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Estimates Of Cl Atom Concentrations And Hydrocarbon Kinetic Reactivity In Surface Air At Appledore Island, Maine (Usa), During International Consortium For Atmospheric Research On Transport And Transformation/Chemistry Of Halogens At The Isles Of Shoals, Alexander A. P. Pszenny, Emily V. Fischer, Rachel S. Russo, Barkley C. Sive, Ruth K. Varner
Estimates Of Cl Atom Concentrations And Hydrocarbon Kinetic Reactivity In Surface Air At Appledore Island, Maine (Usa), During International Consortium For Atmospheric Research On Transport And Transformation/Chemistry Of Halogens At The Isles Of Shoals, Alexander A. P. Pszenny, Emily V. Fischer, Rachel S. Russo, Barkley C. Sive, Ruth K. Varner
Faculty Publications
Average hydroxyl radical (OH) to chlorine atom (Cl·) ratios ranging from 45 to 119 were determined from variability‐lifetime relationships for selected nonmethane hydrocarbons (NMHC) in surface air from six different transport sectors arriving at Appledore Island, Maine, during July 2004. Multiplying these ratios by an assumed average OH concentration of 2.5 × 106 cm−3 yielded estimates of Cl· concentrations of 2.2 to 5.6 × 104 cm−3. Summed reaction rates of methane and more than 30 abundant NMHCs with OH and Cl· suggest that Cl· reactions increased the kinetic reactivity of hydrocarbons by 16% to 30% over that due to OH …
Deviations From Ozone Photostationary State During The International Consortium For Atmospheric Research On Transport And Transformation 2004 Campaign: Use Of Measurements And Photochemical Modeling To Assess Potential Causes, Robert J. Griffin, Pieter J. Beckman, Robert W. Talbot, Barkley C. Sive, Ruth K. Varner
Deviations From Ozone Photostationary State During The International Consortium For Atmospheric Research On Transport And Transformation 2004 Campaign: Use Of Measurements And Photochemical Modeling To Assess Potential Causes, Robert J. Griffin, Pieter J. Beckman, Robert W. Talbot, Barkley C. Sive, Ruth K. Varner
Faculty Publications
Nitric oxide (NO) and nitrogen dioxide (NO2) were monitored at the University of New Hampshire Atmospheric Observing Station at Thompson Farm (TF) during the ICARTT campaign of summer 2004. Simultaneous measurement of ozone (O3), temperature, and the photolysis rate of NO2 (jNO2) allow for assessment of the O3 photostationary state (Leighton ratio, Φ). Leighton ratios that are significantly greater than unity indicate that peroxy radicals (PO2), halogen monoxides, nitrate radicals, or some unidentified species convert NO to NO2 in excess of the reaction between NO and O3. Deviations from photostationary state occurred regularly at TF (1.0 ≤ Φ ≤ 5.9), …