The Radiative Transfer Characteristics of the O2 Infrared Atmospheric Band in Limb-Viewing Geometry

He, Weiwei; Wu, Kang; Feng, Yongqiang; Fu, Di; Chen, Zhenwei; Li, Faquan

doi:10.3390/rs11222702

Cited by 11 publications

(9 citation statements)

References 28 publications

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“…The model is continuously developing and enriching itself with new data and fields of application. Currently, the YM2011 model is included in a number of algorithms (GRANADA and ALI-ARMS) and is used for calculations [94]. In the near future, the authors plan to solve the problem of expanding the application of the model for twilight conditions.…”

Section: Discussionmentioning

confidence: 99%

Model of Daytime Oxygen Emissions in the Mesopause Region and Above: A Review and New Results

Yankovsky

Vorobeva

2020

Atmosphere

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Atmospheric emissions of atomic and molecular oxygen have been observed since the middle of 19th century. In the last decades, it has been shown that emissions of excited oxygen atom O(1D) and molecular oxygen in electronically–vibrationally excited states O2(b1Σ+g, v) and O2(a1Δg, v) are related by a unified photochemical mechanism in the mesosphere and lower thermosphere (MLT). The current paper consists of two parts: a review of studies related to the development of the model of ozone and molecular oxygen photodissociation in the daytime MLT and new results. In particular, the paper includes a detailed description of formation mechanism for excited oxygen components in the daytime MLT and presents comparison of widely used photochemical models. The paper also demonstrates new results such as new suggestions about possible products for collisional reactions of electronically–vibrationally excited oxygen molecules with atomic oxygen and new estimations of O2(b1Σ+g, v = 0–10) radiative lifetimes which are necessary for solving inverse problems in the lower thermosphere. Moreover, special attention is given to the “Barth’s mechanism” in order to demonstrate that for different sets of fitting coefficients its contribution to O2(b1Σ+g, v) and O2(a1Δg, v) population is neglectable in daytime conditions. In addition to the review and new results, possible applications of the daytime oxygen emissions are presented, e.g., the altitude profiles O(3P), O3 and CO2 can be retrieved by solving inverse photochemical problems when emissions from electronically vibrationally excited states of O2 molecule are used as proxies.

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Section: Discussionmentioning

confidence: 99%

Model of Daytime Oxygen Emissions in the Mesopause Region and Above: A Review and New Results

Yankovsky

Vorobeva

2020

Atmosphere

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“…For the accurate simulation of the observed O 2 (a 1 ∆ g ) band spectral brightness, interference from the upper layers due to self-absorption must be taken into account in the calculation of the VER path integrals. The VER of any rotation line J at a point along the LOS can be denoted as η J , and the spectral brightness of this rotational line as a function of wavenumber v can be written as [17]: (9) where…”

Section: Limb Radiationmentioning

confidence: 99%

“…Compared with the atmospheric band used by the Wind Imaging Interferometer (WINDII) [14], High Resolution Doppler Imager (HRDI) [15], and TIMED Doppler Interferometer (TIDI) [16], the infrared atmospheric band has greater advantages of bright signal and extended altitude coverage, which make it suitable for wind observing at a lower altitude (from about 30 km). However, the infrared atmospheric band can be observed both in emission and absorption at lower altitudes, and the weight of the emission signal decreases with the reduction of the altitude, which may lead to a reduction in wind measurement precision, especially at low altitudes [17]. In 2018, Wu et al analyzed the influence of the spectral interference on the wind measurement, but only the Rayleigh scattering was taken into account [13].…”

Section: Introductionmentioning

confidence: 99%

“…In 2018, Wu et al analyzed the influence of the spectral interference on the wind measurement, but only the Rayleigh scattering was taken into account [13]. However, the Mie scattering and the reflection of clouds and the Earth's surface also contribute significantly to the scattered sunlight continuum background, especially at low tangent heights [17].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Scattered Sunlight for Wind Measurements with the O2(a1Δg) Dayglow

Wang

et al. 2022

Remote Sensing

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Observing the O2(a1Δg) dayglow with the limb-viewing DASH instrument enables remote sensing of neutral wind in near space. Many advantages are gained by using this new approach, but the influence factors on measurement accuracy have not been thoroughly investigated. This paper reports the quantitative evaluation of the wind error caused by scattered sunlight. The spectral concept of the O2(a1Δg) band and the measurement technique are briefly described. A comprehensive truth model simulation that is based on atmospheric limb radiance spectra and the instrument concept are used to obtain interferogram images. The algorithm, which uses these images to retrieve the interferogram containing information solely from the target altitude, is described. The self-absorption effect is taken into account in the unraveling of the line-of-sight integration. The influence of scattered sunlight on the limb-viewing weight and signal-to-noise ratio, two definitive factors for wind definitive factors, are also described. Representative wind precision profiles and their variation with surface albedo, aerosol loading, and cloud are presented. This indicates that the random error for Doppler wind is in the range of 2–3 m/s for the tangent height range from 45–80 km, and the wind precision under 45 km suffers significantly from scattered sunlight background.

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“…In our research, there are very few complete models for UV absorption and even fewer that cover wavelengths below 300 nm [7][8][9][10][11]. To give an example, [12][13][14] aims to calculate the high-altitude atmospheric emission effects due to "day-glow." However, it does this by looking through Earth's upper atmospheric layers.…”

Section: Introductionmentioning

confidence: 99%

A Spherical Shells Model of Atmospheric Absorption for Instrument Calibration

Donders

Vigil

Kobelski

et al. 2023

J. Phys.: Conf. Ser.

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We present a model for atmospheric absorption of solar ultraviolet (UV) radiation. The initial motivation for this work is to predict this effect and correct it in Sounding Rocket (SR) experiments. In particular, the Full-sun Ultraviolet Rocket Spectrograph (FURST) is anticipated to launch in mid-2023. FURST has the potential to observe UV absorption while imaging solar spectra between 120-181 nm, at a resolution of ℛ > 2 ⋅ 10 4 ( Δ V < ± 15 km / s ) , and at altitudes of between ≈ 110-255 km. This model uses estimates for density and temperature, as well as laboratory measurements of the absorption cross-section, to predict the UV absorption of solar radiation at high altitudes. Refraction correction is discussed and partially implemented but is negligible for the results presented. Absorption by molecular Oxygen is the primary driver within the UV spectral range of our interest. The model is built with a wide range of applications in mind. The primary result is a method for inversion of the absorption cross-section from images obtained during an instrument flight, even if atmospheric observations were not initially intended. The potential to obtain measurements of atmospheric properties is an exciting prospect, especially since sounding rockets are the only method currently available for probing this altitude in-situ. Simulation of noisy spectral images along the FURST flight profile is performed using data from the High-Resolution Telescope and Spectrograph (HRTS) SR and the FISM2 model for comparison. Analysis of these simulated signals allows us to capture the Signal-to-Noise Ratio (SNR) of FURST and the capability to measure atmospheric absorption properties as a function of altitude. Based on the prevalence of distinct spectral features, our calculations demonstrate that atmospheric absorption may be used to perform wavelength calibration from in-flight data.

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The Radiative Transfer Characteristics of the O2 Infrared Atmospheric Band in Limb-Viewing Geometry

Cited by 11 publications

References 28 publications

Model of Daytime Oxygen Emissions in the Mesopause Region and Above: A Review and New Results

Model of Daytime Oxygen Emissions in the Mesopause Region and Above: A Review and New Results

Influence of Scattered Sunlight for Wind Measurements with the O2(a1Δg) Dayglow

A Spherical Shells Model of Atmospheric Absorption for Instrument Calibration

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