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  • American Geophysical Union (AGU)  (9)
  • Parrish, D. D.  (9)
  • 1
    Online Resource
    Online Resource
    The total reactive oxidized nitrogen levels and the partitioning between the individual species at six rural sites in eastern North America
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Atmospheres Vol. 98, No. D2 ( 1993-02-20), p. 2927-2939
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 98, No. D2 ( 1993-02-20), p. 2927-2939
    Abstract: During the late summer and early fall of 1988, measurements of many trace species of tropospheric photochemical interest, including NO, NO 2 , PAN, HNO 3 , NO 3 − ; NO Y , and ozone were made at seven surface stations in the eastern United States and Canada. The NO Y (as well as ozone) levels and its partitioning were strongly influenced by the diurnal evolution of the boundary layer at the sites that are beneath the nocturnal inversion. At the higher elevation sites the median levels of all species were much more nearly constant. During the daytime the median NO Y levels were 2 to 5 ppbv at all sites, which may be representative of rural areas in the populated regions of eastern North America. Each site showed variations in the NO Y levels of an order of magnitude or more. Measurements from all of the sites are consistent with the major contributors to NO Y being NO X (the sum of NO and NO 2 ), PAN, and nitric acid with a minor contribution from aerosol nitrate. At the lower elevation sites the median [NO X ] to [NO Y ] ratios were 70% or more during the night and declined to minima of 25 to 40% during the day. During the daytime the ranges of the median contributions of PAN and HNO 3 to NO Y were 12 to 25% and approximately 20 to 30%, respectively. The distributions of the contributions about these medians are discussed. Results from all of the sites are consistent with the individually measured species accounting for about 90% of the simultaneously measured NO Y .
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/92JD02384
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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  • 2
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    Correlation of ozone with NO y in photochemically aged air
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Atmospheres Vol. 98, No. D2 ( 1993-02-20), p. 2917-2925
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 98, No. D2 ( 1993-02-20), p. 2917-2925
    Abstract: During the summer of 1988, measurements of photochemical trace species were made at a coordinated network of seven rural sites in the eastern United States and Canada. At six of these sites concurrent measurements of ozone and the sum of the reactive nitrogen species, NO y , were made, and at four of the sites a measure for the reaction products of the NO x oxidation was obtained. Common to all sites, ozone, in photochemically aged air during the summer, shows an increase with increasing NO y levels, from a background value of 30–40 parts per billion by volume (ppbv) at NO y mixing ratios below 1 ppbv to values between 70 to 100 ppbv at NO y levels of 10 ppbv. Ozone correlates even more closely with the products of the NO x oxidation. The correlations from the different sites agree closely at mixing ratios of the oxidation products below 5 ppbv, but systematic differences appear at higher levels. Variations in the biogenic hydrocarbon emissions may explain these differences.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/92JD01910
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1993
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  • 3
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    Relationships between PAN and ozone at sites in eastern North America
    American Geophysical Union (AGU) ; 1995
    In:  Journal of Geophysical Research: Atmospheres Vol. 100, No. D11 ( 1995-11-20), p. 22821-22830
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 100, No. D11 ( 1995-11-20), p. 22821-22830
    Abstract: Measurements of ozone and PAN (peroxyacetic nitric anhydride) were made at four sites in eastern North America; Bondville, Illinois, Egbert, Ontario, Scotia, Pennsylvania, and Whitetop Mountain, Virginia., in July and August of 1988 as part of a study of regional oxidant photochemistry. The concentrations of PAN ranged from 〈 0.010 to 9.2 parts‐per‐billion by volume (ppbv) and those of O 3 ranged from 〈 2 to 139 ppbv. Diurnal concentration profiles showed PAN and O 3 to be removed within nocturnal boundary layers, especially if nitric oxide was present, and that O 3 was, for most sites, more rapidly removed than PAN. The only mountain top site at which PAN was measured showed distinctly different diurnal profiles in which O 3 was actually higher at night, suggesting that convective flow driven by surface cooling served to transport air down from higher in the mixed layer at night. The afternoon production of PAN and O 3 was also apparent and led to an overall linear correlation of O 3 and PAN between the hours of 1300 and 1800. The comparison of this result with other measurements, estimates of PAN formation rates, and model calculations indicates that the production of PAN relative to ozone is far greater (x3) than can be accounted for by acetaldehyde reactions with OH, there is a wide disparity in model descriptions of PAN production, and confirms the non‐linear dependence of O 3 production on NO x .
