Instrumentation for Chemical Species Measurements in the Troposphere and Stratosphere

Kolb, C. E.

doi:10.1002/rog.1991.29.s1.25

Cited by 8 publications

(3 citation statements)

References 183 publications

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“…Similar challenges are faced when attempting to measure many important atmospheric compounds (I, 2). This is especially true for the hydroxyl radical because its highly reactive nature makes it particularly difficult to measure.…”

Section: Report Sulfate Aerosolmentioning

confidence: 97%

The Elusive Hydroxyl Radical Measuring OH in the Atmosphere

Eisele¹,

Bradshaw²

1993

Anal. Chem.

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Section: Report Sulfate Aerosolmentioning

confidence: 97%

The Elusive Hydroxyl Radical Measuring OH in the Atmosphere

Eisele¹,

Bradshaw²

1993

Anal. Chem.

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“…Infrared absorption spectroscopy using tunable diode lasers ( t d l s ) has received wide usage for sensitive measurements of atmospheric trace gases over the past ten years (Schiff et al 1983(Schiff et al , 1994Kolb 1991). Due to the difficulties of using these cryogenically cooled laser diodes and to the operator expertise required to build, align and maintain such systems, t d l s have only recently been used for trace gas flux measurements in the field (Wienhold et al 1994;Edwards et al 1994;Verma et al 1992;Hovde et al 1995;Anderson & Zahniser 1992).…”

Section: Introductionmentioning

confidence: 99%

Measurement of trace gas fluxes using tunable diode laser spectroscopy

1995

Phil. Trans. R. Soc. Lond. A

135

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A fast-response, high precision, tunable diode laser spectrometer has been developed for field measurements of methane and nitrous oxide fluxes using the eddy correlation method. The instrument uses a novel multiple-pass absorption cell with astigmatic mirrors to provide a long absorption path length (36 m) in a small volume (0.3 l). The combination permits rapid response with sufficient sensitivity for eddy correlation flux measurements over a wide range of meteorological conditions. Signal processing uses a least-squares fitting algorithm to determine absolute trace gas concentrations directly from the absorption spectra using spectral line parameters at data rates up to 20 Hz. The precision for methane and nitrous oxide is 0.1% of ambient levels with a 1 s averaging time. Extensions of the method to measurements of surface-reactive gases such as nitric acid and ammonia are possible using rapid sampling techniques to minimize surface interactions.

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“…Similar challenges are faced when attempting to measure many important atmospheric compounds (2,2). This is especially true for the hydroxyl radical because its highly reactive nature makes it particularly difficult to measure. Because of its rapid destruction on surfaces, great care must be exercised when intro-ducing it from the free atmosphere into an analysis device, and the preparation of a stable calibration standard is not possible.…”

mentioning

confidence: 98%