Mesospheric energy loss rates by OH and O&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; emissions at 23&amp;lt;sup&amp;gt;°&amp;lt;/sup&amp;gt;S

Fagundes, P. R.; Gobbi, D.; Takahashi, H.; Sahai, Y.

doi:10.1007/s00585-997-0797-4

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Rotational temperature of atmospheric molecular constituents can be obtained by photometric measurement of airglow band emissions (e.g., Meriwether, 1975;Takahashi et al, 1989;Wiens et al, 1991Wiens et al, , 1995Fagundes et al, 1997). Doppler wind and temperature of the upper atmosphere are obtained by high-resolution interferometric measurements (e.g., Killeen andRoble, 1988, Rees et al, 1990;Conde and Smith, 1995;Hernandez and Roble, 1995;Dyson et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Development of Optical Mesosphere Thermosphere Imagers (OMTI)

et al. 2014

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The Optical Mesosphere Thermosphere Imagers (OMTI) have been developed to investigate the dynamics of the upper atmosphere through nocturnal airglow emissions. The OMTI consist of an imaging Fabry-Perot interferometer, three all-sky cooled-CCD cameras, three tilting photometers, and a Spectral Airglow Temperature Imager (SATI) with two container houses to install them in. These instruments measure wind, temperature and 2-dimensional airglow patterns in the upper atmosphere at multi-wavelengths of OI (557.7 nm and 630.0 nm), OH (6-2) bands, O 2 (0, 1) bands, and Na (589.3 nm), simultaneously. Examples of the data are shown for the cameras, the photometers, and the SATI based on the airglow observation at a mid-latitude station in Japan. Good correlation of the photometer and SATI observations is obtained. A comparison is shown for small-and large-scale wave structures in airglow images at four wavelengths around the mesopause region using four cooled-CCD cameras. We found an event during which large-scale bands, small-scale row-like structures, and large-scale front passage occur simultaneously.

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Section: Introductionmentioning

confidence: 99%

Development of Optical Mesosphere Thermosphere Imagers (OMTI)

et al. 2014

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“…The intensity recorded at the ground can be used, with appropriate assumptions provided by photochemical models, satellite experiments, or rocket experiments, to reconstruct the associated vertical profile of energy deposition and atmospheric heating. We note that Fagundes et al [1997] used a similar approach to derive vertical profiles of chemiluminescent energy loss (in kelvins per day) from ground-based measurements. The approach suggested below permits the actual atmospheric heating profile to be estimated from the ground-based measurements, not just the profile of chemiluminescent emission that has no atmospheric consequence.…”

Section: Application To Ground-based Data and Other Airglow Featuresmentioning

confidence: 99%

A new perspective on the molecular oxygen and hydroxyl airglow emissions

Mlynczak¹

1999

J. Geophys. Res.

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The mesospheric molecular oxygen and hydroxyl airglow emissions have traditionally been measured in order to derive minor species abundances or to diagnose dynamical phenomena. We present a new interpretation of these airglow emissions and show them to be fundamental measures of energy deposition from which rates of atmospheric heating are readily derived. The heating rate due to absorption of ultraviolet radiation in the Hartley band of ozone may be derived from simultaneous measurements of the oxygen atmospheric band and infrared atmospheric band volume emission rates independent of knowledge of the ozone density, the solar irradiance, and the ozone absorption cross sections. The heating rates due to key exothermic reactions may be derived directly from appropriate airglow observations independent of the reactant concentrations and the temperature-dependent reaction rates. The accuracy of heating rates derived directly from airglow measurements is also inherently higher than that obtained in standard approaches. We suggest that heating rates derived in this manner be treated as data products and that they be compared with numerical model computations to enhance understanding of atmospheric thermodynamics. An initial comparison of airglow-derived energy deposition rates with deposition rates traditionally computed from numerical models shows agreement to within 20% for the Hartley band of ozone in the lower and upper mesosphere.

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A chemical perspective of day and night tropical (10°N–15°N) mesospheric inversion layers

et al. 2017

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The various occurrence characteristics of day and night tropical (10°N–15°N, 60°E–90°E) mesospheric inversion layers (MILs) are studied by using TIMED Sounding of the Atmosphere using Broadband Emission Radiometry satellite data products of kinetic temperature; volume mixing ratios of O, H, and O3; volume emission rates of O2 (1Δ) and OH (1.6 µm channel), and chemical heating rates due to seven dominant exothermic reactions among H, O, O2, O3, OH, HO2, and CO2 cooling rates for the year 2011. Although both dynamics and chemistry play important roles, the present study mainly focuses on the chemical processes involved in the formation of day and night MILs. It is found that the upper level height of daytime (nighttime) MIL descends (ascends) from ~88 km (~80 km) in winter to ~72 km (~90 km) in summer. The day and night inversion amplitudes are correlated with total chemical heating rates and CO2 cooling rates, and they show semi annual variation with larger (smaller) values during equinoxes (solstices). The daytime (nighttime) inversion layers are predominantly due to the exothermic reaction, R5: O + O + M → O2 + M and R6: O + O2 + M → O3 + M (R3: H + O3 → OH + O2). In addition, the CO2 causes large cooling at the top and small heating at the bottom levels of both day and night MILs. In the absence of dynamical effects, the chemical heating and CO2 cooling jointly contribute for the occurrence of day and night MILs.

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Mesospheric energy loss rates by OH and O<sub>2</sub> emissions at 23<sup>°</sup>S

Abstract: Abstract. The nightglow OH (9, 4)

Cited by 3 publications

References 21 publications

Development of Optical Mesosphere Thermosphere Imagers (OMTI)

Development of Optical Mesosphere Thermosphere Imagers (OMTI)

A new perspective on the molecular oxygen and hydroxyl airglow emissions

A chemical perspective of day and night tropical (10°N–15°N) mesospheric inversion layers

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