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/95JD01221
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
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  • 4
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    Atmospheric emissions from the Deepwater Horizon spill constrain air-water partitioning, hydrocarbon fate, and leak rate : DEEPWATER HORIZON ATMOSPHERIC EMISSIONS
    American Geophysical Union (AGU) ; 2011
    In:  Geophysical Research Letters Vol. 38, No. 7 ( 2011-04), p. n/a-n/a
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 38, No. 7 ( 2011-04), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2011GL046726
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2011
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  • 5
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    Observations of ozone transport from the free troposphere to the Los Angeles basin : OZONE TRANSPORT TO THE LOS ANGELES BASIN
    American Geophysical Union (AGU) ; 2012
    In:  Journal of Geophysical Research: Atmospheres Vol. 117, No. D21 ( 2012-11-16), p. n/a-n/a
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 117, No. D21 ( 2012-11-16), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2011JD016919
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2012
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  • 6
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    Gas-phase chemical characteristics of Asian emission plumes observed during ITCT 2K2 over the eastern North Pacific Ocean : CHEMICAL CHARACTERISTICS OF ASIAN PLUMES
    American Geophysical Union (AGU) ; 2004
    In:  Journal of Geophysical Research: Atmospheres Vol. 109, No. D23 ( 2004-12-16)
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 109, No. D23 ( 2004-12-16)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2003JD004488
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2004
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  • 7
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    An intercomparison of five ammonia measurement techniques
    American Geophysical Union (AGU) ; 1992
    In:  Journal of Geophysical Research: Atmospheres Vol. 97, No. D11 ( 1992-07-20), p. 11591-11611
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 97, No. D11 ( 1992-07-20), p. 11591-11611
    Abstract: An intercomparison has been conducted among five instruments which measure gas phase ammonia at low concentration in the atmosphere: (1) a photofragmentation/laser‐induced fluorescence (PF/LIF) instrument; (2) a molybdenum oxide annular denuder sampling/chemiluminescence detection (MOADS) technique; (3) a tungsten oxide denuder sampling/chemiluminescence detection (DARE) system; (4) a citric acid coated denuder sampling/ion chromatographic analysis (CAD/IC) method; and (5) an oxalic acid coated filter pack sampling/colorimetric analysis (FP/COL) method. Mixtures of ammonia in air at flow rates of 1800 (STP) L/min and concentrations from 0.1 to 14 parts per billion by volume (ppbv) with the addition of possible interferants (CH 3 NH 2 , CH 3 CN, NO, NO 2 , O 3 , and H 2 O) were provided for simultaneous tests. In addition, the five instruments made simultaneous ambient air measurements both from a common manifold and from their separate inlets located at a common height above the ground. Several conclusions were reached: (1) No artifacts or interferences were conclusively established for any of the techniques, although CH 3 NH 2 may interfere in the MOADS system. (2) Measurements from the PF/LIF and the CAD/IC methods agreed well with the prepared mixtures over the full range of ammonia concentrations. The high specificity and time resolution (l min) of the PF/LIF results allowed data from this technique to be used as a basis set for comparisons. (3) For fog‐free conditions, ambient measurements from all of the instruments generally agreed to within a factor of 2 for ammonia levels above 0.5 ppbv. The CAD/IC and PF/LIF instruments agreed to within 15% on average for all ambient data. (4) The slope from linear regression analysis of separate inlet ambient air measurements indicated that the DARE data agreed with those from the PF/LIF system to within 7%. The linear regression line intercept was 216 parts per trillion by volume (pptv), which may indicate a positive interference in the DARE data, but the DARE data were closer to the PF/LIF data (50–100 pptv higher) at the lowest ambient ammonia levels. (5) The FP/COL method measured about 66% of the ammonia as determined by the PF/LIF technique and measured even lower fractional levels in the prepared samples. These low values indicate a loss of ammonia, possibly on the Teflon prefilter, under the conditions of this study (cold temperatures and generally low relative humidity). (6) The MOADS ambient air data were about 64% of the ammonia that was observed by the PF/LIF method for levels greater than about 1 ppbv, and below this level it overestimated ammonia. Problems with the MOADS calibrations and inlets may have been responsible. (7) Ambient air data from the one period of fog formation indicated that ambient ammonia was primarily partitioned into the condensed phase, leaving the interstitial air greatly depleted. Volatilization of absorbed ammonia from water droplets entrained in the sampled air appeared to influence the MOADS system. This did not appear to affect the FP/COL, CAD/IC, or PF/LIF results as a result of fast sample flows and/or operation at ambient temperatures.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/92JD00721
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1992
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  • 8
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    Ozone and alkyl nitrate formation from the Deepwater Horizon oil spill atmospheric emissions : OZONE AND ALKYL NITRATES FROM DWH
    American Geophysical Union (AGU) ; 2012
    In:  Journal of Geophysical Research: Atmospheres Vol. 117, No. D9 ( 2012-05-16), p. n/a-n/a
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 117, No. D9 ( 2012-05-16), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2011JD017150
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2012
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  • 9
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    HONO emission and production determined from airborne measurements over the Southeast U.S.
    American Geophysical Union (AGU) ; 2016
    In:  Journal of Geophysical Research: Atmospheres Vol. 121, No. 15 ( 2016-08-16), p. 9237-9250
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 121, No. 15 ( 2016-08-16), p. 9237-9250
    Abstract: Large HONO emissions observed from biomass burning, with HONO accounting for 2 to 14% of emitted reactive nitrogen Direct HONO emissions from power plants measured at night ranged from 0 to 0.4% of emitted NOx Within 15 pptv uncertainty, HONO was indistinguishable from zero outside of recently emitted plumes from known combustion sources
    Type of Medium: Online Resource
    ISSN: 2169-897X , 2169-8996
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrd.v121.15
    DOI: 10.1002/2016JD025197
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2016
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