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Titolo:
LONG-TERM TRENDS IN-GROUND LEVEL OZONE OVER THE CONTIGUOUS UNITED-STATES, 1980-1995
Autore:
FIORE AM; JACOB DJ; LOGAN JA; YIN JH;
Indirizzi:
HARVARD UNIV,DEPT EARTH & PLANETARY SCI,20 OXFORD ST CAMBRIDGE MA 02138 HARVARD UNIV,DEPT EARTH & PLANETARY SCI CAMBRIDGE MA 02138 HARVARD UNIV,DIV ENGN & APPL SCI CAMBRIDGE MA 02138
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D1, volume: 103, anno: 1998,
pagine: 1471 - 1480
Fonte:
ISI
Lingua:
ENG
Soggetto:
AIR-QUALITY; TROPOSPHERIC OZONE; NITROGEN-OXIDES; RURAL OZONE; URBAN; HYDROCARBONS; MODEL; SENSITIVITY; CALIFORNIA; EMISSIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
A.M. Fiore et al., "LONG-TERM TRENDS IN-GROUND LEVEL OZONE OVER THE CONTIGUOUS UNITED-STATES, 1980-1995", J GEO RES-A, 103(D1), 1998, pp. 1471-1480

Abstract

Long-term trends of median and 90th percentile summer afternoon O-3 concentrations were examined at 549 sites across the United States for the 1980-1995 period, Daily temperature data were used to account for the variability in O-3 concentrations associated with temperature. Both before and after segregating the O-3 data by temperature, trends were insignificant over most of the continental United States. No region of the United States experienced a significant increase in O-3 Concentrations during the 1980-1995 period. Decreasing trends were predominantly clustered in the three largest metropolitan areas: New York City, Los Angeles, and Chicago. In these areas, additional sites with trendswere identified in the temperature-segregated analysis. Correlation of trends with local anthropogenic emissions of nitrogen oxides (NOx = NO + NO2) and volatile organic compounds (VOC) indicates a greater frequency of decreasing trends for urban sites with high emission. National emission inventories for the United States indicate that anthropogenic VOC emissions decreased by 12% over the 1980-1995 period while NOxemissions remained constant. The observed O-3 trends are consistent with the view that summertime O-3 production over the United States is NOx-limited except in the largest metropolitan areas where it is partly VOC-limited.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:43:16