A Laser-induced Fluorescence Instrument for Detecting Tropospheric OH and HO2: Characteristics and Calibration

Faloona, I. C.; Tan, David; Lesher, R.; Hazen, N. L.; Frame, Christopher L.; Simpas, James Bernard; Harder, Hartwig; Martínez, Mònica; Carlo, Piero Di; Ren, Xinrong; Brune, William H.

doi:10.1023/b:joch.0000021036.53185.0e

Cited by 192 publications

(197 citation statements)

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“…46,47 OH was measured by laser induced fluorescence (LIF) at low pressure and HO 2 was converted to OH through its reaction with NO prior to detection by LIF. 48 Total OH reactivity was measured by observing the decay rate of OH when exposed to ambient air. 49 Further details of the OH measurements are given in the Supporting Information.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Observational Insights into Aerosol Formation from Isoprene

Worton

Surratt

LaFranchi

et al. 2013

Environ. Sci. Technol.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Observational Insights into Aerosol Formation from Isoprene

Worton

Surratt

LaFranchi

et al. 2013

Environ. Sci. Technol.

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117

161

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“…nasa.gov/cgi-bin/arcstat-c). Although OH and HO 2 were measured both by the NCAR chemical ionization mass spectrometer (Cantrell et al, 2003a) and the Pennsylvania State laser induced fluorescence (LIF) techniques (Faloona et al, 2004), we use the LIF OH and HO 2 measurements in our model due to the more extensive coverage at high altitudes.…”

Section: Measurementsmentioning

confidence: 99%

Global and regional effects of the photochemistry of CH3O2NO2: evidence from ARCTAS

et al. 2011

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Abstract. Using measurements from the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) experiment, we show that methyl peroxy nitrate (CH 3 O 2 NO 2 ) is present in concentrations of ∼5-15 pptv in the springtime arctic upper troposphere. We investigate the regional and global effects of CH 3 O 2 NO 2 by including its chemistry in the GEOS-Chem 3-D global chemical transport model. We find that at temperatures below 240 K inclusion of CH 3 O 2 NO 2 chemistry results in decreases of up to ∼20 % in NO x , ∼20 % in N 2 O 5 , ∼5 % in HNO 3 , ∼2 % in ozone, and increases in methyl hydrogen peroxide of up to ∼14 %. Larger changes are observed in biomass burning plumes lofted to high altitude. Additionally, by sequestering NO x at low temperatures, CH 3 O 2 NO 2 decreases the cycling of HO 2 to OH, resulting in a larger upper tropospheric HO 2 to OH ratio. These results may impact some estimates of lightning NO x sources as well as help explain differences between models and measurements of upper tropospheric composition.

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“…Within the photolysis region, the concentration of OH is determined as: (Cantrell et al, 1997), φ OH, 189.4 nm is the photodissociation quantum yield of OH (φ OH, 189.4 nm =1), F 184.9 nm is the photon flux of the lamp, and t is the photolysis exposure time. Calibration of the HIRAC FAGE instrument utilizes a "wand" system, initially developed by Faloona et al (2004). Briefly, humidified air at atmospheric pressure is passed through a 1.27 cm×1.27 cm square internal section blackanodised aluminium tube of 30 cm length known as the "wand".…”

Section: Instrument Calibrationmentioning

confidence: 99%

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

et al. 2007

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Abstract. The design of a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) is described and initial results obtained from HIRAC are presented. The ability of HIRAC to perform in-situ laser-induced fluorescence detection of OH and HO 2 radicals with the Fluorescence Assay by Gas Expansion (FAGE) technique establishes it as internationally unique for a chamber of its size and pressure/temperature variable capabilities. In addition to the FAGE technique, HIRAC features a suite of analytical instrumentation, including: a multipass FTIR system; a conventional gas chromatography (GC) instrument and a GC instrument for formaldehyde detection; NO/NO 2 , CO, O 3 , and H 2 O vapour analysers. Ray tracing simulations and NO 2 actinometry have been utilized to develop a detailed model of the radiation field within HIRAC. Comparisons between the analysers and the FTIR coupled to HIRAC have been performed, and HIRAC has also been used to investigate pressure dependent kinetics of the chlorine atom reaction with ethene and the reaction of O 3 and t-2-butene. The results obtained are in good agreement with literature recommendations and Master Chemical Mechanism predictions. HIRAC thereby offers a highly instrumented platform with the potential for: (1) high precision kinetics investigations over a range of atmospheric conditions; (2) detailed mechanism development, significantly enhanced according to its capability for measuring radicals; and (3) field instrument intercomparison, calibration, development, and investigations of instrument response at a range of atmospheric conditions.Correspondence to: P. W. Seakins

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A Laser-induced Fluorescence Instrument for Detecting Tropospheric OH and HO₂: Characteristics and Calibration

Cited by 192 publications

References 50 publications

Observational Insights into Aerosol Formation from Isoprene

Observational Insights into Aerosol Formation from Isoprene

Global and regional effects of the photochemistry of CH<sub>3</sub>O<sub>2</sub>NO<sub>2</sub>: evidence from ARCTAS

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

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A Laser-induced Fluorescence Instrument for Detecting Tropospheric OH and HO2: Characteristics and Calibration

Cited by 192 publications

References 50 publications

Observational Insights into Aerosol Formation from Isoprene

Observational Insights into Aerosol Formation from Isoprene

Global and regional effects of the photochemistry of CH&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;NO&lt;sub&gt;2&lt;/sub&gt;: evidence from ARCTAS

Design of and initial results from a Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC)

Contact Info

Product

Resources

About

A Laser-induced Fluorescence Instrument for Detecting Tropospheric OH and HO₂: Characteristics and Calibration

Global and regional effects of the photochemistry of CH<sub>3</sub>O<sub>2</sub>NO<sub>2</sub>: evidence from ARCTAS