First mesopause Na retrievals from satellite Na D‐line nightglow observations

Savigny, Christian von; Langowski, Martin; Zilker, Bianca; Burrows, J. P.; Fussen, D.; Sofieva, Viktoria

doi:10.1002/2016gl071313

Cited by 9 publications

(9 citation statements)

References 23 publications

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“…The modelled intensities are scaled by a factor of 0.13 to produce a correlation plot (lower panel) with a slope of 1 when forced through the origin. That is a quantum yield of 13 ± 3 % for the Fe + O 3 reaction, which is much closer to the laboratory measurement of West & Broida (1975) (2-6 %) than the previous modelling study of Saran Figure 6. Comparison of the measured and modelled FeO emission intensity.…”

Section: Methodssupporting

confidence: 83%

“…This suggests that the quantum yields estimated in this study could be lower by a factor of ∼ 2. This would bring the FeO quantum yield into even better agreement with the laboratory study of West & Broida (1975). The Na quantum yield would then be close to the lower end of the range of 0.05-0.2 that was estimated from a combined rocket-borne and lidar experiment (Clemesha et al, 1995).…”

Section: Methodssupporting

confidence: 53%

“…Evans et al (2010) used the OSIRIS (Optical Spectrograph and InfraRed Imager System) spectrometer on the Odin satellite to detect the feature in the night-sky continuum. They found that the spectral shape of FeO from their study matched the laboratory spectrum of West & Broida (1975). Gattinger et al (2011) calculated a theoretical spectrum using laboratory data and the spectra obtained from OSIRIS.…”

Section: Introductionmentioning

confidence: 76%

“…Chemiluminescent emission from electronically excited FeO appears as a pseudo-continuum at wavelengths between 0.5 and 0.72 µm, termed the "orange arc" bands. The emission is produced by the reaction Fe + O 3 , with a quantum yield of ∼ 2 %, measured in a laboratory study (West & Broida, 1975). Being part of the night-sky continuum emission implies that it is also contaminated by other airglow continua (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Measuring FeO variation using astronomical spectroscopic observations

et al. 2017

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Abstract. Airglow emission lines of OH, O2, O and Na are commonly used to probe the MLT (mesosphere–lower thermosphere) region of the atmosphere. Furthermore, molecules like electronically excited NO, NiO and FeO emit a (pseudo-) continuum. These continua are harder to investigate than atomic emission lines. So far, limb-sounding from space and a small number of ground-based low-to-medium resolution spectra have been used to measure FeO emission in the MLT. In this study the medium-to-high resolution echelle spectrograph X-shooter at the Very Large Telescope (VLT) in the Chilean Atacama Desert (24°37′ S, 70°24′ W; 2635 m) is used to study the FeO pseudo-continuum in the range from 0.5 to 0.72 µm based on 3662 spectra. Variations of the FeO spectrum itself, as well as the diurnal and seasonal behaviour of the FeO and Na emission intensities, are reported. These airglow emissions are linked by their common origin, meteoric ablation, and they share O3 as a common reactant. Major differences are found in the main emission peak of the FeO airglow spectrum between 0.58 and 0.61 µm, compared with a theoretical spectrum. The FeO and Na airglow intensities exhibit a similar nocturnal variation and a semi-annual seasonal variation with equinoctial maxima. This is satisfactorily reproduced by a whole atmosphere chemistry climate model, if the quantum yields for the reactions of Fe and Na with O3 are 13 ± 3 and 11 ± 2 % respectively. However, a comparison between the modelled O3 in the upper mesosphere and measurements of O3 made with the SABER satellite instrument suggests that these quantum yields may be a factor of ∼ 2 smaller.

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Section: Methodssupporting

confidence: 83%

Section: Methodssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Measuring FeO variation using astronomical spectroscopic observations

et al. 2017

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show abstract

“…The modelled intensities are scaled by a factor of 0.13 to produce a correlation plot (lower panel) with a slope of 1 when forced through the origin. That is a quantum yield of 13 ± 3 % for the Fe + O 3 reaction, which is much closer to the laboratory measurement of West & Broida (1975) (2-6 %) than the previous modelling study of Saran (Helmer and Plane, 1994), a 6 % uncertainty in the absolute calibration of the observed FeO intensity, and a 2 % uncertainty from the correlation plot in Fig. 6.…”

Section: Methodssupporting

confidence: 74%

Response to Referee #2

Unterguggenberger¹

2017

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Airglow emission lines of OH, O 2 , O and Na are commonly used to probe the MLT (mesosphere-lower thermosphere) region of the atmosphere. Furthermore, molecules like electronically excited NO, NiO and FeO emit a (pseudo-) continuum. These continua are harder to investigate than atomic emission lines. So far, limb-sounding from space and a small number of ground-based low-to-medium resolution spectra have been used to measure FeO emission in the MLT. In this study the medium-to-high resolution echelle spectrograph X-shooter at the Very Large Telescope (VLT) in the Chilean Atacama Desert (24 • 37 S, 70 • 24 W; 2635 m) is used to study the FeO pseudo-continuum in the range from 0.5 to 0.72 µm based on 3662 spectra. Variations of the FeO spectrum itself, as well as the diurnal and seasonal behaviour of the FeO and Na emission intensities, are reported. These airglow emissions are linked by their common origin, meteoric ablation, and they share O 3 as a common reactant. Major differences are found in the main emission peak of the FeO airglow spectrum between 0.58 and 0.61 µm, compared with a theoretical spectrum. The FeO and Na airglow intensities exhibit a similar nocturnal variation and a semiannual seasonal variation with equinoctial maxima. This is satisfactorily reproduced by a whole atmosphere chemistry climate model, if the quantum yields for the reactions of Fe and Na with O 3 are 13 ± 3 and 11 ± 2 % respectively. However, a comparison between the modelled O 3 in the upper mesosphere and measurements of O 3 made with the SABER satellite instrument suggests that these quantum yields may be a factor of ∼ 2 smaller.Published by Copernicus Publications on behalf of the European Geosciences Union.

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Airglow in the Earth atmosphere: basic characteristics and excitation mechanisms

Savigny

2017

ChemTexts

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First mesopause Na retrievals from satellite Na D‐line nightglow observations

Cited by 9 publications

References 23 publications

Measuring FeO variation using astronomical spectroscopic observations

Measuring FeO variation using astronomical spectroscopic observations

Response to Referee #2

Airglow in the Earth atmosphere: basic characteristics and excitation mechanisms

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