Technical note: Evaluation of standard ultraviolet absorption ozone monitors in a polluted urban environment

Dunlea, E. J.; Herndon, S. C.; Nelson, David D.; Volkamer, Rainer; Lamb, Brian; Allwine, E.; Grütter, Michel; Villegas, Carolina; Márquez, C.; Blanco, S.; Cárdenas, B.; Kolb, C. E.; Molina, Luisa T.; Molina, Mario J.

doi:10.5194/acp-6-3163-2006

Cited by 41 publications

(41 citation statements)

References 44 publications

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“…A significant difference is observed during afternoon hours. The main cause for the observed discrepancy is the interference in the chemiluminescence measurements [Dunlea et al, 2007], although some difficulties remain when comparing a point measurement with a long path measurement (DOAS) due to spatial incoherence, which is expected to be more of an issue overnight [Dunlea et al, 2006;San Martini et al, 2006]. The main interfering constituents are the oxidation products of NO x such as HNO 3 , PAN, and other organic nitrates [Winer et al, 1974;U.S.…”

Section: Comparison With Doas Measurementsmentioning

confidence: 99%

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

et al. 2008

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[1] We present an approach to infer ground-level nitrogen dioxide (NO 2 ) concentrations by applying local scaling factors from a global three-dimensional model (GEOS-Chem) to tropospheric NO 2 columns retrieved from the Ozone Monitoring Instrument (OMI) onboard the Aura satellite. Seasonal mean OMI surface NO 2 derived from the standard tropospheric NO 2 data product (Version 1.0.5, Collection 3) varies by more than two orders of magnitude (<0.1->10 ppbv) over North America. Two ground-based data sets are used to validate the surface NO 2 estimate and indirectly validate the OMI tropospheric NO 2 retrieval: photochemical steady-state (PSS) calculations of NO 2 based on in situ NO and O 3 measurements, and measurements from a commercial chemiluminescent NO 2 analyzer equipped with a molybdenum converter. An interference correction algorithm for the latter is developed using laboratory and field measurements and applied using modeled concentrations of the interfering species. The OMI-derived surface NO 2 mixing ratios are compared with an in situ surface NO 2 data obtained from the U.S. Environmental Protection Agency's Air Quality System (AQS) and Environment Canada's National Air Pollution Surveillance (NAPS) network for 2005 after correcting for the interference in the in situ data. The overall agreement of the OMI-derived surface NO 2 with the corrected in situ measurements and PSS-NO 2 is À11-36%. A larger difference in winter/spring than in summer/fall implies a seasonal bias in the OMI NO 2 retrieval. The correlation between the OMI-derived surface NO 2 and the ground-based measurements is significant (correlation coefficient up to 0.86) with a tendency for higher correlations in polluted areas. The satellite-derived data base of ground level NO 2 concentrations could be valuable for assessing exposures of humans and vegetation to NO 2 , supplementing the capabilities of the ground-based networks, and evaluating air quality models and the effectiveness of air quality control strategies.Citation: Lamsal, L. N., R.

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Section: Comparison With Doas Measurementsmentioning

confidence: 99%

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

et al. 2008

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“…Dunlea et al 19 explored this question using data from the Mexico City region. They observed positive and negative differences between UV O 3 monitors and long-path DOAS instruments, depending on the particular site and the time of day.…”

Section: Effect Of Selected Chemicals On Omentioning

confidence: 99%

“…Arshinov et al 17 observed large differences between UV and solid-phase chemiluminescence O 3 measurements aboard a research ship and attributed the discrepancies to interference with the UV instrument caused by fine particles. Dunlea et al 19 compared UV absorption, DOAS, and open-path Fourier transform infrared spectroscopy O 3 measurements made at two urban locations. Average discrepancies between the UV instruments and the spectroscopic methods ranged from ϩ13 to Ϫ18% and were attributed to incorrect calibration factors for the UV O 3 monitors, although they acknowledged that interferences could not be ruled out.…”

Section: Introductionmentioning

confidence: 99%

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A Re-Examination of Ambient Air Ozone Monitor Interferences

Spicer¹,

Joseph

Ollison

2010

Journal of the Air & Waste Management Association

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“…Past studies of VOC interferences have typically been of three types: (1) measurement of total net ozone biases during irradiation of simulated atmospheres in smog chambers (Kleindeist et al, 1993;Leston et al, 2005), (2) simultaneous atmospheric measurements by different analyzers using different measurement techniques (Ollison et al, 2013;Dunlea et al, 2006), and (3) addition of selected VOCs to ozone analyzers to determine the interference from that particular VOC (Grosjean and Harrison, 1985;Spicer et al, 2010). All of these approaches contribute to our understanding of the significance of VOC interferences in ozone monitors; however, we have chosen the latter approach to initially evaluate our heated graphite scrubber because it is a more direct approach and reproducible signals can be easily quantified.…”

Section: Volatile Organic Compounds (Vocs)mentioning

confidence: 99%

Use of a heated graphite scrubber as a means of reducing interferences in UV-absorbance measurements of atmospheric ozone

et al. 2017

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Abstract. A new solid-phase scrubber for use in conventional ozone (O 3 ) photometers was investigated as a means of reducing interferences from other UV-absorbing species and water vapor. It was found that when heated to 100-130 • C, a tubular graphite scrubber efficiently removed up to 500 ppb ozone and ozone monitors using the heated graphite scrubber were found to be less susceptible to interferences from water vapor, mercury vapor, and aromatic volatile organic compounds (VOCs) compared to conventional metal oxide scrubbers. Ambient measurements from a graphite scrubberequipped photometer and a co-located Federal equivalent method (FEM) ozone analyzer showed excellent agreement over 38 days of measurements and indicated no loss in the scrubber's ability to remove ozone when operated at 130 • C. The use of a heated graphite scrubber was found to reduce the interference from mercury vapor to ≤ 3 % of that obtained using a packed-bed Hopcalite scrubber. For a series of substituted aromatic compounds (ranging in volatility and absorption cross section at 253.7 nm), the graphite scrubber was observed to consistently exhibit reduced levels of interference, typically by factors of 2.5 to 20 less than with Hopcalite. Conventional solid-phase scrubbers also exhibited complex VOC adsorption and desorption characteristics that were dependent upon the relative humidity (RH), volatility of the VOC, and the available surface area of the scrubber. This complex behavior involving humidity is avoided by use of a heated graphite scrubber. These results suggest that heated graphite scrubbers could be substituted in most ozone photometers as a means of reducing interferences from other UV-absorbing species found in the atmosphere. This could be particularly important in ozone monitoring for compliance with the United States (U.S.) Clean Air Act or for use in VOC-rich environments such as in smog chambers and monitoring indoor air quality.

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Technical note: Evaluation of standard ultraviolet absorption ozone monitors in a polluted urban environment

Cited by 41 publications

References 44 publications

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

A Re-Examination of Ambient Air Ozone Monitor Interferences

Use of a heated graphite scrubber as a means of reducing interferences in UV-absorbance measurements of atmospheric ozone

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