Observations of reactive oxidized nitrogen and speciation of NOyduring the PROPHET summer 1998 intensive
| Autor: | Owen R. Cooper, Steven B. Bertman, Sanford Sillman, Paul B. Shepson, William R. Stockwell, Gerald J. Keeler, Mary Anne Carroll, Troy Thornberry, Jennie L. Moody, Margaret Pippin, John W. Grossenbacher, Kristi Ostling |
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| Rok vydání: | 2001 |
| Předmět: |
Atmospheric Science
Meteorology Reactive nitrogen media_common.quotation_subject Soil Science Aquatic Science Oceanography chemistry.chemical_compound Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Mixing ratio Alkyl Isoprene Earth-Surface Processes Water Science and Technology media_common chemistry.chemical_classification Ecology Chemistry Paleontology Forestry Aerosol Speciation Geophysics Deposition (aerosol physics) Space and Planetary Science Environmental chemistry Nitrogen oxide |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 106:24359-24386 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/2000jd900760 |
| Popis: | Measurements of NO y , NO x , PAN, PPN, MPAN, C 3 -C 5 alkyl nitrates, total isoprene nitrates, HNO 3 , HONO, and aerosol NO 3 - and NO 2 - were made during the summer 1998 intensive of the Program for Research on Oxidants: Photochemistry, Emissions, and Transport (PROPHET). Mixing ratios of NO y , NO x , PAN, PPN, and alkyl nitrates were observed to have a strong dependence on the direction of transport to the site as was expected from the distribution of major urban and industrial sources. A peak in NO x and NO x /NO y during the morning in southerly flow provides evidence for the transport of relatively unprocessed emissions in layers above the nocturnal boundary layer. The difference in PAN and PPN levels between north and south flow directions indicates a net transport of reactive nitrogen to regions farther north. Isoprene nitrates were observed to typically comprise less than 1% of NO y in spite of the dominance of isoprene in local VOC chemistry, although due to the rapid losses of isoprene nitrates through reaction, vertical mixing, and deposition, their role in the processing of NO y may be significant. General agreement was observed between NO y and the sum of the individually measured constituents during ten 24 hour periods, although a linear regression indicates the potential for an interference in the individual measurements and a possible shortfall in NO y . Measurements indicate that HONO may play a larger role in the reactive nitrogen budget than previously expected for a rural site. HONO/NO 2 for a 24 hour period was observed to be 0.09-0.25 and suggests the likelihood of a significant heterogeneous production pathway or pathways. |
| Databáze: | OpenAIRE |
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