Search Results - (Author, Cooperation:D. W. Fahey)
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1Latest Papers from Table of Contents or Articles in PressO. R. Cooper ; A. O. Langford ; D. D. Parrish ; D. W. Fahey
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-06-06Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Air Pollutants/*standards ; Environmental Monitoring ; Humans ; Ozone/*standards ; *Preventive Medicine ; United States ; United States Environmental Protection AgencyPublished by: -
2Latest Papers from Table of Contents or Articles in PressG. J. Velders ; A. R. Ravishankara ; M. K. Miller ; M. J. Molina ; J. Alcamo ; J. S. Daniel ; D. W. Fahey ; S. A. Montzka ; S. Reimann
American Association for the Advancement of Science (AAAS)
Published 2012Staff ViewPublication Date: 2012-03-01Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Latest Papers from Table of Contents or Articles in PressJ. A. de Gouw ; A. M. Middlebrook ; C. Warneke ; R. Ahmadov ; E. L. Atlas ; R. Bahreini ; D. R. Blake ; C. A. Brock ; J. Brioude ; D. W. Fahey ; F. C. Fehsenfeld ; J. S. Holloway ; M. Le Henaff ; R. A. Lueb ; S. A. McKeen ; J. F. Meagher ; D. M. Murphy ; C. Paris ; D. D. Parrish ; A. E. Perring ; I. B. Pollack ; A. R. Ravishankara ; A. L. Robinson ; T. B. Ryerson ; J. P. Schwarz ; J. R. Spackman ; A. Srinivasan ; L. A. Watts
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-03-12Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
4Articles: DFG German National LicensesProffitt, M. H. ; Fahey, D. W. ; Kelly, K. K. ; Tuck, A. F.
[s.l.] : Nature Publishing Group
Published 1989Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Data taken during the 1987 Antarctic Airborne Ozone Experiment based in Punta Arenas, Chile, are used to show that from mid-August until the end of the mission in late September there was a high-latitude ozone loss outside the Antarctic ozone hole. Therefore, not only is the geographic extent ...Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesSingh, H. B. ; Salas, L. J. ; Ridley, B. A. ; Shetter, J. D. ; Donahue, N. M. ; Fehsenfeld, F. C. ; Fahey, D. W. ; Parrish, D. D. ; Williams, E. J. ; Liu, S. C. ; Hübler, G. ; Murphy, P. C.
[s.l.] : Nature Publishing Group
Published 1985Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The measurements were made at the C-l research site of the Mountain Research Station of the University of Colorado (402' N lat, 10532' W long., 3.05-km elevation above sea level). Prevailing winds at this site are from the west and are relatively free of anthropogenic pollution. However, there are ...Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesFahey, D. W. ; Solomon, S. ; Kawa, S. R. ; Loewenstein, M. ; Podolske, J. R. ; Strahan, S. E. ; Chan, K. R.
[s.l.] : Nature Publishing Group
Published 1990Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesFahey, D. W. ; Kawa, S. R. ; Woodbridge, E. L. ; Tin, P. ; Wilson, J. C. ; Jonsson, H. H. ; Dye, J. E. ; Baumgardner, D. ; Borrmann, S. ; Toohey, D. W. ; Avallone, L. M. ; Proffitt, M. H. ; Margitan, J. ; Loewenstein, M. ; Podolske, J. R. ; Salawitch, R. J. ; Wofsy, S. C. ; Ko, M. K. W. ; Anderson, D. E. ; Schoeber, M. R. ; Chan, K. R.
[s.l.] : Nature Publishing Group
Published 1993Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] In situ measurements of stratospheric sulphate aerosol, reactive nitrogen and chlorine concentrations at middle latitudes confirm the importance of aerosol surface reactions that convert active nitrogen to a less active, reservoir form. This makes mid-latitude stratospheric ozone less vulnerable to ...Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesFahey, D. W. ; Kelly, K. K. ; Kawa, S. R. ; Tuck, A. F. ; Loewenstein, M. ; Chan, K. R. ; Heidt, L. E.
[s.l.] : Nature Publishing Group
Published 1990Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1573-0662Keywords: Reactive odd-nitrogen ; atmospheric measurements ; gold catalysis ; chemiluminescenceSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesNotes: Abstract A catalytic reduction technique for the measurement of total reactive odd-nitrogen NO y in the atmosphere was evaluated in laboratory and field tests. NO y component species include NO, NO2, NO3, HNO3, N2O5, CH3COO2NO2(PAN), and particulate nitrate. The technique utilizes the reduction of the higher oxides to NO in reaction with CO on a metal catalyst and the subsequent detection of NO by chemiluminescence produced in reaction with O3. The efficiency and linearity of the conversion of the principal NO y species were examined for mixing ratios in the range of 0.1 to 100 parts per billion by volume (ppbv). Results of tests with Au, Ni, and stainless steel as the catalyst in the temperature range of 25–500°C showed Au to be the preferred catalyst. NH3, HCN, N2O, CH4, and various chlorine and sulfur compounds were checked as possible sources of NO y interference with the Au catalyst. The effects of pressure, O3, and H2O on NO y conversion were also examined. The results of the checks and tests in the laboratory showed the technique to be suitable for initial NO y measurements in the atmosphere. The technique was subsequently tested in ambient air at a remote ground-based field site located near Niwot Ridge, Colorado. The results of conversion and inlet tests made in the field and a summary of the NO y data are included in the discussion.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesParrish, D. D. ; Fahey, D. W. ; Williams, E. J. ; Liu, S. C. ; Trainer, M. ; Murphy, P. C. ; Albritton, D. L. ; Fehsenfeld, F. C.
Springer
Published 1986Staff ViewISSN: 1573-0662Keywords: Tropospheric ozone ; photochemistry ; nitrogen oxidesSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyGeosciencesNotes: Abstract The mixing ratios for ozone and NOx (NO+NO2) have been measured at a rural site in the United States. From the seasonal and diurnal trends in the ozone mixing ratio over a wide range of NOx levels, we have drawn certain conclusions concerning the ozone level expected at this site in the absence of local photochemical production of ozone associated with NOx from anthropogenic sources. In the summer (June 1 to September 1), the daily photochemical production of ozone is found to increase in a linear fashion with increasing NOx mixing ratio. For NOx mixing ratios less than 1 part per billion by volume (ppbv), the daily increase is found to be (17±3) [NOx]. In contrast, the winter data (December 1 to March 1) indicate no significant increase in the afternoon ozone level, suggesting that the photochemical production of ozone during the day in winter approximately balances the chemical titration of ozone by NO and other pollutants in the air. The extrapolated intercept corresponding to [NOx]=0 taken from the summer afternoon data is 13% less than that observed from the summer morning data, suggesting a daytime removal mechanism for O3 in summer that is attributed to the effects of both chemistry and surface deposition. No significant difference is observed in the intercepts inferred from the morning and afternoon data taken during the winter. The results contained herein are used to deduce the background ozone level at the measurement site as a function of season. This background is equated with the natural ozone background during winter. However, the summer data suggest that the background ozone level at our site is elevated relative to expected natural ozone levels during the summer even at low NOx levels. Finally, the monthly daytime ozone mixing ratios are reported for 0≤[NOx]≤0.2 ppbv, 0.3 ppbv≤[NOx]≤0.7 ppbv and 1 ppbv≤[NOx]. These monthly ozone averages reflect the seasonal ozone dependence on the NOx level.Type of Medium: Electronic ResourceURL: