Reactive nitrogen partitioning and its relationship to winter ozone events in Utah
Autor: | William P. Dubé, Jessica B. Gilman, Jochen Stutz, Abigail R. Koss, Eric J. Williams, Joel A. Thornton, Patricia K. Quinn, Steven S. Brown, Bin Yuan, James P. Kercher, Robert Wild, Brian M. Lerner, John S. Holloway, Ronald C. Cohen, Kyle J. Zarzana, Robert McLaren, Carsten Warneke, Peter Edwards, Timothy S. Bates, J. A. de Gouw, Cora J. Young, Patrick R. Veres, J. M. Roberts, L. Lee |
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Rok vydání: | 2016 |
Předmět: |
Atmospheric Science
Daytime Ozone 010504 meteorology & atmospheric sciences Reactive nitrogen 010501 environmental sciences Atmospheric sciences 01 natural sciences lcsh:QC1-999 Aerosol lcsh:Chemistry chemistry.chemical_compound lcsh:QD1-999 chemistry Nitric acid Environmental science Tropospheric ozone lcsh:Physics NOx 0105 earth and related environmental sciences |
Zdroj: | Atmospheric Chemistry and Physics, Vol 16, Pp 573-583 (2016) |
ISSN: | 1680-7324 |
Popis: | High wintertime ozone levels have been observed in the Uintah Basin, Utah, a sparsely populated rural region with intensive oil and gas operations. The reactive nitrogen budget plays an important role in tropospheric ozone formation. Measurements were taken during three field campaigns in the winters of 2012, 2013 and 2014, which experienced varying climatic conditions. Average concentrations of ozone and total reactive nitrogen were observed to be 2.5 times higher in 2013 than 2012, with 2014 an intermediate year in most respects. However, photochemically active NOx (NO + NO2) remained remarkably similar all three years. Nitric acid comprised roughly half of NOz ( ≡ NOy − NOx) in 2013, with nighttime nitric acid formation through heterogeneous uptake of N2O5 contributing approximately 6 times more than daytime formation. In 2012, N2O5 and ClNO2 were larger components of NOz relative to HNO3. The nighttime N2O5 lifetime between the high-ozone year 2013 and the low-ozone year 2012 is lower by a factor of 2.6, and much of this is due to higher aerosol surface area in the high-ozone year of 2013. A box-model simulation supports the importance of nighttime chemistry on the reactive nitrogen budget, showing a large sensitivity of NOx and ozone concentrations to nighttime processes. |
Databáze: | OpenAIRE |
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