemistry CHEM-5151 / ATOC-5151 Spring 2005 Prof. Jose-Luis Jimenez Lecture 20: Acid Deposition Outline of Lecture A. Introduction B. Solubility of gases in rain / fog / clouds C. Oxidation of SO 2
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2 Acid Rain vs. Acid Deposition •A c id R a in – Refers to hydrometeors, sizes ~ several mm – Also cloud or fog droplets ~ several µ m • Very dilute solutions of acids in H 2 O – Also known as “wet deposition” • Acid Deposition – Includes wet deposition – Also “dry deposition” • Direct deposition of aerosols – Dry particles, or very concentrated solutions • Also deposition of the gas-phase acids, e.g. HNO 3 – Naming is independent of whether surface is dry or wet Acid Deposition • pH of rain decreases, mostly due to H
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3 Conversion of SO 2 to Sulfate Atmospheric Science: Something in the Air, Daniel M. Murphy, Science 307(5717):1888-1890, March 2005. Evolution of SO 2 to Sulfate Ratio 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 SO 2 / Sulfate Ratio (ppb / µ g m -3 ) 18 17 16 15 25 20 15 10 5 0 Sulfate aerosol (μg m 10 5 0 (ppbv) Data courtesy of D. Murphy, NOAA AL
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4 Major Acids • Sulfuric acid, H 2 SO 4 • Nitric acid, HNO 3 • Nitrous acid, HONO = HNO 2 – Less well known, hard to measure
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CHEM-5151_S05_L20_AcidDep - Lecture 20 Acid Deposition...

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