Airborne Measurements of Pollutants over Urban and Rural Sites

Alkezweeny, A.J.; Drewes, D.R.

doi:10.1175/1520-0450(1977)016<0561:amopou>2.0.co;2

Cited by 5 publications

(2 citation statements)

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“…Photochemically produced ozone amounts sometimes increase downwind from pollution sources. As an example, Alkezweeny and Drewes (1977) found that ozone mixing ratios increased by more than a factor of 2 (to 0.200 ppm) at a distance of 150 km downwind from St. Louis.…”

Section: Interference By Ozone Produced In Polluted Airmentioning

confidence: 99%

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air

Komhyr¹,

Evans²

1980

Geophysical Research Letters

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Total ozone measurements made with Dobson spectrophotometers in polluted air are subject to errors caused by interfering trace gas species that absorb solar ultraviolet radiation. While such interference is probably non‐existent or small at the majority of Dobson instrument stations throughout the world, errors of up to 25% and 5%, resulting from absorption by SO2 and NO2 respectively, may occur occasionally at a few stations located in extremely polluted atmospheres. Interference by other absorbers, including N2O5, H2O2, HNO3, acetyldehyde, acetone, and acrolein has been found to be negligible. Ozone produced photochemically in polluted near‐surface air may occasionally constitute from 5% to 10% of the atmospheric total ozone column. Such ozone interferes with measurements of atmospheric background total ozone.

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Section: Interference By Ozone Produced In Polluted Airmentioning

confidence: 99%

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air

Komhyr¹,

Evans²

1980

Geophysical Research Letters

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“…The latter type of measurement is most often centered on regional to continental measurements in the free troposphere with less direct focus on individual city and local scale emissions into the planetary boundary layer (PBL). Aircraft studies of emissions fluxes have been completed but often with a focus on air quality issues − . Trainer et al and Ryerson et al both implemented aircraft measurements for urban plume studies with the former citing an uncertainty of a factor of 2, primarily due to uncertainty in the wind speed.…”

Section: Introductionmentioning

confidence: 99%

Aircraft-Based Measurements of the Carbon Footprint of Indianapolis

Mays

Shepson

Stirm

et al. 2009

Environ. Sci. Technol.

182

226

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The quantification of greenhouse gas emissions requires high precision measurements made with high spatial resolution. Here we describe measurements of carbon dioxide (CO2) and methane (CH4) conducted using Purdue University's Airborne Laboratory for Atmospheric Research (ALAR), aimed at the quantification of the "footprints" for these greenhouse gases for Indianapolis, IN. A cavity ring-down spectrometer measured atmospheric concentrations, and flask samples were obtained at various points for comparison. Coupled with pressure, temperature, and model-derived horizontal winds, these measurements allow for flux estimation. Long horizontal transects were flown perpendicular to the wind downwind of the city. Emissions were calculated using the wind speed and the difference between the concentration in the plume and the background concentration. A kriging method is applied to interpolate the measured values to a vertical plane traced out by the flight pattern within the mixed layer. Results show the urban plume is clearly distinguishable in the downwind concentrations for most flights. Additionally, there is large variability in the measured day-to-day emissions fluxes as well as in the relative CH4 and CO2 fluxes. Uncertainties in the method are discussed, and its potential utilityin determining sector-based emission factors is shown.

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Urban Boundary Layer

AuerJr.¹

1981

Metromex: A Review and Summary

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Airborne Measurements of Pollutants over Urban and Rural Sites

Cited by 5 publications

References 0 publications

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air

Aircraft-Based Measurements of the Carbon Footprint of Indianapolis

Urban Boundary Layer

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Airborne Measurements of Pollutants over Urban and Rural Sites

Cited by 5 publications

References 0 publications

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO2, NO2, and photochemically produced O3 in polluted air

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO2, NO2, and photochemically produced O3 in polluted air

Aircraft-Based Measurements of the Carbon Footprint of Indianapolis

Urban Boundary Layer

Contact Info

Product

Resources

About

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air

Dobson spectrophotometer total ozone measurement errors caused by interfering absorbing species such as SO₂, NO₂, and photochemically produced O₃ in polluted air