Prototype FAGE determination of NO2

George, Linda A.; O’Brien, Robert

doi:10.1007/bf00048073

Cited by 25 publications

(30 citation statements)

References 39 publications

(48 reference statements)

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“…Various attempts have been made for in situ NO 2 measurements. There have been a few documented direct LIF measurements [e.g., George and O'Brien , 1991; Thornton et al , 2000; Matsumi et al , 2001; Matsumoto et al , 2001]. This type of system, however, has not been widely used in field studies.…”

Section: Introductionmentioning

confidence: 99%

Measurement of NO₂ by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

et al. 2003

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[1] An airborne instrument for in situ measurements of tropospheric nitrogen dioxide (NO 2 ) was developed using the photolytic conversion technique followed by chemiluminescence detection of NO. This instrument was used for the measurements of NO 2 on board the NASA P-3B aircraft during the Transport and Chemical Evolution Over the Pacific (TRACE-P) campaign. Comparison in the laboratory indicated less than 10% difference between our NO 2 instrument and two independent laser-induced fluorescence instruments in the NO 2 range of 30 parts per trillion by volume (pptv) to 50 ppbv. The magnitudes of potential errors in airborne tropospheric NO 2 measurements were further assessed using the TRACE-P data set. The systematic errors estimated for the median NO 2 mixing ratios, 70 pptv at 0-2 km (30 pptv at 2-8 km), were 19% (39%). The random errors for a 10 s integration time were estimated to be 5-10%, depending on altitude. The observed NO 2 mixing ratios were compared to those calculated by a photochemical box model. Overall, the calculated NO 2 values correlated very well with those observed (r 2 = 0.97), although the calculations were systematically higher than the observations by about 30%, except for the highest flight levels. The calculated/ observed NO 2 ratio remained nearly constant, having values close to 1.3 at 0-4 km, and decreased with altitude. The difference between the observed and model-calculated values, however, was within the combined uncertainty in the measurement and model calculation. The underlying causes for this difference are to be determined in future studies.

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Section: Introductionmentioning

confidence: 99%

Measurement of NO₂ by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

et al. 2003

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“…11 The instrument employs the second harmonic of the Nd:YAG laser at 532 nm as the excitation source. Fluorescence is separated from Rayleigh and chamber scattering by temporal filtering.…”

Section: Introductionmentioning

confidence: 99%

A laser induced fluorescence instrument for measuring tropospheric NO2

Fong

Brune

1997

Review of Scientific Instruments

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A new photolysis laser-induced fluorescence instrument for the detection of H 2 O and HDO in the lower stratosphere Rev. Sci. Instrum. 79, 064101 (2008); Nitrogen dioxide (NO 2 ), an essential gas in atmospheric chemistry, is almost always measured indirectly with just one technique: photolysis of NO 2 to NO, followed by detection of resulting NO. However, the photolysis introduces artifact signals that complicate the extraction of the NO 2 signal at low NO 2 volume mixing ratios. A new prototype instrument uses laser induced fluorescence to measure tropospheric NO 2 directly. The atmospheric fluorescence spectra measured with this instrument match the fluorescence spectra of NO 2 in a reference cell over the wavelength range 565.1-565.2 nm. This match indicates that fluorescence from other chemical species is not interfering with the measurements. The prototype's current detection limit is 280 parts per trillion ͑pptv͒ in 2.5 min with an absolute uncertainty of Ϯ15% ͑2 confidence͒. This detection limit, which can be improved with better optical filtering and more laser power, is currently adequate for urban air conditions.

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“…The advantage of such an approach is that simple, high power laser systems can be used instead of the relatively complicated narrow-linewidth laser systems described above. George and O'Brien demonstrated measurement of NO 2 in the laboratory using the 532 nm line from a 1.4 W Nd:YAG laser at 30 Hz (George & O'Brien, 1991). To measure the instrument's background, ambient air was sampled after flowing through FeSO 4 , which reduces NO 2 to NO.…”

Section: Single-photon No 2 Instrument Designmentioning

confidence: 99%

Fluorescence Methods

and¹,

Cohen²

2006

Analytical Techniques for Atmospheric Measurement

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Prototype FAGE determination of NO2

Cited by 25 publications

References 39 publications

Measurement of NO₂ by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

Measurement of NO₂ by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

A laser induced fluorescence instrument for measuring tropospheric NO2

Fluorescence Methods

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About

Prototype FAGE determination of NO2

Cited by 25 publications

References 39 publications

Measurement of NO2 by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

Measurement of NO2 by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

A laser induced fluorescence instrument for measuring tropospheric NO2

Fluorescence Methods

Contact Info

Product

Resources

About

Measurement of NO₂ by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign

Measurement of NO₂ by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE‐P) campaign