DOI: 10.1002/jgrd.50472
论文题名: Trends in ozone, its precursors, and related secondary oxidation products in Los Angeles, California: A synthesis of measurements from 1960 to 2010
作者: Pollack I.B. ; Ryerson T.B. ; Trainer M. ; Neuman J.A. ; Roberts J.M. ; Parrish D.D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 11 起始页码: 5893
结束页码: 5911
语种: 英语
英文关键词: long-term trends
; Los Angeles
; nitrogen oxides
; ozone
; secondary oxidation products
; volatile organic compounds
Scopus关键词: Nitric acid
; Nitrogen oxides
; Oxidation
; Volatile organic compounds
; Atmospheric oxidation
; Enhancement ratios
; Long-term trend
; Los angeles
; Oxidation products
; Peroxyacetyl nitrates
; Secondary oxidation products
; South Coast Air basins
; Ozone
; atmospheric chemistry
; atmospheric pollution
; data set
; emission
; nitrate
; nitrite
; nitrogen oxides
; oxidation
; ozone
; radical
; temporal analysis
; trend analysis
; volatile organic compound
; California
; Los Angeles [California]
; United States
英文摘要: Decreases in ozone (O3 ) observed in California's South Coast Air Basin (SoCAB) over the past five decades have resulted from decreases in local emissions of its precursors, nitrogen oxides (NOx = NO + NO 2 ) and volatile organic compounds (VOCs). Ozone precursors have been characterized in the SoCAB with measurements dating back to 1960. Here we compile an extensive historical data set using measurements in the SoCAB between 1960 and 2010. Faster rates of decrease have occurred in abundances of VOCs (-7.3 ± 0.7% yr-1) than in NOx (-2.6 ± 0.3% yr-1), which have resulted in a decrease in VOC/NOx ratio (-4.8 ± 0.9% yr-1) over time. Trends in the NOx oxidation products peroxyacetyl nitrate (PAN) and nitric acid (HNO3 ), measured in the SoCAB since 1973, show changes in ozone production chemistry resulting from changes in precursor emissions. Decreases in abundances of PAN (-9.3 ± 1.1% yr-1) and HNO3 (-3.0 ± 0.8% yr-1) reflect trends in VOC and NOx precursors. Enhancement ratios of O3 to (PAN + HNO3 ) show no detectable trend in ozone production efficiency, while a positive trend in the oxidized fraction of total reactive nitrogen (+2.2 ± 0.5% yr -1) suggests that atmospheric oxidation rates of NOx have increased over time as a result of the emissions changes. Changes in NO x oxidation pathways have increasingly favored production of HNO 3 , a radical termination product associated with quenching the ozone formation cycle. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63681
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305, United States
Recommended Citation:
Pollack I.B.,Ryerson T.B.,Trainer M.,et al. Trends in ozone, its precursors, and related secondary oxidation products in Los Angeles, California: A synthesis of measurements from 1960 to 2010[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(11)